Radio-News-1922-03-R

Home , Telephone newspaper, The Last Station

CIRCULATION \ 25 Cents March u. 1 9 22 Over 125 Illustrations \\ \\-\k; , Edited by H.GERNSBACK

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CIRCULATION LARGER THAN ALL OTHER RADIO MAGAZINES COMBINED \\\\

www.americanradiohistory.com UNNINGHAM VACUUM CUNNINGHAM - C-300 GAS CONTENT DETECTOR TUBES For HOME RECEIVING SETS

TEROUGHOUT the entire country today Cunningham Type C -300 Amplifies Gas Content Detector Tube is recognized as the ideal tube for use :n Home Receiving Sets. For clear reception of Concerts, Market Reports, Stock Quotations, etc., as it sent out by radio, this tube cannot be excelled. Detects The one tube_ which gives the best results used with any type i eceiving set applicable to wave lengths of 100 and 3000 meters for both spark and C. `V. Telegraph and Telephone, this "Cunningham Detector Tube is being purchased everywhere by those operating Home Receiving Sets. In addition to its remarkable detector properties, low B. battery, quietness in operation, it is a free and persistent oscillator for regenerative amplification and C. W. reception and functions without distortion of the received signals. Many wonderful tributes have been paid this tube by those who have The trade mark GE is the ruaranIce of these achieved the remarkable results that it always gives. quality tubes. Each Your nearest dealer will tube is hut to most gladly give you full information about this tube rigid speciheatbons. or writs direct to us.

Trading as AUDIOTRON MFG. COMPANY 248 First Street 154 West Lake Street San Francisco, Calif. Chicago. Illinois

www.americanradiohistory.com Radio News for March, 1922 793 Frost -Radio Improved

High gracie electric,] in- N ickel- Three th sulations. Will silver I'tire silver ness washers, r withstand 110 contact contact nickel plated volt breakdown test. springs. points. and buff d. JACKS and PLUG Specially Designed for 1 1_ Radio Panel Work

INTERCHANGEABLE WITH OTHER STANDARD MAKES T "Spread" arrangement Small, neat frame Hexagon of spring terminals. round e, gr. highly hi ailed Cuts are actual size allowing twice the I el'slue , nickel usual amount of plated and huffed. nir tele] space for soldering. and b tffe. 1.

The smallest, neatest, most perfectly finished No. 132. Plug only, $1.00 jacks and plugs that have ever been offered to the Radio trade. They have been specially designed for panel work and are of standardized construction so as to be interchangeable with other standard makes. A particularly desirable and exclusive feature of the FROST -RADIO Jack is the "spread" arrangement of the spring terminals No. 133. Jack only, $ .65 which allows twice the usual amount of space for soldering to the wiring. These terminals 1®Ñh are heavily tinned. Another striking feature is the nickel plated 11M111 and highly buffed finish used throughout. Sturdy construction, perfect spring adjustment, gripping contact of springs on tip and No. 134. Jack only, $ .75 sleeve of plug. Packed in individual containers. >101111m IMEN111111 Dealer IO11111111!OIIk Two -color wall posters now ready for 11111111111111 /'\ distribution. IB WE ARE NOW IN QUANTITY PRO- DUCTION AND ARE MAKING IMMEDI- No. 131. Jack only, $ .90 ATE DELIVERIES. Attractive Discounts to Distributors and Dealers. Write or wire for proposition and samples.

I HERBERT H. FROST No. 135. Jack only, $1.00

154 W. Lake Street ..I., .,t.. Chicago, Ill. If®Ili:

No. 136. Jack only, $1.25

www.americanradiohistory.com CONTENTS VOL 3 OR MARCH

PAGE PAGE Editorial By H. Gernsback 80t The Development of the Transmitter, By John S. Armstrong 816 The Navy Radio School at Great Lakes, By S. R. Winters 8o2 How to Sell Ten Million Radio Outfits, By Stanley B. Jones 817 A Sea -Plane High Power Bulb Trans- mitter By Jesse Marsten 804 Importent New Radio Legislation, By H. Gernsback 818 A German Trench Radio Set, By Charles R. Leutz 8o5 An Efficient Remote Control System, By Alfred Clark and H. D. Mabry 819 Portable Sets Prove Most Useful Dur- ing Army Manceuvres.By S. R. Winters 8o5 The Relay Antenna Transfer Switch, By Louis Gerard Pacent 820 Radio Transmitters Amateurs Have Over- looked By Edward T. Bicak 8o6 Soon By H. Gernsback 822 Notes on High Power Quenched Spark Storage Batteries for the Plate Circuit, Sets By Charles R. Leutz 8o8 By Chas. K. Fulghum 823 The Hall Air Jet Relay for Recording The Newspaper of Tomorrow, Radio Signals 8o9 By J. Farrell 823 $350 Detector Amplifier Prize Contest 8:o How to Make a Radiophone Receiving A Transmitting Tube is a Good Amplifier, Set By Arthur H. Lynch 82.4 By H. Metcalf 8 :o Real Sport Playing Games by Wireless, Tubes and Transformers in Cascade, By Theron Bebeau 825 F. Bront 8.1 By John There's Nothing Too Good for the Man A Radio System for Simultaneous Send- With Brains By Armand C. Ross 826 ing and Receiving, The Ordeal By Erald A. Schivo By Louis Gerard Pacent 8.2 827 With the Amateurs 828 A Method of Recording Wireless Signals by Means of a Morse Inker, Who's Who in Radio -Roy A. Weagant. S31 By Capt. H. de A. Donisthorpe 8 =3 plum s mmmlmmin Splitting the Game.. By Howard S. Pyle 831 What Anyone Can Hear, By Armstrong Perry 814 I- Want -To -Know 832 Note on Oscillations of a Two -Element Radio Digest 833 Valve ... By Jesse Marsten 815 Correspondence from Readers 834 Increasing the Output of a Rectifier, By Max Levy 81,5 Club Gossip 835

® included. All accepted contributions are paid for R A D I O N E W S is published on the 25th of each month at on publicati A New York. There are 12 numbers per year. Subsdrip- special rate is paid for novel experiments; good photographs accompanying 2233 Fulton Street, highly desirable. is $2.50 a year in U. S. and possessions. Ganada and foreign them are tioz price (no countries, $2.75 a year. U. S. coin as well as U. S. Eltamps accepted R A D I O NEW S. Monthly. Entered as second -class mrtter Rune single copies, 25 cents each. A sample copy will 8th, 1919, at the Post Office at New York, N. Y., foreign coins or stamps). to under the Act of to sent gratis on request. Checks and money orders should be drawn March 3, 1897, Title registered U. S. Patent Office. Copyright, 1921, by PUBLIS' ING CO, ENC. If you should E. P. Co., Inc., New York. The Experimenter Publishing order of EXPERIMENTER not mis- C'o., 233 Fulton change your address notify us promptly, in order that copies be Street, N. Y., N. Y. The Contents of this magazine are copyrighted and carried or lost. No copies sent after expiration. must not be reproduced without giving full credit to the publica -ion. and contributions to this journal should be_orkad- All communications ldw RADIO NEWS is for sale at all newsstands in the United dressed to Editor, RADIO NEWS, 233 Fulton States and Canada; also at Brentano's, 37 Avenue de l'Opera, cannot be returned unless full postage has been Palis. Unaccepted contributions 233 Fulton Street, New York City Published by EXPERIMENTER PUBLISHING CO., INC., Publishers of Radio News and Science and Invention R. W. DEMOTT, Secretary IL GERNSBAO'X, President S. GERNSBACK, Treasurer ;,\ Z1 t-Q_ n`c , _ /- c ,/j

www.americanradiohistory.com Radio News for March, 1922 795

60A'

Licensed under Armstrong U. S. Patent No. 1,113,149

The Grebe CR-5 Receiver TERRITORIAL DISTRIBUTORS Bunnell & , Co. J. H., New York Pity Pletcher Electric Ch, New York City Manhattan Electrical Supply Co., New York, Chicago, Capitol Radio Supply Co., Indianapolis, Ind. Hickson Electric Co., Inc. Rochester, N. Y. St. Louis. Central Radio Company, Inc., Kansas City, Mo. Commonwealth Hurlhurt Still Electrical Cb., Houston, Texas Northwest Radio Service C'o., Seattle, Wash, Edison Co., Chicago, Ill. Julius Andrae & Sons Co., Milwaukee, Wis. Pacific Telegraph Institute, Spokane, Wash. Continental Radio and Electric ('orp., New York Kelly & Phillips. Brooklyn, N. Y. Philadelphia School of Wireless Telegraphy. Philadel- Detroit Electric Co., Detroit, Mich. Klaus Radio Company, Eureka, Ill. phia, Pa. Doubleday -Hill Electric CO., Pittsburgh, Pa. Leo J. Meyberg Co., San Francisco, Calif. Reynolds Radio Company, Denver, Colo. P. D. Pitts Co., Inc., Boston. Mass. Western Radio Electric Cb., Los Angeles, Calif.

A. H. GREBE & CO., Inc. 72 Van Wyck Blvd., Richmond, Hill, N. Y.

www.americanradiohistory.com 796 Radio News for March, 1922

IUF. HOW TO BUILD THE RADIOTROLA

iTarch - 25 rent:

RADIO CONCERTS IN THE HOME see Page 1041

104 ON ALL PAGES NEWSSTANDS 65 25c The Copy ARTICLES SUBSCRIPTION 195 PER YEAR ILLUSTRATIONS (12 Numbers) 16 $2.50 PAGES (Add 50c outside ROTOGRAVURE U. S.)

EXCLUSIVE RADIO ARTICLES A SPECIAL FEATURE Some of the Radio Articles in the March Issue How to Build a Radiotrola Pancake Coil Mounting Radio Gives Telephone Secrecy Radiophoning to and from "L" Train Sun Dust Bars Radio Radio for the Beginner New Radio Apparatus for Aircraft American Amateurs Heard in Europe

SCIENCE & INVENTION is just chock full of interesting articles and illustrations that appeal to everyone. It will hold your interest from cover to cover because it contains everything new in the field of science, invention and mechanics. Quoted by hundreds of newspapers and magazines all over the world every month. Its editorial contributions constitute the brains of the scientific world. Its four color cover designs are both artistic and attractive

Partial (Corateritz á.orr March, 1922 A COMBINATICN AIRPLANE AND SUBMARINE \VOOI) CARVINGS WITH A POCKET KNIFE POWER FROM THE AIR SHALL I TAKE UP ENGINEERING FORECASTING EARTHQUAKES TALKING OVER A TROLLEY WIRE STEEL WIRE RECORDS I -IEART BEATS MAKING ICE ON A STOVE POPULAR ASTRONOMY -TO THE CENTER OF THE UNI- IRON CAPSULES CHART HUMAN BODY VERSE IN 800,000,000 YEARS WHEN LIGHTNING STRUCK MY HOME THE NINTH SPOOL TILE AMATEUR MAGICIAN EDISON'S SON INVENTS TRENCH DESTROYER FORTUNES FROM LITTLE THINGS, No. 9-Story of the TEN MILLION HORSE -POWER IN A PEBBLE Safety Pin HOUSEHOLD SCIENCE MOTOR HINTS- $50.00 PRIZE CONTEST HOW GAS TURBINES \YORK SYNURA GIVES OILY TASTE TO DRINKING WATER STARTING AUTOS IN COLD WEATHER WINNERS OF THE "SKIPPING BOAT" CONTEST SNOW CRYSTALS

iGentlemen` Please enter my subscription for Science and Invention. I for the term of one year for which I enclose herewith Experimenter Publishing Company I $2.50 (add 50c for postage outside of United States.) I

IName Town 1 New York 231 Fulton Street I Address tatc -J

www.americanradiohistory.com Radio News for March, 1921 797

for better C W Transmission all dcsijncdfor Iiadiolron Vacuum Abe Operation

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Faradon UC -1803 Faradon UC -1831 Faradon UC -1014 For use as blocking or coupling con- Variable Type For use as a key condenser, grid leak denser in CW radio telegraph and Essential for tuning of CW trans- condenser, or radio frequency by- telephone circuits. Lowest loss of any mitters. as a series pass condenser in circuits utilizing and is the Designed antenna condenser on the market condenser and will stand five amperes Radiotrons UV -202 or UV -203. It is only compact and satisfactory unit fitted with mounting tabs on back. of its kind available for CW work of CW and its maximum capacity today. Positively necessary to prevent setting. Will vary your radiated wave Has a capacity of .002 MFD. and is "swinging" of CW telegraph signals. length by 50 to 100 meters. Mini- rated at 3000 volts. Will carry two Has a capacity of .000025 MFD, and mum .0001 MFD, maximum .0012 amperes at a 200 meter maximum is rated at 10,000 volts. MFD. Rated at 4000 volts. setting. Price, $5.00 Price, $9.00 Price, $2.50 OTHER FARADONS Model UC -1015 Model UC -1806 Series antenna condenser and intermediate CW circuit Suitable as a grid condenser in higher power Radiotron condenser utilizing Radiotrons UV -202 and UV -203. transmission. Also for insertion across plate transformer Three capacities possible with each unit; .0005, .0004, in sets where high potential surges follow key transmission. .0003, at 7500 volts effective. Has a capacity of .002 MFD, and is rated at 6000 volts. Price, $5.75 Price, $7.00 NOTE: These two models are similar in appearance to UC-1014 And a complete line of Filter Condensers for use in Kenotron Rectification Send 25 cents for the RCA catalog containing full information on CW operation, then consult your nearest dealer, or Sales Division Suite 1802 Ra dioxó oCorporation of America 233 Broadway, New York City

www.americanradiohistory.com 798 Radio News for March, 1922

The Aeriola Jr. The Aeriola Sr. As from a Phonograph The quickest, easiest way of Like the Aeriola Jr. the Aeriola Sr. The whole family can now listen learning radio reception - both is designed to meet the require- to broadcasted concerts, news, telephony and telegraphy -is by ments of novices and beginners sermons and lectures with the means of the Aeriola Jr. Once in- who have no technical knowledge Vocarola. The music and the stalled, only two adjustments are of radio, but who wish to "listen words come out of a horn, just required. The set is complete in in" and enjoy broadcasted music, as they do from a phonograph. itself and includes a variable sporting news, speeches, etc. It Any member of the family can tuner, a fixed condenser, a super- has a longer range than Aeriola Jr. operate it. The Vocarola consists sensitive crystal detector and It has features found only in more simply of a horn which is head -telephones, and antenna out- expensive apparatus, such as the mounted on the wall or any other fit. Full instructions for installing Armstrong regenerative circuit to suitable place and which contains and operating are provided. The increase the strength of reception, a special, loud- speaking receiver Aeriola Jr. is good for receiving and a vacuum tube detector. The unit capable of reproducing music broadcasted signals, music, set includes also a pair of head - and speech without distortion. It speeches, etc. from nearby sta- telephones, a filament and a plate is connected, in the regular man- tions. It can be tuned within a dry battery, and antenna outfit. ner, with the amplifier of the range of 190 to 500 meters wave- Full instructions for installing and radio set by means of a cord, . length. Price $32.50. operating are sent with the set. which has only to be plugged in. Price $75. Price $30.

Any Novice Can Do It Radio is now within the reach of everybody. hundreds who own receiving sets. The ether is No longer is it necessary to be an expert. The radio literally alive, these days, with songs of great artists, telephone receiving set is as simple as the phono- the voices of great orators and preachers, the news graph. Plug in a telephone jack, turn a tuning of the great events on which the destinies of nations knob, and anybody can listen to concert music, hang. And, most wonderful of all, the ether can be speeches, lectures, news and sermons broadcasted tapped by anybody, with the receiving sets described by one of the many stations that now make it a daily and illustrated on these two pages. and nightly business to entertain and instruct

Amateurs-Buy Our "C W" Instruction Book cet Your Dealer, 25 Cents

lo oR f Corporation ;;r America Sales Division, Suite 1802 of 233 Broadway, New York City

www.americanradiohistory.com Radio News for March, 1922 799 Now "Listen Iri'

Type R A Short -Wave Type D A Tube Detector and Type R C Short -Wave Regenerative Tuner Two -Stage Amplifier Regenerative Receiver Most novices begin with crystal This unit enables the novice to This receiver combines in one detection and later use vacuum pass from crystal to tube detec- cabinet Type RA Short -Wave tubes. With this unit they can tion easily and naturally. It gives Regenerative Tuner and Type changefrom crystalsto tubes. Only him a vacuum tube detector and DA Detector and Two -Stage Am- one adjustment is required to tune two stages of audio frequency plifier, described elsewhere on this in the desired signal. The device amplification. Filaments are con - page. Hence it meets the require- responds to any wave length be- trolled by two rheostats, one of ments of the amateur or broad- tween 180 and 700 meters simply which regulates the current to the casting enthusiast who wants a by turning a knob. An adjustable detector tube and the other the modern, compact, portable, effici- tickler coil permits the use of re- current to the two amplifying ent receiver which will enable generative amplification with a tubes. Signals may be received him to hear distant stations. This vacuum tube detector unit (Type either without amplification, with is an ideal instrument for use with DA). This tuner can also be used one stage, or with two stages of the loud- speaking Vocarola. Mes- with Type DB Crystal Detector. amplification merely by inserting sages may be received with the Hence the novice can begin with a telephone plug in the proper detector alone or with one or two crystal detection and later use jack. The unit should be used stage amplification. Used with a tubes and amplifiers with this with Radiotrons UV -200 as a de- load -coil (Type CB) signals can be unit. A fine tuning adjustment is tector and UV -201 as amplifiers, received on wave lengths up to provided by a single -plate con- although UV -201 may be used 1,600 or 2,800 meters, depending denser for tuning in "CW" sta- throughout. Price (less Radiotron on the antenna. Price (less Radio - tions, or for receiving broadcasted tubes and telephone plug) $68. tron tubes) $125. Type CB Load - music, news, etc. Price $65. Coil can be supplied for $5.

There's News and Music in the Air Some of the sets like the Aeriola Jr. and the a few hours' experience. By connecting a Vocarola Aeriola Sr. are so simple that even one who has no loudspeaker with the more efficient sets shown knowledge of electricity whatever can set them the whole family can "listen in." up and "listen in" to the messages and music sent Radio telephone broadcasting now takes its place by broadcasting stations or by enthusiastic radio in the home as a permanent means of family enter- amateurs. Other, more sensitive sets, described tainment and the entertainment costs practically and illustrated on this page, can be operated after nothing after the apparatus has been installed.

Dealers- For Quick Turnover Handle the R C A Line Radio ZÇorporation of America Sales Division, Suite ] 802 233 Broadway, New York City

www.americanradiohistory.com Boo Radio News for March, 1922 ANNOUNCEMENT The New EDISON Radio Battery for Tube Circuits Permanent, Dependable, Noiseless

The Army and Navy use thousands of Edison Batteries of higher - voltage and small ampere hour capacity designed by Mr. Edison especially for the plate circuit.

Dependability, noiselessness and long life, among the many exclusive advantages proved so conclusively by Edison Storage Batteries in actual service, lead Mr. Edison to design a special radio cell, for vacuum tube work in plate circuits, suitable for operators and experimenters who demand the best radio equipment obtainable.

Typical assembly of the new Edison The Edison Radio Cell is built of steel -steel grids, steel poles and a Radio Battery -nine twin cells -22V steel container. The active materials, nickel hydrate and iron oxide, volts, 2 ampere hours, complete, are held securely in perforated steel tubes and pockets. The electrolyte ready for service is an alkaline solution that preserves steel.

Advantages of the Edison Radio Battery It is stronger and has a longer life than any other make of storage or dry cell. PRICES It is clean and gives of no noxious fumes. It requires little attention. Obviously, from its principle and construction, there can be no sulphation.,_ The new Edison Radio Battery can sedimentation, corrosion of terminals or separator troubles. be obtained for any desired voltage. There is nothing about it to "buckle" or crack. It can be completely discharged without injury. Twin cell units, each $ 2.50 It can be put on charge at any time regardless of how little or how much of previous charge has been used. 9 twin cells (aa% volts) ... 22.5o Tray 1.50 It can be taken off charge at any time and used, whether fully charged or not. - zz% volt battery, complete $24.00 Because it can be left standing idle in any condition of charge, or discharge, you can charge it at your convenience. volt battery, complete....$48.00 45 If charged when polarity is accidentally reversed; or if accidentally short -- circuited, it is not injured. Prices on trays for other assemblies quoted on request THE EDISON RADIO CELL OPERATES SILENTLY. There is no "frying" or other noises to interrupt when receiving. All prices, f.o.b. Orange, N. J. At the rate generally used, the voltage curve is flat. The terminals are exposed and convenient for "tapping in" to secure any desired voltage within the range of the battery. PERMANENCY, DEPENDABLENESS, NOISELESSNESS, LONG LIFE and LOW OPERATING COST enables the Edison Radio Cell to be classed as an investment and not a continual source of expense. To those - who demand the best radio equipment, the Edison Radio Cell gives satisfaction.

Edison Storage Battery Company Department B ORANGE, NEW JERSEY

www.americanradiohistory.com DIO NE% H. GERNSBACK -Editor ROBERT E. LACAULT -Associate Editor

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Vol. 3 MARCH, 1922 No. 9

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:::::,:iiiiiiim:::::::::i:iiiii:::::::U::i,,.,, ,iiiiii,,,,,,,,,,,,,,,,,,,ium :. Boom Times in Radio HE situation in radio for which every ardent well - Instruments that will stand up, than make sales that will be wisher of the art has been longing, seems to have a detriment to them later on. arrived at last. The other dangerous condition that has sprung up lately Due to the activities of the various broadcasting is the ill -famed stock selling scheme. A manufacturer will stations throughout the country -there are now al- get up a sample of a home radio outfit that looks like a -most 8o such stations -the public, as we all know, has Victrola, and run a full page advertisement of it in the become an enthusiastic supporter of our great art. daily papers. He has not a single outfit to sell, nor has he a But even the boldest prophet in radio, and the most plant in which to make them. Due to the boom conditions he .ardent well wisher certainly never foresaw any such condi- will get many orders for future delivery, and he will show tion as has existed for the past few months and exists these orders to his victims as a proof that his venture is a right now. The only parallel to the radio business at the tremendously profitable one. He will get out circulars and present time is the recent rush to the Texas oil fields, or begin selling sock, as has been done in the past, to the detri- the boom times of the motion picture industry some years ment of the entire radio art. z'-go. When radio was young, several large concerns, as will When the entire country is in the throes of depression, be remembered, sold stock indiscriminately to the tune of and with nearly every other industry, that one can name, many millions of dollars, out of which the public was de- running part time or else is at an entire standstill, the radio frauded. Due to this, the public for many years was wary business is the young giant, that will soon rival such great of anything with the word "wireless" attached to it; as a industries as the automobile business -and this is not an result the entire radio business suffered proportionately. It idle prophecy. is to be hoped that such business methods will be exposed The entire radio industry was caught unprepared when as quickly as they spring up, as the radio business cannot the rush started last December. No one had foreseen such now afford such dishonest methods. a thing, or thought such a condition could be possible. Peo- The question which the writer is most often asked today ple stormed stores in their effort to buy radio apparatus, is, how long will the boom last? When will the storm of and anything from a ten dollar outfit to a two hundred dol- prosperity blow over, leaving everyone prostrate with huge lar one, found, and is finding, sales, just as rapidly as the stocks on his hands ? material can be delivered. It is our opinion that the present conditions will last for During a single week, the writer has had on his desk at least another year and that the radio business will be a correspondence, circulars, special letters and telegrams very healthy one for several years to come. There will which show that over five million dollars of new capital probably be the usual summer slack -although much less went into the radio business for the period of a single week. pronounced -and then a great rush for the fall and winter. Every manufacturer is working at capacity day and night, The one thing regarding which we would caution dealers trying to keep pace with the demand, and the more he turns and jobbers is to be careful and not over -buy. Indications out, the more he falls back. It makes no difference what are that within the next six months there will be enough he makes -whether it is a knob, a dial, a detector or one apparatus to go around. Tremendous efforts are being made of the expensive outfits -all find ready sale and overtax by manufacturers to meet the situation, and with all the new the capacity of every maker. capital being poured into the business, we estimate that The public seemingly does not care what it buys or what within six months at the most the supply will exceed the the price is, and, as in any boom, it may be imagined that demand. In other words, everyone, unless he buys carefully, prices on radio goods are by no means low. In other words, will be overstocked, and the usual hardships will follow. the manufacturers and dealers are exacting top price. This not only holds true for the dealer who will find him- This condition is a natural one, when people are storm- self loaded with material on his shelves that he cannot move ing the stores and are lining up behind the showcases six rapidly, but for the small manufacturer as well, who will deep, and very often breaking the showcases in the bargain. have all his money tied up in merchandise for which the All these are bare facts, but we are far from saying that sale is not as brisk. kind such a condition is a healthy one. A situation of this We will then witness the next cycle : price cutting, when is the worst that can be imagined, for many reasons. In real competition will begin in earnest. This condition, the first place, it makes for loose manufacturing methods. however, is at least six months distant, and perhaps a little Some of the manufacturers who have not been in the game further. It is due to come, however, at any time, for some very long do not care what sort of material they turn out. of the supplies. Inspection is apt to be lax, and many a layman who starts in general that But as mentioned before, the radio business in the radio field to -day is disappointed, for the reason to come, and those who can radio should be brisk for some time he cannot get results. Such a man will give the entire read the future best, will no doubt reap the harvest. business a black eye, and we would impress upon all manufacturers to rather curtail their sales and turn out workable H. GERNSBACK.

www.americanradiohistory.com 2 Radio News for March, 1922 The Navy Radio School at great lakes By S. R. WINTERS

SUPPOSE a objective toward philan th rop- which the student ist tendered labors during the you the op- first week of en- portunity of rollment in the learning a trade or preliminary school. profession while T h e information traveling and reim- relative to the sys- bursed you with a tem of dots and reasonable salary dash es is aug- for taking advan- mented and enliv- tage of the offer- ened by lectures on and without pen- the opportunities alizing your fu- beckoning the t tt r e. I daresay trained operator in there would be no the service of the hesitancy in ac- Navy Department cepting the privi- once he has mas- lege. Analogous to tered the art. The this supposition is rudiments of wire- the recruiting invi- less transmission tation of the are broached by United States the simplest ways Navy .Department of instruction, in- whose acceptance volving explana- affords avenues of tion of magnetism travel and study, in its crude form, payment of a such as lectures on monthly stipend, the lodestone, board, lodging, and horseshoe magnet, medical services. bar magnet, poles Such are America's of a magnet and floating colleges the earth's magnet- wherein a fighting i s m. Instructors craft may be trans- Above, Are Shown the Power Control, and the Operating Room of a U. S. Navy Station Where "Gobs" Are Trained to Become Operators Aboard the Ships of Uncle Sam's Fleet. Below is a General View who saw service at formed into a of One of the Large Stations of the Atlantic Coast Operated by the Navy. sea during the re- schoolroom. cent world conflict No, this article are usually as- is not an attempt to boost enlistment fig- ever, bears to radio instruction a relation signed in the dissemination of this rudi- ures in the Navy. The poster representing similar to that of the college in academic mentary knowledge. Having mastered the Uncle Sam, with his stern and unerring education. It is here that the student com- Continental code during the second week, finger, addressing the multitudes from the pletes a well- balanced course, and if not pairs of telephones are allotted to the street corner, "Your Country Needs You," awarded a diploma, receives the stamp of "gobs" and knowledge by experience be- was striking enough to induce alt adequate approval which is a token subscribing to gins. The signals heard simulate actual force of young men to visit one of the 52 his qualifications for entry either into naval sounds of a radio transmitter, they being navy recruiting stations distributed through- or civilian service as a wireless operator. dispatched by a trained operator. Lec- out the United States. Nor, is this even a The radio preparatory schools of the United tures supplement the regular class room feeble effort to describe the variety of trades States Navy Department are four in num- exercises, the subjects of the lecturers be- and professions which can be learned at her, and are located at Newport, Rhode ing electrons, the electron theory, the elec- sea. Without continuing the introductory Island ; Hampton Roads, Virginia; San troscope and other electrical gears. Mean- paragraphs, I may claim for this exposi- Francisco, California, and Great Lakes, Illi- while, the potential wireless "bug" may be tion an attempt to narrate the details of nois. The last station maintains a pre- told how he may achieve any aspirations Uncle Sam's system of operating schools liminary school as well as the graduate of becoming a petty officer, informed as to for the inculcation of lessons in wireless school for radio instruction. The training the methods of pay and accounts, and even communication. Reference is made espe- in the first principles of the transmission how to transfer his pay-check to folks back cially to the radio training school at Great of messages by electric waves through home. Lakes, Illinois, where during the week end- space embraces a period of eight weeks, Instruction by analogy is the favorite ing July 9, 1921, 755 students were en- after which the students are transferred to method. The commonplace things of the rolled for a complete course in wireless Great Lakes for a continuation of this street, office or home are translated into telephony and telegraphy. form of instruction for thirty -two weeks. terms by way of explaining the phenomena The training station at Great Lakes. how- Knowledge of the Continental Code is the of electrical transmission. The pendulum

www.americanradiohistory.com 803 Radio News for !Ml arch, 1922 of a clock, when svv nginÜ freely and then permitted to hah gradually, is likened to the motion of the oscillary discharge of an electrostatic accumulator in a closed circuit. These fundamentals are firmly fixed in the mind of the pupil before real problems of electric transmission are attacked. The subjects of electric current, electromotive force, the simple coil, storage cells in series and parallel, are introduced to the student the third week following his en- rollment. A review of the history and customs of the Navy -ranging from information of a first -class battle cruiser to a submarine-may be edged in as instruction foreign to radio transmission and yet valuable to bluejackets who apply their wireless knowledge at sea. The fourth reek of instruction finds the aspiring operator receiving signals at the rate of from eight to twelve words a minute. Mean- time the instruction on theoretical wireless currents has progressed through the varying stages of condensers, inductance, and transformers of different types. In the parlance of the street, you can well imagine the "gob" inquiring, "Where do we go from here ?" Forthwith, whether he is from Missouri or not, his vision is directed toward the largest training station of its kind in the world-at Great Lakes, Ill. Here the world is reproduced in minia- One of the Navy Stations on the Southern Coast of the Atlantic, Erected in a Beautiful Corner of ture, athletics, entertainments, welfare the Gulf. quarters, and chaplains of every religious denomination, are supported. The sterner radio power circuits, practical laboratory, globe- trotting errands, as Uncle Sam's ships things of life -for instance, the pursuit of oscillatory circuits, damped wave transmit- literally ply the seven seas of the world. a diploma in recognition of having com- ting sets, undamped wave transmitters, ra- Other than the numerous stations dotting pleted a well- balanced course in wireless dio regulations, vacuum tubes, receiving the Atlantic and Pacific Oceans, the Navy communication -are deprived of some of apparatus, practical receiving, high fre- Department owns and operates stations in their monotony by f requent opportunities quency measurements, practical laboratory, Alaska, Isthmian Canal Zone, Cuba, the for amusements. The day is not to be portable telephony, radio compass, auxili- Virgin Islands, Porto Rico, Hawaiian prolonged with sports, however, for thirty - ary station equipment, main station equip- Islands, the Philippines and China. Grad- two weeks are crowded with lessons offered ment, main station operation, final exami- uation from the training school at Great by a radio curriculum. Seven clays are al- nations. A course in radio telephone.' may Lakes qualifies one to venture into commer- lotted to each subject, with the final ex- be substituted for a corresponding week cial projects involving a knowledge of elec- aminations consuming as many days. The in the main course, the outline of instruc- trical wiring, electrical repairing, power outline of the course in its logical order tion being: General electricity. tube theory, station engineering, storage battery plant, follows: circuits, operation, trouhles, review and ex, automobile lighting, ignition and starting; Magnetism and electromagnetism, static amination. gas engine operation, telegraphy, radio tele- and current electricity, generators, motors, A student graduates from the Great phony, wire telephony, and radio inspec- primary and secondary batteries, internal Lake training station as either a third or tion. combustion engines, practical laboratory, second class electrician (radio) and is Or, the Navy Department being in a po- alternating current and A. C. machinery, transferred to a shore station or to a navy sition to retain a constantly increasing measuring instruments and measurements, vessel for duty. Service may involve number of its own graduates for service at sea, students can pursue the course with assurance of jobs, as the World War considerably accentuated the use of radio telephony and telegraphy as a useful vehicle of the Navy Department.

Radiophone in Banks By Bert A. Teeters Advertising value cf radio telephony has been recognized by the City National Bank, of Dayton, Ohio, which plans to erect a station in Dayton within the next few weeks, according to an announcement made by President Harry Darst. It is believed this will be the first bank -owned radio station in the country. Mr. Darst declares that regular programs will be given, of a financial nature, or course. It is planned to broadcast financial advice, give quotations on local bond and stock issues, send out warnings of activities of bogus promoters, in brief, to be of every aid in a financial way to the recipients of the messages. Talks will be given on any special subject by officers of the bank upon request of a group of receiving stations, Mr. Darst said. Outcome of the experiment is being watched with interest by financial men in see in plan the first step in of Ohio who the A Well Planned Station in Which All the Controls Are Within Reach of the Operator. In Front making Americans a more economical and Him Are the Quenched Gap and the Wave Changer Switch, While Behind is the Power Control Panel, Note the Receiver on the Table. thrifty race.

www.americanradiohistory.com 804 Radio News for March, 1922 A Sea -Plane High Power Bulb Transmjffer* By JESSE MARSTEN

length. The proper wave -length is indicated' 1,1111111111111111111111111111111111 by a small wavemeter lamp seen in the front view photograph, Fig. 3, marked. Fig. 3. "WAVE INDICATOR," which lights up View of the most brilliantly when complete out- the antenna wave- fit for sea length coincides with the wavemeter set- plane. This ting. V.T. trans- A high degree of modulation is obtained. mitter using in two 250 -watt this set by using a so- called "modulation. tubes may be amplifier." In order to secure complete- used for tele- modulation the speech or buzzer voltage ap- phony or plied to telegraphy. the modulator grid must have a: certain minimum value. This value will not be ,,,,i1113::111,,,11iiii,,,,,1111 obtained unless the output voltage of the - microphone transformer is amplified; and for this purpose a modulation amplifier is, employed in a circuit as shown in Fig. 2. IN the September, 1921, issue of the This provides a much more flexible arrange- The modulation amplifier is supplied with' RADIO NEWS the writer described a Fly- ment than conductive coupling, since it per- voltage through an audio ing frequency choke - Boat Bulb Transmitter built by a mits of varying the coupling to meet vari- coil and limiting resistance seen in the Radio manufacturing company. able in il- What conditions. For example, va'riations lustration. The speech or buzzer voltage is. might be called the twin to this set was antenna capacity can be compensated for stepped up by the microphone transformer- built by an Eastern company, and and this voltage is applied to the grid of as a comparison of these two sets the amplifier. The amplified voltage - will be very instructive in showing repeated in the plate circuit of the - differences in circuits and design, it modulation amplifier is is then applied' the object of this article to describe to the grid of the the latter outfit. This large Pliotron set is the type modulator tube, as marked in Figs. CG 1130 transmitter and is illus- I and 2. This entire trated in the accompanying photo- modulation amplifier is contained in a small, com- graphs. pact cabinet unit shown at the right - The points of similarity will first of Fig. 3. be considered. The conditions which Fig. 3, the front view of the set, . this type CG set was to meet are shows clearly identical with those of the other set. the various controls. and parts. The It was to be used on the same type high voltage plate - of flying boat having two antennae, motor generator unit is seen at the. an emergency antenna on which boo left on top of which is mounted the meters was to be transmitted, the generator protective condenser whose other the regular antenna on which capacity is about o.2 microfarads. 1,600 meters was to be transmitted. The microphone is seen right next ta Three types of transmission were the set; this microphone is specially here also to be used : (I) C.W., (2) designed to exclude engine and vibra- Buzzer modulated telegraphy, and tion noises. To the right of the (3) Telephone. main cabinet will be seen the trans- The set employs two Pliotrons, one mitting key and the modulation am- for oscillating, the other for modu- plifier cabinet. lating, the plate voltage on each being On the right side of the main panel 1,500 volts. The plate voltage is are mounted the meters and secured from a controls motor generator, seen for the Pliotron filaments. An in Fig. 3, driven by a 24 -volt storage Back View of the Transmitter Panel, Note the Two Sets of am- battery, Inductances Used for Different Wave -Lengths. meter is included in each filament cir- which at the same time sup- cuit, enabling simultaneous reading of plies filament power. filament The currents in both oscillator circuit design of this set differs con- by varying the plate- antenna coupling, which and modulator. On the right, at the bottom siderably from the previously described out- is not possible with conductive coupling is mounted the rheostat controlling the fila- fit. A schematic wiring diagram of this where the taps are fixed. In series with the ment circuit is shown in currents. To the left of the filament Fig. 1, where it will be grid coil will be seen a condenser shunted rheostat seen that the plate and grid are inductively by both a switch and key. The key is used will be seen the plate circuit am- coupled to each other and to the antenna. for telegraphy, the switch being open. For meter and antenna ammeter. The plate telephony the switch is closed, ammeter reads the sum of both oscillator thus securing uninterrupted os- and modulator currents. In the center of cillations. the panel and above the plate and antenna High efficiency is secured in ammeters will be seen the telephone type of this set by employing two sepa- wave- change switch. When thrown to the rate coil systems, one for each bottom, the set radiates on 600 wave -length. meters; on This avoids short top it radiates on meters. circuiting ends, and absorption I,600 Above this iwave- change switch is of energy by hanging on ends. the antenna send - These two coil systems are seen (Continued on page 858) in the rear view photograph, Fig. 4. The upper coil system is the 600- meter, the lower is the 1,600 -meter system.. The induc- /500V. tive coupling of To Grid of plate, antenna, and /1%dNiG/for í7 grid is continuous- Tc Buzzeror ly variable as seen Speech from the photographs, and in op- News Wage ©e4010 /922 eration this coup- t ling is varied until ©ÁQco,o/kw /.9ZZ F/G./ the ammeter regis- The Transmitting Circuit of the Set Includes Separater Grid, ters a maximum at In the Modulating Circuit for Telephony a Speech Amplifier Plate and Antenna Inductances. the required wave- is Used.

www.americanradiohistory.com 805 Radio News for March, 1922 A German Trench Radio Set By CHARLES R. LEUTZ*

In the left and right side views of this compact portable set may be seen all the organs which have been carefully designed so as to take a minimum of space. This set is fitted with a quenched gap and a special double action vibrator furnishing A. C. Below is a view of the set in its box.

190 meters of radio equip- circuit to give a wave -length of THIS unusual piece used. The inductance ment has so many unique and orig- with the inductance in- was a copper wire of square cross section, inal features that it will be of pro- com- heavily silver plated. A switch was terest to even the novice. The used to shown in the fol- vided to increase the inductance plete equipment, as- 210 meters. The weighs approximately change the wave- length to lowing photographs, quenched gap consisted of three heavily siI- I5 pounds and can be readily carried on the The only additional ver plated, copper discs, separated with thin back of a soldier. mica gaskets, the sparking being in air. equipment required is a storage battery and with a the antenna material. The standard an- The antenna circuit was tuned tenna was only 25' long and 4' high, so the variometer wound with heavy Litzendraht could be carried by one and resonance indicated by a small lamp. entire equipment was not used man, if necessary. The purpose of the sta- The reason a meter on communications between was primarily so that resonance could tion is to carry and also because the trenches and other military groups h -- be indicated at night hind the lines, in both directions. meters are fragile. All the component in a weather -proof To reduce the physical dimensions and parts are contained the smallest possible size and potential taken from the sec- box and the control handles external. weight to battery. The shows the full lightness, some of the individual parts are ondary of the buzzer was approximately Referring to Fig. I which and receiving. current and practi- view, the window at the upper left hand used for both transmitting 7,000 volts alternating indicat- First considering the transmitter, this con- cally in the form of a pure sine wave. The corner is in front of the resonance of a special two -way buzzer that mica condenser across the secondary was in ing lamp. In the right hand upper corner sisted has po- handled 5o watts at 12 volts from a storage two sections, the resultant capacity being is the control switch which four one sitions : I. Send (Senden) ; 2. Receive WirelessTele- correct for resonant conditions and *Formerly Engineer, Marconi of the oscillatory (Continued on page 854) g,apin Co. section only used as part Portable Sets Prove Most Useful During Army Manoeuvres BY S. R. WINTERS opportunity for qualified EFFECTIVE radio com- to enlarge event radio operators munication in the their field of usefulness, Hof future wars was one self - in both in patriotic and of the objectives sought help ways. the recent fall manoeuvres recom- in The criticisms and of 5,0oo marines their mendations of the fall ma- march from Quantico to noeuvres of the Marine Wilderness Run, Virginia, Corps, with reference to when conditions of actual A communication, specify that warfare were simulated. the airdrome shall constant- portable wireless outfit and remain at the rear of the aeroplanes ly the equipment of op e r a t i n g expeditionary with radio apparatus were forces. This practice ob- arrangements which put this tained during the recent form of communication to in mock warfare at Wilder- severe tests in the field, ness Run. It was found the air, and at conventional that communication was not radio stations. good under different con- The manoeuvres at Wil- ditions, and, consequently, in derness Run with reference actual activities a direct Iine to artillery observations de- rec- should be run from the veloped this interesting the by headquarters of expedi- ommendation as offered tionary forces to the air- the Commanding Officer Manoeuvres night officer drome. at "For this duty an in partici- is fa- which aircraft should be used who This Type of Field Set Was Used by the Marines During the Manoeuvres in Virginia pated during the activities miliar with riding in a plane over ground with troops, set (not necessarily a flyer), in America. The to send and receive radio, training along these lines. During the a precedent in mock warfare who is qualified in conjunction with the and who is capable of spotting and decid- manoeuvres enlisted men who were radio aircraft, operating involving the artillery. So operators did this work, but they knew troops on the ground, answered all calls ing on questions night. The of far, I know of no officer with these quali- nothing of spotting or of artillery.' Thus issued both day and absence is that some of the Commanding Officer of the Marine Fly- any casualty indicates the efficiency of the fications. It recommended 856) the officers attached to the artillery be given ing Field at Wilderness Run opens up an (Continued on rage

www.americanradiohistory.com 8o6 Radio News for IlJarch, 1922 Radio Transmitters Amateurs Have Overlooked By EDWARD T. BICAK*

different type of transmitting circuit. If the following will arouse the amateur radio operator to think of possible improvements he can make to his transmitter and stir him to carry out some intelligent experiments, it will have accomplished its purpose. THE SIMPSON TRANSMITTER To begin with, consider the Simpson transmitter. At the mention of this name some amateurs will obviously say, "That's true, it never occurred to me to try out the Simpson circuit on 200 meters." To the great majority, however, the name will be new. It will be new, regrettably, to some very prominent amateur operators. The writer had this brought to his attention on three different occasions recently in inter- views with a prominent Yonkers (N. Y.) amateur, a well -known Pennsylvania radio man, and an advanced radio amateur of Texas. Each of these three men went away very anxious to try out this particular one of the several circuits which has proven satisfactory for commercial radio communication and yet which happens to be one or those that have been overlooked by amateur operators. Permit, here, a preliminary word of caution. The secret of proper operation of Fig. 4. This Cutting and Washington Trans the Simpson transmitter lies in the spark mitter is Equipped With a Special Spark Gap gap. This, however, is Which May be Seen the Front Panel. true of all spark on transmitters. Only with a well designed quenched gap can the Simpson transmitter IN the mind of the average radio ama- be made to function properly. With this teur there exist but two typ_s of radio in mind, refer to Fig. I. Does this not transmitting systems, one of which he appear a very simple method of exciting solemnly chooses and becomes recon- oscillations in the antenna system? But ciled to for life. IIis experimenting wait ! Simplicity is not the only feature. is confined to his chosen system and any at- There are no conditions of high frequency tempt resonance to be Fig. 6. A Commercial Type of Shoemaker to divert his thoughts from the sin- fulfilled in the Simpson Transmitting Set. The Rotary Gap is Enclosed gle track on which they ride, is regarded circuit. This latter feature makes it en- in the Case on the Right. with suspicion. This does not necessarily tirely different from transmitters in which mean that the American radio amateur is two oscillatory circuits must be adjusted to is not difficult to understand. The over- not progressive. Indeed, he is ; but at best resonance for maximum radiation. In the his progress is limited. Simpson transmitter only head wires of the antenna system and the one oscillatory ground are considered One of the two transmitting systems circuit exists and hence it can be very easily as the conducting chosen by the amateur is that adjusted to radiate surfaces of a huge condenser which may be originally a wave of given length. called the patented by Marconi and employing two The oscillatory circuit referred to antenna- ground condenser. In consists series with this condenser is inductance coupled circuits with either rotary or of the overhead wires, inductance coil, con- the quenched gap. is denser, ammeter coil and main high voltage condenser. Dur- spark The other system and ground. All that is ing a Colpitts or Heising arrangement of cir- required is to select the proper the interval that the telegraph key is capacitance depressed the cuits for continuous wave transmission. of the high -voltage condenser or to adjust alternating current from the Chaffee, Thompson, the inductance secondary of the high voltage transformer Simpson, Stone, Shoe- of the circuit at the contact charges this maker, Cutting and Washington have evi- L. A change in either capacitance in- main condenser in the usual or manner. Since, however, main dently preached to deafened ears and their ductance alters the wave- length. The cir- the con- work has been entirely disregarded cuit which includes the denser is in series with the antenna- ground by the spark gap is not condenser, the latter multitudinous radio experimenters and ama- oscillatory and consequently is not adjusted also becomes charged. teur radio operators. it to obtain the usual Then at the instant the difference of po- Does not seem conditions of resonance; tential across the strange to the reader that of several trans- nor is the coupling of the gap and radiating condensers becomes a maximum, the spark gap acts as a mitting systems which have proven satis- circuits critical. The only requirement to trigger factory in commercial be met which and releases the energy which was stored in service, only two affects the former circuit is the antenna have been adopted by the American radio to keep the spark gap connected system in a static form, there- across by converting it into its oscillatory amateur ? It is doubtful whether as many points on the circuit that are at nodal po- form. as a half tential. The number of sections in the spark gap dozen amateur stations in these This can quite easily be found by should vast United States employ a type of trans- experiment. he so selected that the discharge through it is not oscillatory mitter other than one of the two general The operation of the Simpson transmitter in character. types mentioned That is, only one -half of a complete oscil- in the second paragraph. lation should Whatever the various reasons for this con- take place in the gap circuit, dition may be, it is after which the radiating circuit should be certain that the final left free to oscillate analysis would condemn the lack of suf- at its natural fre- ficient publicity given quency. certain transmitting The incorporation systems in the mediums through which the of the Simpson circuit radio amateur obtains his information. in a modern panel transmitter is shown in Fig. 2. Several antenna loading induc- No misinterpretation, please ! It is not the object tances, shown above the panel, are employed of this article.to attack the sys- to obtain the commercial tems of radio communication which the wave -lengths. The amateur quenched gap is shown mounted at the top has so wilfully chosen. On the of the contrary, it is desired to panel, with the wave changing switch consider some of directly below it. the disadvantages as well as the advantages The automatic starter, of meters, rheostats and switches are mounted the other systems which will be de- on the lower half scribed, and the amateur will then be left of the panel. to decide whether he has selected the proper The advantages of this type of transmitter system or whether he should change to a are more numerous- than the disadvantages. It is a perfect model of simplicity; has no `Head of the Department of Radio Engineering, Fig. 3. The Cutting and Washington critical adjustments;- Extension Division, Circuit can be used on short United Y. M. C. A. Schools. Using Impact Excitation. wave -lengths with the long antenna usually

www.americanradiohistory.com Radio News for March, 1922 Su7

inductance forms a- primary circuit of high damping. The extra inductance, capacitance and resistance (RCL) across the main condenser form a so- called concentration circuit, the function of which is to concentrate the spark discharges into regular groups when the supply current is passing through peak values. In other words, the concentration circuit does not permit the discharges to occur irregularly at all times during the alternation. The concentration circuit can hay! a period bet een 1,200 and 1,5oo cycles and is necessary in order to produce a pure and musical note that may be easily copied ©/91I BYRAD /ONCWS =_ at the receiving station. Fig. 5. The Shoemaker Circuit; With This The operation of the Cutting and Wash- Transmitter Using a Synchronous Rotary Gap be as follows: Wave is Radiated. ington system may explained a Very Sharp During the first 6n degrees of an alternation the concentration circuit acts almost as employed for reception, owing to the fact a short circuit across the transformer, and that the main condenser in series with the the condenser C accumulates a charge. In antenna systems shortens the wave-length: the interval between 6o and 12o degrees this and it eliminates the necessity of resonance circuit discharges into the primary con- adjustments. There is this disadvantage, denser in conjunction with the supply cur- however, which may cause the amateur rent. From 120 to 1FO degrees the concen- some trouble. Unless the quenched gap is tration circuit again acts as a partial short of efficient design and is so adjusted that circuit on the line. Each time the potential only one discharge will take place in one difference across the primary condenser be- direction per alternation of the condenser comes sufficient to break down the resistance charging current, the transmitter will not of the quenched gap, it discharges through function as explained and the efficiency of the gap in a single swing or half cycle the set will be detrimentally lowered. which sets the antenna into oscillation. After 0/922 BY RAD/ONEWS THE CUTTING AND WASHINGTON TRANS- the initial excitation of the antenna in any MITTER one period that the transmitting key is de- Fig. 1. The Simpson Transmitting Circuit is One How many amateurs have experimented pressed, successive charging and discharging of the Simplest, Having No Critical Adjustment. with or adopted the Cutting and Washing- of the condenser is aided by the small e.m.t. in circuit while the an- ton transmitting circuit at their stations? induced the primary ing, is about 1.2 microhenries. Either direct Government records give any indication, tenna circuit is oscillating. That is, the at Soo volts or more li sufficient increment or alternating current the answer to this question will be disap- induced e.m.f. adds just may be to the in phase employed charge primary con- pointing. Yet it would seem that a reason- to "trigger" the gap off proper re- current is the antenna os- denser. If direct employed, an able group out of the large army of ama- lation to maintain smoothly iron core inductance should be inserted in teur operators would find something attract- cillations. the supply line. type of transmitter and would Fig. 4 shows a one -half K. \\'. transmitter ive about this discussion. The primary The advantages of this type of transmitter have experimented sufficiently to perfect the of the type under are the very few adjustments required. The wave transmis- condenser in this transmitter has the value circuit for amateur short in- primary inductance, the primary capacitance, sion. The Cutting and Washington trans- of o.lb microfarads while the primary and ductance, a single turn of heavy copper tub- the coupling of the oscillation transmitter operates well on 30o, 450 and 600 former may be fixed. Changes from one meters in commercial practice ; why not on wave- length to another in the amateur range 200 meters? can accordingly be made by simply varying This transmitter differs from ordinary the secondary inductance. Any change of quenched spark transmitters in two re- i5 meters or more, however, requires a va- spects. Of these the first is the multi -spark riation of the primary condenser capaci- system. wherein the high voltage condenser tance to restore the proper ratio between is charged and discharged several times dur- primary and secondary wave- lengths. The ing each alternation of the supply current. chief disadvantage of this transmitting cir- This permits the use of extremely low cuit is that if the primary condenser is voltage in connection with very short spark charged from a 500-volt line or transformer gaps. At the same time it is possible to ob- secondary -and the applied e.m.f. should not tain large output by sparking many times as exceed 500 volts by any great amount - often as the common quenched or single extremely small separations are required at spark system. Any necessity for low f re- the spark gap. Consequently, since no suit- quency resonance in the supply circuit is able spark gap of this type is now on the also obviated, thus making the adjustments amateur apparatus market, it will mean that very few and in no way critical. the experimenter must construct one. in use of The second differentiation is the THE SHOEMAKER TRANSMITTER system. By cmroy- the impact -excitation :\ third type of a primary circuit having high clamping transmitter that has ing failed find a in characteristics in connection with a spark to place amateur radio sta- gap designed to have perfect quenching tions is the Shoemaker "B -1" trorisnatter. properties. only one -half of a complete os- Beyond a doubt this is the most simple to take place in the pr'.- transmitting circuit that has ever complied cillation is allowed with mary circuit. Just as the multi -spark feature the Fourth United States Regulation for audio frequency regarding the use of a sharp wave. It has eliminates the necessity been resonance. so the impact- excitation feature in commercial use for more than two resonance unneces- years and from such reports as the writer makes radio frequency has sary, further reducing in number and sim- been ah!e to obtain, has evidently given plifying the adjustments required. It should satisfactory service he noted, however, that although no reso- It will be remembered that when a plain nance relation exists between the primary or straight gap is connected in series with and secondary circuits. empirical data indi- the antenna and ground, it causes oscilla- cates that it is advantageous to prescre ap- tions set up in the antenna circuit to have damping proximately the ratio of 1.3 to t uetwe, t excessive and a broad wave is con- tit wave -lengths of the primary and sec- sequently radiated. Notwithstanding, ex- ondary circuits. Considerable departure periment has shown that under suitable con- from this ratio may he made. nevertheless, ditions when the plain gap is replaced with without appreciable reduction in efficiency. a synchronous rotary gap and proper ad- As will be observed in Fig. 3, the ar- justment made, the radiated wave will be rangement appears very much like the ordi- sharp -sharp in the sense that the loga- nary quenched spark transmitter with the rithmic decrement will be 0.2 or less. At a excepted addition of the branch circuit RCL. first consideration it may appear that the Fig. f. In This Compact Panel Type Transmit.' circuit constants must be carefully chosen There is this important difference, however, ter the Simpson Circuit is Used. By Means of The main condenser is of large capacitance the Pancake Inductances the Set May be Tuned so as to have values of capacitance and in- and in connection with the single turn of on All Commercial Wave-Lengths. (Continued on page 85o)

www.americanradiohistory.com Radio News for March, 1922 Notes on High Power Quenched Spark Sets BY CHARLES R. LEUTZ*

XX2 Secondary external reactance. XCR Secondary capacity reactance at working frequency. Eo Alternator open circuit voltage at working excitation. II Primary current at working condition. wM,,MMM,,,,M ,.,,,,,,, I2 Secondary current at working condition. Fig, 2. This P quenched Power in watts, primary side at spark set, on working condition. which the The following relations then hold true: tests de- 0.825 it P scribed in this article were ?I = made, is now Eo located in P = 0 385 Eo II Havana, and is operated 2.59 P by the Cuban Eo = government. II 3 XIT = 4 II' /XCR R= / XP V XIT XP 4XCR Io" XC- XC - 3 2irf MFD VERY little practical data has been XM Alternator reactance, which equals XIT = XM XL released on high power quenched synchronous impedance less arma- X2T = XX2 -}- (XX/ + XL) R' spark transmitters, and this paper ture reactance which is small. 2irf CR' XP-/ will deal principally with the im- XXI Primary external reactance. XM = portant and interesting features of XL Leakage reactance of transformer :heir XP correct design. The apparatus that these tests were Aside from ctiiiciency, the most de taken on is now located at Havana sirable feature of a spark ransmitter 73 acid and operated by the Cuban Govern- is stability of note, and maximum ment. Fig. 2 shows btability the main induc- is only obtained when reso- ÌOKWCUR4NSE7 tances of which there nance \ are four. One is obtained in all circuits con ` KWCuAmSel 116op of r%" strip copper for the primary, cerned from the generato: to the :.n 63 / //ZikHa/fNoh- one of I" copper for the secondary tenna That is, Sd/ co{Y!C%lY.O3lmfseG Y. _ circuit. the generator mledrr.JO.Z-fHP' and the last two of I" copper form- must be in resonance with the trans- Blowers ing the variometer. The variometer former primary and external react - p may be connected to either add induc- ..nce. (Refer to Fig. 1. which shows Fd Z\--\ 647, 14043 KW., tance or oppose each other and in this a complete 20 -K.W. transmitter.) --0.,, Ris?-=-Crcail i_ Ho/fAÓh,çop- way gives a wide inductance ratio. The primary and secondary of the nñ Opened .O3Znfset Yoh': The 20 -K.W. alternator rotor is of transformer relations must be cor- h 00_ the wou.rd armature type, the field 0 % rect, then the transformer and the A.--- NidcA%/zs p being separately excited from a Ho- first radio frequency circuit consisting i volt direct current generator, the lat- of the main condenser, gap and pri- ter machine also supplying current to mary of the oscillation transformer. 33 the clapper contactor switches, mag- Then of course there must be reso- netic keys, motor air blowers for nance between the primary and sec- cooling the quenched gaps, etc. ondary high frequency circuits. In the The current in the transformer pri- circuit shown in Fig. t, the note can r4tza7 iaacn r.r,a 2'/aoo ?IO'00 Z30.w P40:00 mary leg approximates nearly loo be broken from a c:ear Soo cycle note =DO 3(fGl 3:SSGb 4425.00 4Y500 4.1500 4:35.00 amperes at full load and presents a to a rough "rumbling noise" by vary- Time oisrrar Ratio tiom problem to ing break same for sending the supply voltage to the trans- Fig. 3. This Diagram Shows How the Decrease in Spar king telegraph. To overcome this, the sec- former, changing primary condenser Distanceis ance Results in Reducing the Transformer Secon dary Voltage. ondary side of the transformer is or inductance, or the antenna circuit broken before it reaches the wave- primary length. The percentage of sta- condenser bank. This current is ap- bility of note is obtained by determining- on primary side with secondary proximately one ampere but at 25,000 volts over what limits the transformer supply short circuited. and gives a decided "arc." The break at voltage can be varied without the note R Ratio of Transformer turns. this high voltage is made with special mag- breaking. XP Primary reactance, open secondary netic keys, having horn contacts and the To demonstrate just how the various at working volts. break being right in a strong blast of air values are related to each other. consider the generator, transformer and primary condenser and refer to Fig. 4. This shows graphically the transformer primary supply voltage and current variations with primary condenser variations from .o4o MF to .080 MF. It will be noted from the graph that the voltage and current are not in phase. The following formulae give mathematic- a'ly all the relations of the component parts of a quenched spark transmitter to each other and are based on actual laboratory measurements, at working frequency: XIT Total effective primary reactance. ohms. X2T Total secondary reactance. ohms. XC Working secondary capacity react- ©/9rr1,y,,ihem ance. Complete Hook -up of a High Power Quenched Spark Transmitter. 'Formerly Designing Engineer. Marconi Wire less Tel. Co.

www.americanradiohistory.com Radio News for March, 1922 809

15 gaps. The tem- 70 perature of the Generator= 450Cycles gap units is meas- 7200 I 074Amperes Excitation ured with an alco-

although I I- I I thermore, 2400 t the gap resistance 20/CWStation in- increases with Resonance with Khaotonan /enñq` creased sparking /600 Capacity. 004NFResistance .030 .040 .050 .060 .070 .080 .090 . distance per gap, /5KW 30Units,BlowerCoo /ed © /9219yRadioNews there is a limit to Secondary Capacity ,u. f. this increase, and 800 Fig. 4. This Graph Shows the Transformer Primary Voltage after that the gap Variation With Primary Condenser Variations and Current Voltage and resistance decreas- From .040 M.F. to ,OSO M.F. Note That the is Current Are Not in Phase. es again. This /550 /950 2050 2/50 2250 2350 2450 also true of the Wave Length - Meters © /97Z By Rodia News blower. When send- size of the individual sparking Fig. 6. Resonance Curve Between the Two Radio Frequency from a motor driven The Length. upwards 3" to 5 ", surfaces in square inches. Circuits at 2,000 Meter Wave- ing, the "arc" is blown very but extinguished sufficiently fast to enable losses in the gap increase words a minute. rapidly with increased current transmission at 25 to 3o the tempera- off. The steepness of the cooling curve is The total capacity is .032 MF. and through the gap. Fig. 5 shows heat ra- primary over a length of time both of course an indication of efficient by varying the primary inductance from one ture of the gap diation and rapid cooling. It will be to 18 %2 turns, the wave -length range noted that the maximum temperature is 1,000 to 5,800 meters and may be 95 of the larger transmitter is attained loaded above that or reduced below in about one hour and that is with í,00o meters by reducing the capacity. dots O K W. Navy quenched Cap the key locked. Transmitting of 30 t i The quenched gap consists /frontUnits and dashes, the maximum tempera- in two banks of 15 B/ units assembled tom front 'HPB/ower. . ture is not reached until about three mounted Coa/er/ gaps each. These gaps were 350 A=9.52= hours when sending at a rate of 25 on concrete pedestals and the blower En 40 words per minute. pipes run under the cement floor. a resonance curve NB MI Radiation Fig. 66 shows A substantial drop in radiated en- me s between the two radio frequency cir- is when a quenched ó The transmit- ergy experienced t-,-.., cuits at 2,000 meters. spark set has been run continuously 9t 30 ter decrement is only .0318, indicating 45 for some time. This is due to the 9 that the greater part of the maximum are assembled fact that the gap units Il 1/owptts antenna current is being transmitted Ill /mput under considerable tension. Nali E small band of by a bolt effectively on a very insulating Kilowatts When the gap heats, the E ..Inçç wave -lengths. With a three -ohm an- gaskets soften allowing compression i tenna at 2,000 meters it is possible to _and in addition the sparking surfaces 35 secure an antenna current of 7o am- raise slightly. The decrease in spark- peres, indicating an antenna input of 935 9 ing distance results in reducing the 8.55 9.05 9.15 975 54,70o watts with a transformer input © /9x2 By Kadia Ncws transformer secondary voltage, conse- of 20,000 watts or an overall efficiency input and reduced an- Fig. 5, Temperature of the Gap Over a Length of Time .quently power Current Passing Through of slightly more than 70 per cent.; This is shown very Both During Operation With the is pos- tenna current. the Gap and After the Current is Shut Off. efficiency higher than this ,clearly by the graph in Fig. 3, which sible under favorable conditions. 'shows the reductions in one hour of The watts loss in the transformer core is the key locked. during operation with the current passing continuous operation with shut (Continued on page 895) This particular test is at to K.W. with only through the gap and after the current The Hall Air Jet Relay for Recording Radio Signals of the audion has the relay and recorder, government market OT since the advent weather reports, a more spectacular or useful radio in- reports, news broadcasts, been offered the experimenter and other messages, may be automatically vention code deciphered at than the Hall Air Jet Relay and Recorder. recorded on tape and the many improvements in the radio leisure. In the past, to ring time sig- field have been rsithheld, that would have The jeweler who desires interest to Citizen nals on a large gong, may do so by con- proven of great value and re- is, that radioists of necting his gong circuit directly to the Radio. It therefore, he can the world will more appreciate the recording lay. With a suitable arrangement its release in the ex- automatically set his master clock directly relay, knowing that signal. and commercial fields is prac- from the incoming radio time perimental directly in series or tically simultaneous. The relay operates tremendous influx of new en- parallel with the head receivers of the radio The recent 896) thusiasts in the radio field has shown the (Continued on page necessity of a machine, which ,'/Manometer will automatically record or fo Receiver < give perfect amplification of Re/qy Contract radio telegraph :signals. The or,9mp//fier ` business `man, the farmer, the - CgOnt and the banker, the jeweler, ftta ;G/ct/meat thousands of others who own, # or are contemplating the own- /Off° ON /lOV. d Recorder ership of a radio set. will one J O- 1111 and all welcome this device. Many are unable to quickly de- A/r8 /ower 'AirAqustment ©43w/o NEWS /9ZZ With This Sensitive Relay Messages May be Re- or cipher the code signals as they . corded on a Tape Recorder, or a Bell, Horn Other Device Operated Automatically. are received by ear. Using Connections of the Air Jet Relay in a Receiving Circuit.

www.americanradiohistory.com 810 Radio News for March, 1922

,11111,,,,1,1,,,,,,,illi,,,,,,,,t,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,1,,,,,,,,,,,,,,,,,,,,,I,,,,,,,,,,,,,,,,,11111,,, ,,,,,,,,,,,,,, ,,,, X350 Detector Amplifier Prize Contest F Radio is to be the great thing we not a huge success ; still thousands of The amplified music may be received all expect it to be some day, it will them were sold. on any contrivance that brings in be necessary for the public to be- Our aim is to pay the prizes the as shown volume of the sound loudly such as a come more and more interested in its here for the best detector amplifier that wonders. horn, bowl, etc. If more than one de- The public at large is still will bring in the music loud, so that it somewhat skeptical and tector is necessary there will be no ob- while thousands can be heard in a fair -sized room. Here jection of laymen are becoming converted to to that. are the conditions : With an ordinary Radio each and every day, we are still detector set, it should be In connection with this contest, it possible to hear would seem far from our goal. As long as there is music as broadcasted from one of our to be physically impossible not a Radio outfit in EVERY house in broadcasting stations to award a prize unless the Editors have so that the sound fully satisfied the United States: we have not fulfilled can be heard by everyone in a fair themselves that the de- our sized vice works. For mission. Now, it is a fact that not room. When we speak of a detector, that reason one of the everyone requirements is that cares to invest a great deal in we mean one that is not a vacuum tube. a model must be Radio, but wishes at first to become con- Any other detector may submitted with every entry. This model be used. It may is vinced. Not everyone can visit a friend be a Galena, a Perikon, to remain the property of the builder. or Silicon type. It will and hear the wonders of the Radio It may be a magnetic or an electrolytic also be understood that the patent broadcast and if he does, nine times out rights if any, will revert to the builder, of ten, he finds that the outfit which his and such rights will not go over to the f :-lend has, costs anywhere from $75 to publisher in this contest. The only $too and as a beginner, he does not care rights that the publisher reserves are to invest so much money. 1st Prize $150. in Gold the right to publish the article or arti- So he goes and buys a cheap crystal 2nd 46 75. cc cles on such amplifiers, and also the right set, costing anywhere from $5 up. He for all manuscripts submitted which may takes it home, and makes it work after 3rd 50. " If Le published at his option in future is- a sues. Such manuscripts fashion, but he is not satisfied. His . to be paid for friends are likely to sniff at such an out- 4th 35. at regular space rates,. In all events a fit because a head set is necessary for 5th 46 25. << << complete sketch must be furnished by the music cannot be heard in the whole the contestant. cc cc c room with a crystal outfit. 6th 15. No manuscripts entered in this con- What is desired and needed most to- test can be returned. We reserve our- day to convert the public at large to the 350. selves the right to publish all worthy Radio art is a simple outfit that will give ideas, which did not win a prize by pay- music loudly. At the present time, we ing regular space rates. Use only one side appreciate, this cannot be done. Frankly of the paper for writing and keep we have ourselves not often seen a one. It makes no difference. Or it may sketches on a separate sheet. No pén- crystal outfit that brought the music in he an entirely new kind of detector, of ciled matter can be considered. More loud, and many experts will probably v.hich we know nothing today. The than one idea may be entered by con- deride us by claiming that we are step- only exclusion is the vacuum tube de- testants. The contest is open to every- ping backwards instead of forwards in tector as that term is understood today. one, radio clubs included, except manu- attempting to make a crystal talk loud. In order to win a prize such an ampli- facturers of wireless apparatus. All We are not at all deterred by that, for fier must bring in the music audibly prizes will be paid upon publication. we firmly believe that in the multitude within a radius of 5o miles from the Should two contestants submit the of amateurs, there are a few who will station, on a 4 -wire aerial, not longer same idea, the same prize will be paid to be able to turn the trick. than 35 feet. If a loop can be used, so both. We know that it can be done. Some much the better. The amplifier may be This contest closes on May 15th at years ago, there were sold outfits that cf the microphonic type, or any other twelve o'clock, noon, at New York, by worked on a microphonic principle that type that can be constructed by the which time all entries must be received. stepped up the small energy, from the average experimenter. It should not be Address all manuscripts and vibrating telephone models to diaphragm. These a contrivance that is very difficult to Editor, Radio Amplifier, care of this loud talkers were none too good and adjust and which does not "stay put." publication.

3uunnnnnnnuuunnnnnmmmuunuunwwuuunnuuuuuuunmuuuumnnnumuuuuwn.,,,,,,,11.i m11111111111111111111111111111111113111111111111111111111111111111111111111 ,mr. `- A Transmitting Tube Is A Good Amplifier By HERBERT E. METCALF* WTH entrance the of the general pub - that the desired results are far from satis- not sensitive to weak impulses lic into the radio game, and that it as enthusi- factory, because using the ordinary type of was necessary to start off a power ampli- asts over the reception of radio receiving or amplifying tubes the actual fier with music and one or two stages of ordinary speech from radio broadcasting limit of output is soon reached, and amplification. Many hundreds stations, there has come a of experi- demand for usually is reached in three stages. Multi- ments carried out by a western reproduction of these concerts and company pro- stage amplifiers using over three tubes cer- have proved this statement unfounded, and grams so that they may be heard with tainly make for reproduction of weaker that a power amplifier using 5 -watt tubes practically the same volume as an ordinary signals, but still do not give out the wished phonograph. with 35o volts on the plates may be at- The public has also defor increased output. tached to even a crystal receiver manded that the music and speech through be heard The real way to obtain a power or in- the medium of a proper input coil, and with a minimum of distortion. The aver- creased output is to use tubes which are very excellent age amateur has results obtained. This means become deluged with re- designed to carry heavy loads. These that all stages of the amplifiers quests from neighbors, friends, may be and his tubes are available in the power tubes used power tubes, each with the same voltage, own intimate family, to hear these pro- for transmitting today, and all of the grams, thus simplifying the hook -up. Amplifiers and the loudspeaker has come into standard types now on the market make are now available the general use for their reproduction. on market which are How- excellent amplifiers when used with their designed especially for power tubes. Only ever, no loud- speaking device, either elec- rated plate voltages. If the amateur will tromagnetic one thing must be watched for in using or electrodynamic can repro- substitute these power tubes for others in power tubes for amplifiers, duce or give and that is that off more energy that it re- his amplifiers and then apply a higher plate one must make sure that the amplifying ceives, consequently these amateurs have voltage than he has been accustomed to transformers in the 1,een casting about amplifier will stand the for methods of obtain- use he will find his output enormously 'in- voltage used, so that there will not be ing, additional amplification. Some have creased. In this way, by the use of only burn -outs occurring them. increased the in In the power number of stages and find two or three stages, a power output may be amplifiers now available, special transfer obtained. It used to be thought that trans- coils are incorporated so no '"Engineer, that danger is The Magnavox Company. mitting tubes when used as amplifiers were (Continued on page 903)

www.americanradiohistory.com Sur Radio News for March, 1922 Tubes and Transformers in Cascade Bv JOHN F. BRONT

or no investigation, employs a certain type of tube, generally upon the recommendation of an acquaintance who has had very good and sometimes astonishing results with it, and then when that tube is applied to the ether set of apparatus, finds that compara- tive results are not all apparent in his particular apparatus. It must be remembered that certain constants in individual circuits and certain characteristics of tubes greatly affect the efficient operation of the apparatus in which that tube is employed, and departures from the straight and narrow path laid out by electrical laws cannot be violated without exacting penalties. 1I' iI I11I Il I I I111111111Ì The object of this paper is to present in a way, a few bits of data upon and ©Reojo Nervs /9ZZ popular relating to tubes which may be of utility to W W the earnest experimenter in the construc- ©RRaio News /9Z2 apparatus. F/G.2 tion and operation of late type It must be considered that first of all the The Dynamic Test of a Tube May be Made as interdistances and the F/G.3 Shown Here. shape, dimensions, of the inner elements of The Internal Resistance of a Tube May be relative positions Method. every tube have a direct bearing upon the Found by This N choosing tubes for use with the ex- efficient application of tubes in different ap- perimental set, it seems that the average paratus for different but allied purposes companying "B" battery with a similar me- experimenter is inclined to purchase The vacuum, the gas content if any, the ter. When the grid battery is adjusted to those which in a way may not be quite composition of the elements, the care in a point where the plate current is at zero, the best for the maximum desired re- manufacture, etc., all bear directly upon the the ratio of the grid EMF to that of the sult in the particular apparatus employed. operation of the apparatus in which the tube plate will give the approximate amplifica- It appears that many certain tubes, upon is employed, and although the experimenter tion factor. In this test, the resistance and the recommendation of other users, and em- is not generally in a position to dictate the the voltage drops across the leads is not ployed by them in their own sets, regardless exact manner of manufacture of tubes for taken into strict account and is reserved for of the similarity or the reverse, are in many finer and more intricate work in which the cases totally different from the circuits em- experimenter may not feel inclined to in- ployed by the user who may laud the vir- dulge, being unnecessary for his particular tues of a particular tube, of a given manu- needs. facture. In this static test for the amplification It is quite apparent that the same tube factor, the value of the factor will vary employed in one circuit carrying certain over a certain range for different values of constants and with probable radical depar- plate and grid potential, but an average will tures from the standard type, may function give the mean result. .quite differently in another circuit, of other The static test demonstrates the amplifica- ,constants and other eccentricities. tion factor in an easily reached manner, but Different tubes carry with them certain in the actual operation of the tube under characteristics, which vary to a considerable the influence of an induced EMF from the extent from the peculiarities of other tubes antenna system, it will be found obvious that and they may or may not be the best avail- the result will vary from the factor gained in a given influ- able for the most efficient results FIG./ © RO,o News /922 by the test with the grid under the circuit. ence of a steady EMF, from a battery. that tubes of one This Hook -up is Used to Determine the Char- tube brings about It is obviously manifest acteristic Curve of a Tube. The dynamic test of the type will not function in exactly the same a condition where the operating character- manner as those of other characteristics. istics will compare favorably with the dem- Even in the same type, the various tubes his special use, nevertheless he may apply onstrations evident when actuated by the vary slightly. and especially in those adapted in an intelligent manner the characteristics absorption of waves in the aerial system. to amplification, the peculiarities are ampli- of the tubes which are brought to him Referring to Fig. 2, the dynamic test is fied in almost the saine proportion as the through the markets from the shop of the based upon the theory that the alternating s?gnal undergoing amplification. manufacturer. current flowing in the outer plate circuit The present market affords some excel- In the following paragraphs a few refer- would be the same if it were connected to lent types of apparatus in the form of low ences will be made to certain tests and to an alternator which possessed the same in- power telephone and telegraph transmitters some useful applications of principles, which ternal resistance, and an EMF of the prod- and various forms of amplifiers and detec- may aid the experimenter in a material way uct of the amplification factor and the grid tors in whole units ready for use. The toward the proper selection and operation voltage. manufacturers of these units have applied of the entailed apparatus. In Fig. 2, a source of AC is applied to wir- scientific investigation in the choosing, TESTING THE AMPLIFICATION FACTOR the plate and the grid circuits through a ing and testing of the component parts of the ratio secondary shunted by a large variable re- have ap- The AF may be expressed as these units and in most cases they to that of the plate at sistance, with a sliding contact connected of long tests in formulat- of the grid potential plied the results zero plate current. The AF varies directly direct to the filament. The slider may be ing the best available apparatus of the par- moved across the resistance until there oc- with the plate - filament and the grid -fila- ticular type manufactured. The closer the grid to the (Continued on page 871) experimenter .with but little ment distances. The average filament, the lower the potential required to effect a given change in plate current. For large amplification it is apparent that a close meshed grid placed in proximity to the filament, with regard to the plate- filament inter- distance, will cause a very large flue tuation in the plate -filament electron stream For tests of tubes for the amplification factor, and plotting of the static characteristic curve, the accompanying Fig. i may demonstrate the process. FIGS ©RRO,O NEW /91 F/G4 ©RR,,, News /922 With the ordinary circuit as represented a grid battery is inserted with a voltmeter Audio Frequency Amplification is Obtained by For Radio Frequency Amplification the Tubes its ac- Means of Iron Core Transformers. May be Coupled by Means of Tuned Circuits. in shunt. The plate circuit carries

www.americanradiohistory.com I2 Radio News for March, 1922 A Radio System for Simultaneous Sending and Receiving Applicable to Vacuum Tube Transmitters By LOUIS GERARD PACENT, I. R. E.

ly shielded coil A, equal current flows to the antenna and to the To Receivinglintenna artificial antenna. If the secondary coil is properly located under these conditions no signal will be heard in the receiver VariabieEh- Inductance from the local transmitter but a Condenser Coi/ distant signal impressed on the O-750/t/%fds antenna will pass through the coil A in one direction and it will be detected and amplified by the receiver. This system requires very careful adjustment and completely shielded transmitters -ToRadibReceiver AM/ and receivers. One - half of the transmitter output is wasted in the resistance of .W.miee.-,.rn,pwob the artificial antenna. This sys- '. Mo.ti.se..r%.¡r.r tern, because of these reasons is os, not adapted to the needs of the radio amateur. WHAT IS THE IDEAL SYSTEM The ideal system is ónrrnf wm larhned that /o>//Mlo/rnYrcm.Yy which allows both the n;re®e...w2 transmit- rrnr;R'¡cse/c ting and receiving apparatus to be installed in the same room which does not require a multi- FIG2 tude of critical adjustments and does not require expensive This Sketch Shows the Ideal Arrangement of an Amateur Station, Using shielding arrangements. Two Aerials and as Good a Ground as Possible The system Consisting of Buried Wires and All the Metallic Surfaces in to be described the Neighborhood of the Station. meets the needs of the amateur and can be very easily put Into .30 operation HOW often have at most amateur sta- you wished that tions because so little apparatus, the old antenna switch could be not which is CO/L already in the station, is required. discarded and a message or tele- Primarily inductance coi/wound with I/6' doable cotton phone conversation sent the system is applicable to sta- covered the same tions using magnet wire, 9 "diz,Turns /7tap at t2 time one was being received? This audion transmitters and it will turns. is not work satisfactorily being done by some of the high power with the spark type Inductance tofu/=.0046/'1. stations and some of transmitters. It is H. Naval Radio Telegraph necessary to trans- At tap = .00Z4f1H. and Telephone Stations. Let us look into mit on the wave -length and receive on an- the methods employed at these stations with other which differs roughly at OA= Hews /972 a view least io% F/G. 5 toward utilizing them for amateur from the transmitter wave -length. use, if possible. Two Details antennae are required; one for transmitting of the Frequency Trap Inserted in the SOME Receiving Aerial. OF THE LONG DISTANCE AND NAVAL and one for receiving. The frequency trap STATIONS is connected in the receiving antenna The cir- WHAT ANTENNAE SHOULD BE USED method, in general, is to employ dif- cuit and performs the important function ferent wave- lengths for transmitting and of preventing This system requires the ordinary trans- the signals from the local mitting antenna, receiving and to locate the receiver far transmitter from being impressed a small single wire re- enough from the transmitter on the ceiving antenna and two ground leads so that exces- receiver in the manner which will be ex- tc sive interference the ground 1 does not take place. In plained later in this article. system. (Figures and 2.) many cases the receiving stations are The transmitting antenna should not be 20 In adapting your station for simultaneous so large miles from the transmitting stations which reception and transmission that it must be operated at less they control of telephone and than its natural wave- length. over a telegraph wire. Such telegraph messages a few improvements Better re- an arrangement is shown sults can be obtained by operating in the diagram may be made at the same time. Some an an- of Fig. A. This method obviously of tenna near but at a longer wave than its is not these are suggested in the following para- natural suitable for the amateur and will be dis graphs. wave -length. The transmitting and missed from consider- receiving antennae should be separated as ation. SendiigAeria/ ReceivingAerial far as convenient. An NAVY RADIO TEL- almost ideal arrange- EPHONE (DUPLEX) frequenyTrap ment and one which will be Some time ago 1 000 met in prac- there tice is illustrated in appeared an article in Figures 1 and 2. one of the radio mag- In continuous wave azines describing a Anfen/aa_ sets it is very im- Duplex Radio Tele- %l/nmefer portant to keep the phone System used by antenna resistance as our Navy. The sys- low as possible. While tern is schematically the water pipe is sat- shown in Fig. B. isfactory for receiver It operates on the kt Key work much lower re- principle that the an- Grid 8/asßaerj sistance antenna cir- tenna inductance, re- Coldforeduce cuits and therefore sistance and capacity Sparking of Key Conlac/s more efficient ones can are duplicated very be made by spreading out accurately by the va- Source of low Source of High a network of riable resistance R, Voltage DC VoilageDC copper wire (Fig. 2) inductance L and ca- which can be insulated pacity C and that from or buried in the when the transmitter ground. All of the F/6 4 wire is connected to the Circuit Showing the Arrangement fences, water for Duplex Operations, Two Aerials Are Used With a Pre- pipes, etc., center of the careful- quency Trap in Series in the Receiving should be Aerial, connected to these

www.americanradiohistory.com Radio News for -March, 1922 813

care being taken in a brass or copper box, Receiving Cir cait not to allow the high frequency coils tc /Secondary cerne closer than l" to the copper. It may ,Careful/yshieldedreceiver of ap- detector amp/NY be possible by careful arrangement I paratus to eliminate the shielding, but this is not recommended. Coil tapped U -- Miles TYPICAL SYSTEM DIAGRAM at Center A typical system diagram showing a station arranged to transmit and receive tele- Radó phone continuous wave (C.W.) telegraph Transmit/er and interrupted continuous wave telegraph Radio (LC.W.) is shown in Fig. 4. _ -Variable resistanceadiistedto ;like antenna resistance. Trar smiffer The circuit is arranged to show the ar- 'Telephone same as rangements for a distribution of apparatus Tansrnrt/er Radio in accordance with Fig. 3. Variable bid/dance adustedío Receiving A description of what is necessary to be MIMI/glue as antenna Midi/6/076e. Station done in order to telegraph by the two means and telephone is given as a means Variable condenser adust ed /o of explaining the circuit. sanie value as antenna capaciiy. ConfroLTetegmphLineXM/es FOR C.W. TELEGRAPH ©Rsmo News /972 Long The switch S, is placed on the off position so the modulator cannot receive an FTG.B kind, switch S3 is placed on input of any Circuit Used in a Navy Radio Telephone Set F/G.R position 2 so that by pressing the telegraph for Duplex Operation. Method of Simultaneous Sending and Receiving key the negative voltage across resistance Employed by Some of the High Power and Naval Stations. R is removed from the grids of the audions de- is tc of control of the oscillator modulator and high frequency power delivered to make the antenna. scribed above, it is only necessary wires. The transmitter and receiver should and break the modulation transformer pri- be connected to this system by separate in- mary circuit by the motor driven commu- sulated ground wires of large area and low TransmiNer tator to produce I.C.W. signals. This can resistance (Fig. 2). be accomplished by placing switch S3 on S_ on contact 2 and start- IS THE ARRANGEMENT OF APPARATUS or contact 2, switch To motor driven commutator. SHOWN IN FIG. 3 SATISFACTORY? Tans ing the when the oscil- HOW SHOULD THE THE SET BE WIRED? term Signals are only radiated Mo%r óenerator operative, which is The ideal arrangement of apparatus is lator and modulator are shown by Fig. 3. The transmitter and all Key when the key is closed. its wiring is separated from the receiver. T FOR TELEPHONE wiring should prefer- Beeiring Receiver All the transmitting The switch S3 connects the telephone in conduit which should be grounded An /ma ably be to the transmitter modulator as should the motor generator and other -Teïbphone transmitter 1 the metal work. circuit when it is on contact and trans- -Tftgraph- TlephoneSwith is on The telegraph key, telegraph telephone mitter is energized when switch S, switch 5, the telephone interrupted tele- F16.3 ©RavioNCws 1972 contact 1. S, of graph switch 5, and the telephone trans- A Good Arrangement of -the Apparatus in the For straight detection the switch position B. mitter should be located near the receiver Radio Room. the receiver is placed on Fig. 4 is a diagram which shows this in a THE FREQUENCY TRAP, ITS FUNCTION general way. The wires between these In order to receive C.W. signals the re- The frequency trap is a circuit which pieces of apparatus and the transmitter ceiver must produce local oscillations. This when tuned to the transmitter wave -length should be put in grounded conduit. is possible when switch S, is on position A offers a very high impedance to currents of the tickler coil in circuit. SHOULD THE RECEIVER BE SHIELDED? which connects the transmitter wave- length and allows very the FOR I.C.W!. TELEGRAPH little to reach the receiver, but offers less For the most satisfactory operating 854) receiver should be shielded by mounting it With the negative grid potential method (Continued on page A Method of Recording Wireless Signals by Means of a Morse Inker By CAPTAIN H. de A. DONISTHORPE battery in THE following description embodies a signals is accomplished in the following bridge A and B, the high- tension this instance takes the place of the bridge very simple and effective way of record- manner : appeal to all Referring to Fig. 2. Thermionic triodes battery. The grids of these two triodes are ing wireless signals and will 852) wireless enthusiasts who are unable to read are inserted in the two opposite limbs of the (Continued on page the Morse signals by ear. The method makes use of the well -known system called the Wheatstone Bridge; the connections of this arrangement are illustrated in Fig. I. If the resistances A and C are adjusted so that no deflection is given On the left is /Megohrn the diagram on the galvanometer then the product of the of connections resistances A and B is equal to the product of a Wheat- of the resistances C and D. stone bridge ---I showing the C7,, The application of this principle for the method used .00/Mf purposes of operating a relay on wireless in the hook- O up Fig, 2 in 0 which two of /0,00003 the resist- 002 /Megohm ances A and -1III- Mf WVJSA B are consti- tuted by vacuum tubes, the relay be- .00/MF ing connected 10,00003 in place of Re/ay the galvanometer.

FIG.? To Recorder

www.americanradiohistory.com 814 Radio News for March, 1922 What Annone Can Hear Complete List of Broadcasting Stations in U. S. By ARMSTRONG PERRY SUPPOSE the American Telephone utter astonishment the replies showed that out any technical knowledge. Other folks and Telegraph Co. and its local sub- not one out of three knew himself what in the house sidiary learned to use it in a few companies had tried to build could be heard with the apparatus he made minutes. But the people of Washington up a business the as radio interests and sold. Even the fact that the list was do not know that such a boon is within are trying to build up theirs. Sup- to have a circulation of at least half a their reach. They pose that, instead have read about it, but of issuing directories tell- million, among persons who would be in- they do not know it. I have ing whom you can talked with talk to with a telephone, fluenced by thousands to buy radio re- scores of them and they have they should offer you marvelled an installation backed ceivers, failed to stimulate many of them at the simple facts that I have given them. up by only two : arguments First, that you to the point of digging up such local in- The man who sold me the set can talk; second, that you would can hear. Would formation as they could secure in five have sold me a regenerative receiver you for such a if he fall proposition? minutes' conversation with any enthusias- Lad had «ay. Maybe his He would have had nie you would. Phonographs were tic amateur. all tangled up in complicated sold in the connections, early days even though there Many of them gave me the information doubtful about the expediency of bringin was little in the way of records to play on that they were very busy. I was inter- into the them. house a storage battery full of People are still buying toy motion ested in that, but it was no news to me. sulphuric solution picture machines acid that eats whatever with only 20' of film. From radio departments in department it touches if it is spilled, prudently consid- They are still born at the rate of one every stores to the high class shops specializing ering problems arise minute, of upkeep that do not or more. But the manufacturer or in radio, I had heard of the fact that the in using the simple set I bought. dealer who wants to sell radio, keep it sold manufacturers had fallen and down -that de- These Washington broadcasts could be build up a business, must recognize the liveries, just at the beginning of a radio maintained fact that just as well in the summer at the present stage of the indus- era that should make millionaires, were 3o time, when atmospheric try middle conditions cause the eighty per cent of the popu days and more behind. No manufacturer, the DXer to pack up his troubles, leave lation is his field, not the them in the closet and go submerged tenth who fall III::I!1:iIf;11111111111111111111;i1111:1 off for a vacation. More for a thing just because it people stay at home is new, than nor the intellectual can afford to go away. ten If per cent who are cap- HE present article by Mr. Perry is one of the most important they can bring in a concert able of learning radio. The because it gives a complete list of all the present broadcasting from five "radio miles away, they amateur" represents stations throughout the country. Things are moving so rapidly should worry because the only the big game, like the in Radio of late that it becomes almost impossible to keep up with range elephant the trend. of the broadcast is or moose that can cut down from 30o miles to be stalked and brought into It is of course no news to anyone that at present Radio companies, 5o, by the summer static. camp occasionally. Some be they manufacturers, My list people dealers, or jobbers, are springing up by the of broadcasts make money hunting dozen over night; but it will come a probably contains elephants. Also as surprise to even the wise ones errors. some can that there are now over seventy broadcasting Much the is sell Rolls radio telephone stations of information -Royces, but Henry throughout the country, and new ones are being from listeners, not all Ford is added almost every and the only man today week. It seems that the Radio interests have awakened to the fact of it has been checked up who is rated higher than that a broadcasting station on top of their roof will pay for itself by the broadcasting sta- John D. Rockefeller, and within 48 hours. tions. But such as it is, I both of them built their suc- And we are only at the very beginning of things. Thus, for in- got it up with my own cesses on the common peo money and with kind pie. stance, the American Telephone and Telegraph Company is now erect- the The common people are ing in New York City the most cooperation of a few man- ripe for radio if powerful broadcasting radio telephone they are station in the country. And for what purpose do you think they are ufacturers and dealers, and told what they can hear. doing it? To rent out the station! I offer it to radio men for I have answered during what it is worth. Some- the past year several hun- In other words, within a month from the date this is written, the advertising manager of a big New York department store may body, I hope, will be in- dreds of letters from men reach spired to maintain a corn - and boys who wanted to use for his desk telephone, and talk over the new broadcasting station to several hundred thousand people, giving them the latest prices plete list and keep it accu- radio. I am beginning to get and rate and up -to -date. Such letters now sales talk from gold fish td pianos. He need not leave his desk, as from women, a list could be printed in a and women spend more than his telephone through "Central" will be connected to the broadcasting station. Thence his voice will be connected with the Radio trans- booklet, with a manufac- eighty per cent of the house- turer's or dealer's advertis- hold funds. mitter to be hurled out into space. The American Telephone and Practically Telegraph Company will ing, and given away to every letter shows that the hire out their station to anyone who wishes to rent it for any length of time, day or night. This may seem nothing prospects and customers, common people are hope- or sold for enough to cover lessly but a stunt to us, but it is the coming thing. It merely goes to show confused by the ad- what a tremendous grip the Radio telephone has upon the popular the cost of printing. vertising, the catalogs, and imagination today.-EDITOR. MOST IMPORTANT BROAD- even by the radio magazines. CAST OF ALL FOR YOU What they want to know The Amateur Broadcast 1111111111111111111111i11IIIIIIi11; is : "What can I hear !CIIIIIIIIIII transmitted from the with a radio outfit and United States Navy Station how can I hear it ?" so for as 1 could learn, had had confidence NAH, New York City, daily about 9.3o Careful inquiry failed to reveal any list enough in himself and his business to use P. M., on 1832 meters is undoubtedly the of the things that common folks -those the dull months last summer to really get most important broadcast for the Ameri- who want to use radio without studying ready for the holiday trade. can citizen to receive. the theory, learning the code or building But a few came across with lists of The message usually is short, about 25 apparatus -could hear. We have our call voice broadcasts. Altogether, the list is words. It is sent at slow speed, to words books, but they are all Greek to the novice, impressive, though I doubt if it contains per minute, and with great distinctness. Even those of us who have used them for twenty -five per cent of the reliable broad- The message is always of interest and years cannot get out of them what the casts that people would buy receivers to often of value, but the importance of the common people want to know, because it hear. broadcast does not depend upon that alone. is not there. These books do not tell In Washington I have been getting It is the means by which the citizen may about the concerts, the lectures, the bed- White and Boyer's concerts once or twice keep in direct touch with our Government time stories, the church services that are a week Once a week I heard a lecture and make sure of receiving instant advice in the air. Those are the things that the from the United States Public Health Ser- concerning an impending disaster, such for army of new radio customers wants to vice, with music before and after. From instance as the approach of a hostile air know about. the Church of the Covenant I have heard fleet, or the menace of an epidemic against Thinking that the collection of a list of not only the morning and evening services which immediate precautions might pre- broadcasts of interest to the public would but also afternoon addresses by eminent vail. be of service in the promotion of radio as men and women. To get all these things, Every American community is neglect- a household utility, I wrote to all the I have used a mineral detector set that ing one of its greatest opportunities if it manufacturers and dealers whose names cost less than $30 to buy and install. I fails to receive this broadcast daily, and and addresses I could secure. To my could have managed it successfully with- (Continued on page 874)

www.americanradiohistory.com 815 Radio News for March, 1922 Note on Oscillations of a Two-Element Valve By JESSE MARSTEN

exist in the tube. Tubes which would not show a blue glow would not oscillate. On the other hand, if the blue glow was very pronounced the oscillations were extremely unstable. Of course, even at best, the oscillations were not what would be called steady. Transmitting was effected by, shunt- ing a portion of the inductance L with a key, and beats were received on an oscillating receiver. f/g.1 fig. 4 In This Diagram Are Only Shown the Essential High Frequency Osc llations May be Produced u the Circuit for Analysis. Using This Circuit. Elements of by a Two -Element Valve, b .20 This might be .ro a blue glow be produced. ALTHOUGH it may not be a very of that a compared, in effect, with the formation widely known fact, it is true ./6 be an arc, and thus the principle underlying two -electrode vacuum tube can `falling char- .14 this operation is that of the macle to oscillate under certain conditions. the tube would underlying its opera- acteristic." Consequently However, the principle /z have, to have a falling characteristic over a tion as oscillator is entirely different from of the 10 certain range, and the characteristic of the three -electrode vacuum tube, and in Fig. 2. that with the vi tube would be of the nature shown by no means is it to be compared oe in 1917, a character- of 1918, soma About a year before, latter. During the summer 0 istic curve taken of a tubular audion showed simple experiments along this line showed is here re- analysis exactly this kind of a curve, and this; and furthermore mathematical 04 in Fig. 3. Beyond the maximum the difference in principle un- produced also proves .02 is a drop in plate current of two- and three - current b, there derlying the operation with increase in plate potential. Oscillations electrode tubes as oscillators. .00 of course, in the region tube, consisting of a Pro` raoo would take place, A two -electrode 50 SS SO 10 IS 20 1S JO 35 40 IS b and c. filament, and a circular 0 S between spiral tungsten F/43 From a to b on the curve, the tube be- nickel disc as plate, is connected in a cir- namely the battery Actual Curve of a "Soft" Tube Having Only a haves as a well evacuated tube, cuit as shown in Fig. r. A plate and a Plate. as the plate voltage. voltage to the plate Filament plate current increases supplies the necessary Beyond point b and up to a point c, the an iron core choke coil of several through also plate current decreases somewhat with in- henrys inductance. The reactance may be Audio frequency oscillations were The cause for C, is the the circuit oscillating crease in the plate voltage. varied by turns. The condenser produced in this way, current from b to c by -pass condenser, at audio frequency being L, C,. The oscil- this drop in the plate usual radio frequency is probably that ionization of the residual and while it may be omitted, best results lations could be heard in a pair of telephone consequent For in series with Li. The gas begins to take place, with will be obtained with it in circuit. receivers connected of the space charge it is strictly frequency or pitch of the oscillations were partial neutralization audio frequency oscillations and hence a decrease in plate cur- a air condenser, varied by varying either the value of Li current, necessary. It is variable rent. Beyond c increase in voltage would maximum capacity about o.006 mf. or in plate could not take probably produce large increases On the left of the valve in Fig. r is con- Both types of oscillations dotted portion of proper. place at the same time. The existence of current as shown by the nected the radio frequency circuit 2. This increase is due single radio frequency oscillations seemed to pre- the curve in Fig. The inductance L is a cylindrical by collision of electrons and 4" in diameter clude the simultaneous generation of audio to ionization layer coil about 12" long and gas ions and between gas ions themselves. wound with 400 to 50o turns of wire. C is oscillations and vice versa. a high had a good vac- That a two- electrode tube with a variable air condenser of the order of As stated, no tube which that the oscil- is was essential that vacuum will not oscillate, and 0.0005 to o.001 mf. The condenser C a uum would oscillate -it electrode tube are based on to prevent short lations of a two- blocking condenser inserted the arc principle, can be readily shown by circuiting the plate battery to filament analysis. This has been L. a mathematical through the inductance done before, and a simple and concise an- The valve may be set oscillating in one / in his recent book the filament at alysis by Van der Bijl of two ways. By burning j "Thermionic Vacuum Tube and Its Appli- increasing the plate 1/4, normal brilliancy and cations," Chapter 8, will be here reproduced. potential until just beyond the point where the essential elements be found that Fig. 4 represents the blue glow occurs, it will Osci//o//ag PegiOn of the circuit for analysis and we are con- oscillations are produced. Or by keeping alternating current our case at cerned solely with the the plate potential fixed (in I and II. R is the valve resistance, to volts) and increasing the circuits about roo 120 L C and R the values of the oscillating beyond the point P/o% wa //age filament current until just circuit constants, i and i, are the A.C. cur- where the blue glow occurs, it will again 2 of the oscillating produced. rents in the two branches be found that oscillations are Characteristic Curve of an Oscillating Two -Elec- circuit. It appears that the oscillations are pro- trode Tube. Note the "Falling Part" of the the Kirchoff equations for char- the Point Where the Setting up now duced at a definite point on the valve Curve Corresponding to (Continued on page 849) acteristic. Also that it is essential that gas Tube WM Oscillate. Increasing the Output of a Rectifier By MAX LEVY the polarity of battery WHILE experimenting with battery Care was taken that terminals was the same as that of the charging, using a two -ampere Recti- The switches were then the following + charger terminals. gon bulb, I hit upon thereby lighting the rectifier bulb, injury : thrown, scheme to overload my tube without Battery switch was pulled out again -down transformer was pro- RectiféBu/b after which the A 6o -volt step leaving the bulb lit, due to the plate bom- a flashlight battery to start the 111m. cured, and bardment. tube ; these were hooked up filament of the S In this way, five amperes may be pulled in the diagram. as shown out of a two -ampere bulb, without injury. In order to start the battery charging, this method at my sta- was connected I have employed the step -down transformer 9DGZ, for about six months and the and the battery By Using This Hook -up, the Author Was Able tion, to the rroV. -line current is still in good condition. terminals to the plate marked "battery." to Increase the Current Rectified by a Kenotron. bulb

www.americanradiohistory.com 816 Radio News for March, 1922 The Development of the Transmitter By JOHN S. ARMSTRONG ONE of the earliest attempts to per- denser. fect a commercial transmitter to When the diaphragm is set in vi- supplant the then used, and but bration, the plates are pressed together more recently invented magneto -electric or less; thus, the distance between their transmitter of Dr. Alexander varies, and this changes their electrostatic Graham Bell, was a battery instrument capacity. While the principle of this trans- de- mitter vised by Elisha Gray, which formed a part was sound, it required a very great of one of his earliest telephones, electromotive force and consequently a large the con- number struction of which, as shown by drawing of cells to operate it successfully No. 1, was very simple, the instrument therefore it was not very practical, due to con- the sisting of a vibrating diaphragm fact that it could be used only on a of lami- short nated iron having attached to its center metallic line and under only the most a needle point of platinum immersed in favorable circumstances. Now, while thi: a fluid of low conductivity, such as acidu- transmitter did not meet with much success lated water contained in a receptacle. in commercial telephony, it has, I have be- the other terminal of the transmitter come convinced, great merits for its use it being formed by a similar needle, pro- radiophone circuits. This is also the opinion jecting into the liquid from below. of J. Stanley Brown, Radio Engineer. tions Vibra- of the diaphragm caused the needle to the time hisof electro- to vary the length, and therefore the re- F/G./ static,Up his carbon the sistance of the path from one point to the This Microphone Consisting of Two Platinum best condition for producing changes in re- ether through the liquid. The Points Immersed in Slightly Acidulated Water sistance between two electrodes by varying variations in Was Devised resistance thus brought about by the vibra- a Long Time Ago by Elisha Gray. the pressure, had not been realized. Prof. tions of the diaphragm cause corresponding David E. Hughs, in 1878, by a long and variations in current from the battery rating the use of carbon electrodes in place interesting series of experiments, proved ccnnected in the circuit, which variations of the platinum electrodes in water, in- that the resistance of two conductors in was loose are then capable of acting in the receiver vented and patents applied for in 1877, and contact with each other was far more granted in 1894, to Emile Berliner, the prin- susceptible to changes in pressure than if ciple of which is shown in drawing No. 2 in which is the diaphragm of ordinary tinned iron, resting against a ball electrode of carbon, carried on a thumb screw. This thumb screw is mounted in a bracket in such a manner as to afford a means of adjustment of the pressure between the diaphragm and the ball electrode. Variations in pressure between the diaphragm and the ball cause corresponding variations in resistance, and thus produce similar fluctuations in the current strength In Mr. Berliner's first transmitter, the diaphragm was about 4" in diameter, of thin tinned iron, mounted very roughly over an opening in a wooden box ; the back contact consisted of an ordinary wood screw. There © vRoIo News /955 has been much discussion as to whether or D= Diaphragm not this instrument ever transmitted speech, 8= Cork Bytíon F/G.4 but it is certain that it was not a trans- "'Yates This Form mitter suitable for of Microphone Was Used by Prof. practical use. F/G. 3 David E. Hughes in His Experiments in 1878. In the same year, 1877, It Consists Mr. Edison of Three Nails Disposed of as Shown. brought out the condenser transmitter, using This Condenser Transmitter Was Designed by the theory of Mr. Edison and Functions on the Principle of electrostatic induction instead Electrostatic Induction, connected with the wires by causing of electromagnetic induction. Drawing No. 3 changes in strength of the magnetic field shows the general method adopted. This in which the coil of the receiver lies. transmitter, as shown, was composed of very firmly clamped together. He found that These currents vary in uni- directional pul- thin metal plates "P," separated by paraffin these laws held for any conducting mate- sation, strength, and frequency in unison paper, having a mica diaphragm "D" with rial whatsoever, and in one of his experi- with the movement of the diaphragm of the a cork button "B" between it and the con- ments succeeded in producing a microphone transmitter and cause the permanent mag- from three nails arranged as shown in nets of the receiver to be strengthened and Fig. 4. In this, the nails A -B form the weakened and cause it to exert a varying terminals of the circuit, which includes a pull on the diaphragm which vibrates in uni- -Diaphragm battery "B" and a receiving telephone, the son with the changes in current, and there- circuit between the two nails being com- fore more or less faithfully reproduced the pleted by the nail "C" laid loosely across sound causing the diaphragm to vibrate. the other two. Any vibration in the air The results obtained from the water trans- caused vibration of the nails, and this mitter were slightly better than those ob- caused variations in the resistance where tained "C" with the magneto- electric transmit - came in contact with "A" and "B." er, but it had the disadvantage of the pres- So, it can thus be seen what crude but for - ence of liquid and could not be used with ward steps led to the production of the fine- much success as a commercial transmitter. 'Elecfrocle ly machined microphone that stands on your It was, however, the first transmitter ever office desk, or hangs beside your transmit- constructed with the idea of causing thr ting cabinet. vibrations of the diaphragm to vary the The condenser tranmitter, to my mind, strength of the current by changing the re- should be of considerable use in radiophone sistance of the circuit in wlich it was flow- transmitting circuits, as therein it is not so ing. essential that current density be varied to The results of this attempt led to further so great an extent as it is that the voltage experiments to vary the resistance of the upon the grids of the modulating tubes be circuit in which the transmitter was placed subject to great changes through very little by having the vibrations mechanical vibration as a cause. of the diaphragm ©Rep,a It will be produce a pressure between two electrodes F/G.2 NEWS .'922 possible to do away with a lot of undesir- able thus varying the total resistance of the cir- An Early Type of Carbon Ball Microphone Pat- crackling sounds such as occur when cuit. ented in 1877 by E. Berliner; there are carbon grains tween the Pressure Be- in the conducting A transmitter the Electrode and the Diaphragm is Ad- path of the modulating of this principle, incorpo- justable. source, it will elim- (Continued on page 852)

www.americanradiohistory.com $IT Radio News for March, 1922 How to Sell Ten Million Radio Outfits By STANLEY B. JONES*

night to be and a rather flimsy contraption of wires a s y ! who wants to sit up half the ENTERTAIN people? E which doesn't do You've got to do one of four doing that when he can get it all in the stretched between poles paper? Radio, much to help the looks of the housetops. : feed 'em, first edition of the morrow's things amuse 'em, or there is a strong " 'em, or tell 'em some- huh! He is also aware that 4or shock a mysterious and know before !" And what does the word "radio" convey and resonant buzzing, thing they didn't one must learn, and advice I once came across, to the average man Research among my intricate "code" which That sage bit of is a strong likelihood I in one Mr. Fitzgerald's friends, and talks with men who sell radio he fears that there think, of Scott (to say nothing of his inimitable "flapper" stories. I remembered apparatus, leave in my mind this composite of being burned picture as a reflection of the mind of John house) by the hissing purple and yellow it because of the force of the basic truth un- sparks which he derlying its rather has seen zig -zag- flippant mode of ging the December. 1922 between expression. A n d Scienco and Invention for small rods. Also, whenever you are the group of hob- really entertained byists who take up you will doubtless NEWS. OPERA, JAZZ--FREE! this strange busi- recall afterwards ness appear to be that you were obliged to spend either fed, or most of their shocked, or amus- nights hunched ed, or instructed. over their boxes What is there in and batteries. As radio that is claim- him interest for him, give ing the a paper or a good and time of so book, and e i g h t many people? I am hours of sleep ! writing as a man rl' never re- Well,why should who has he up, leaving its sit acted to very the family circle real marvels be and his journal, to fond the "Isn't that fiddle with ding - wonderful !" stage. uses? Why? ' As It is wonderful, al- you manufacturers most too wonder- know, there are a ful for its own im- great many rea- mediate good, I be- sons why he lieve. Common should, and it's up to people continue to you to tell him, regard it as a mys- and show him, in terious and compli- such a way as to cated servant of open up the vast nations, a tremen- possibilities of ' ra- dous force, greater dio to him, in a even than the language which he forces of nature, under stands. It which a few gen- can be done. It iuses have bound was just about as to their wills. It is difficult to and sell much too vast John Smith a cam- incomprehensible era or a phono- for John Smith and graph when they Bill Brown. When first began to re- they sink back in - veal their possibil- the worn chair af- ~ day's grapple ities for entertain- ter a c,s, instruc- with invoices or iFi l ment and tion. It just needs accounts or stub- the right kind of born buyers, light an approach, and the bitten -up briar, C-' ZCL we'll take and take up the V7L c/° a dZ Or®7Z ® -but that up later. paper, it is going THE Radiofonola brings all these people's voices -THEIR VERY OWN In the course of to a lot more. lectures, take -not their records, right into your house, every day. Music, my investigation, I persuasion than opera, sermons -all free of charge. num- the radio manufac- asked a large If your neighbor has no Radiofonola, step into the nearest Radiofonola ber of radio ama- turers are showing store for a free demonstration. at present to dig teurs how they .Send illustrated booklet "All About the Radio Telephone." them out of it and for happened to take kindle the spark of The Radiofonola Company, New York City it up. I must ad- radio interest in Branches in all Cities mit, in this connection, that I was their eyes. at the As yet, John astonished above is a reproduction of a page advertisement for December, 1922. This is advance informa- range in ages and Smith has never The covers Mr. Stanley Jones' idea of tion, of which we hope our manufacturers will make good use. It occupations of its thought of radio as what a real radio advertisement should look like -an ad that can be understood by the merest tyro, having any relation unless he is blind. We admit our first attempt is a rather crude beginning, but there is hope that devotees. The hint in due time, and get up REAL artistic copy. a whatsoever, to our manufacturers will take the youngest was himself, such as his boy of nine, the trusty phonograph and well -worn camera Smit'n in regard to the workings of this oldest a retired physician of seventy-two! Surely offers a hobby which is even can He knows, in a vague sort of a great force. radio claim. sprouting less subject to the dictates of age than golf way, that Bill Brown's boy has a jigger A few rectangular boxes, adorned with knobs and dials of itself, whose wild -eyed followers have won on his which has been said to wires, and rigged up roof black rubber, two or three little standards a place all their own as the world's cham- "Pick up Washington" and snatch stray with small rods of metal set up on them, pion boosters. fragments of news out of the night air, but a group of batteries (ah, there's something In one store I spent an entire morning, familiar, at last !), a headpiece, such as seeing for myself just what sort of people of the 7. Walter Thompson Co. telegraph operators in the movies wear, (Continued on page 838)

www.americanradiohistory.com ttuttio News tor March, 1922 Important New Radio Legislation By H. GERNSBACK

WE publish, herewith the correspon- do that if his wave length were 20o meters, Perhaps in two or from now, dence which the three years Editor had with but quite innocently his wave length is a difference of one or two meters in the the Department of Commerce re- often nearer 250, and it is then the mis- length cently. Newspapers wave of various stations will be in the latter chief starts. found sufficient. At the present time, be- part of January made the an- The regulation that we do need is ad- tween 25 and nouncement Radio 5o meters will do nicely. that amateurs would be justment of the broadcasting stations' wave The readers will be kept informed of restricted from sending out radio messages. length, not adjustment of the amateur wave any moves that may come up at Washing- This was confirmed by orders received from length. Also, every amateur should be ton and should great danger threaten, all the United States Radio Inspector, who sent made responsible as to his station and he amateurs will be advised by letter within out notices that amateurs were no longer should be warned, -and if warning does twenty to broadcast weather -four hours as has been the custom reports, market re- not help, he should be penalized to the ex- of the Editor for many years. Appended. ports, music, etc., and later the word came tent of confiscation of his station, -if he herewith, is the correspondence from Washington the which the that present adminis- does not keep within the 200 meters. The writer had with the Department of Com- tration had in mind more or less drastic writer advocates and is quite strong about merce : restrictions, which would affect all radio it, that amateurs should be allowed to do transmitting stationc. as they please within their 200 meter wave Secretary Hoover ordered a special corn - length. Jan. 20, 5922. mission composed of the various radio in- The recent tests across the Atlantic on Department of Commerce, terests, and which was held on February wave length of 200 meters proves that Washington, D. C. 27th. This was a preliminary move to re- the scientific amateur can take care of him- Hon. Mr. C. H. Huston, Ass't Sec. of port to the President what recommenda- self. As for special legislation for the Commerce, tions were in order. broadcasting stations, we do not need it at Dear Sir: Due to the fact that this publication the present time. The writer thinks that The writer just received a letter from goes to press at the end of February, it the Radio Act of 1912 covers all the re- the New York Custom House Inspector, was not possible to include in this issue quirements and no new law is needed. The asking that we give publicity to the fol- the results of the meeting held on Febru- Department of Commerce has the power lowing : ary 27th. The amateurs at large may rest to allow the large broadcasting stations to Instructions have been received from the assured, however, and this is the Editor's use a wave length where interference with Honorable C. H. Huston, Assistant Secre- opinion, -that nothing rash will be done in the amateurs is no longer to be feared, or tary of Commerce, to insert in all General Washington to curb the entire activities even be seriously reckoned with. and Restricted Amateur Radio Station of the Radio fraternity. We cannot con- Why the broadcasting as Licenses the following: stations, at "This ceive of such a thing at this time of writ- present, should send at 36o meters is a station is not licensed to broad- ing, when the President himself has in- profound mystery. Probably it was only cast weather reports, market reports, music, stalled a radio outfit in the White House, intended as an experiment. The change concerts, speeches, news or similar infor- he himself having become an exalted radio that should be made is to let the broad- mation or entertainment." burg, so to speak. casting stations operate it, say 85o to 900 Please give this matter publicity in the The whole discussion seems to have been meters. This has a two -fold advantage. next two or three issues of your magazine. brought about by the large radio interests In the first place, it will not make for con- As the largest radio organ in the United have States, with a circulation of over 70,000 who suddenly become alive to the fact fusion ; in the second place, they will be that in the radio telephone, they have found heard further because it has been shown copies, will you not be good enough to a new industry that will soon rival the time and again that under ordinary condi- give us your reasons for this step ? The automobile. These large interests natur- tions, the longer wave carries better than writer is very much afraid that the large ally wish to have the ether to themselves the shorter wave, particularly when the body of radio amateurs will feel very as much as it is possible to the exclusion receiving instruments are not very sensi- strongly about this rule, as they will nat- of everyone else, and we understand from tive. Let the amateurs broadcast as much urally argue that there is no specific law a reliable source that they have brought a:, they please on 20o meters. It will not prohibiting the broadcasting of music, con- pressure to bear upon the administration harm anyone, but on the contrary, it will certs, speeches, news, etc. The writer has to eliminate everything that would tend to be the means of advancing the art. before him a newspaper clipping from a interfere with their activities. While we are on the subject and talking Chicago, paper where the Chicago amateurs It has been proved, for instance, that the about regulation, to prove our contention seem to be very much incensed at the re- cost of our largest and most powerful broad- that the large broadcasting stations should strictions placed upon them, as they argue casting stations is ridiculously trifling when be regulated in some way, we may make that the Department of Commerce is giv- compared with the amount of business such mention of the following incident. At the ing the Westinghouse people a monopoly a station is able to create. Since broadcast. present time, Newark (WJZ), and Pitts- that will ultimately work against the good ing started a few months ago, even the burgh (KDKA), are both sending at 36o of the radio art. very largest of our manufacturers have meters. That this is downright foolish- Since the writer became identified with been unable to cope with the demand for ness is best proven by the fact that if radio, nearly twenty years ago, he has al- radio apparatus which they make. It is someone has a sensitive receiving outfit, ways through his publications, endeavored naturally to the interest of our big corpor- he can at almost any time pick up his re- to instill in the amateur the fact that he ations to look out for themselves and see ceiver, and the two stations being on ex- must keep within the law, and in many in- to it that there shall not be any hitch in the actly the same wave length, will come in stances, the writer has been successful due broadcasting, because the minute that hap- together on top of each other, snaking it to his various writings, in making the ama- pens, the demand for radio apparatus will impossible to tune out one or the other. teur see this point. fall off. Of course, there are not a great many The writer is very much afraid that this To be sure, we need some sort of regu- thousand receiving stations that can thus drastic order will bring the entire radio lation. We will all be better off if the receive the two stations fraternity up in arms unless, of course, the simultaneously, but new amateur with his "squeak box" does not their number is increasing every day. Is writer misunderstands the ruling. "butt in" when a concert is being broad- it It is the writer's desire to cooperate to then not up to the broadcasting stations fullest casted. If you were sitting in the Metro- to be under such regulations the extent with the Department of that such an Commerce at all times, and we wish to do politan Opera house while one of the stars occurrence will not happen in the future? was singing, and suddenly someone everything in our power to have any rule stood There should be sufficient difference in observed has up and insisted upon playing a harmonica that been found necessary to wave length between the stations which adopt. In this case, will you not you know what would happen. He would send out be good concerts daily, that they will not enough to give us the full facts as to why not live two minutes. interfere with each other. There should The conditions in radio are it was necessary to make this rule, and ad- analogous. be a minimum of 25 meters or better 50 vise whether the ruling If we amateurs who are allotted zoo means that no ama- our meters of wave length difference between teur hereafter is allowed meters were to stick to this, we to send out music would do such stations. Thus, for instance, if New- concerts, speeches, or similar information, no harm. But the trouble is, we do not. It ark were sending at 85o, Pittsburgh should or entertainments often happens that on wave- length differing the amateur insists, in be sending at 900, Chicago at 5,000 meters, from that used by the present broadcasting the goodness of his heart, upon doing his etc. As the art becomes more and more stations ? own broadcasting, thinking that he thereby advanced, such large differences in wave- Personally the writer sees no harm if the amuses his friends. To be sure, he might length will, of course, not be necessary. (Continued on page 898)

www.americanradiohistory.com Radio News for March, 1922 819 An Efficient Remote Control System By ALFRED CLARK and H. D. MABRY control a transmitter can be s/4 " in diameter to provide winding space installed in almost any loca- for the weight cord. A 3/56" shaft tion, thus getting away from passes through the rotor and should be Contro/ the troubles every amateur properly centered to provide a smooth Transmitter has to meet, all at a very and uniform action in operation. Four su'.T T. minimum cost. A small piano wood screws are now screwed into the or small shack set out other end of the rotor, at equal intervals 6pp p Z box > ?I` on the ground or installed around its circumference. The heads Motor--> 1 should then be cut off in such iIOVF,'C.---:{ on top of buildings, will do of these just as well for the location manner as to let the ends protrude about as an elaborate house, and 3/16" above the rotor's surface, and the operator may transmit placed in a position to engage with the S and receive with the greatest steel strip on armature O, allowing rotor to make % revolution when key A, Fig. t Q /911 By,foa7oHews comfort and ease. SeedñgTiansformer is pressed for ,a very short interval. Next The control performs the in the rotor, FIG./ following functions: copper strips, N. are inlaid Circuit Diagram of the Remote Control System Devised by two on each side to engage with brushes the Authors. I. It starts and stops the H and L on every half turn. These rotary gap at will. strips should be smooth and conform to ASUITABLE remote control and 2. It can shut off the entire set and the rotor's surface so its action will be break -in system was desired for control by disconnecting transformer and uniform. The brushes H and L should the operation of the writers' sta- control line power wires. be of light brass or phosphor bronze, tion. After considerable experi- 3. It grounds the aerial at will of with sufficient tension to insure good menting and designing we have operator. perfected a control system at a moder- 4. It operates the relay transmitting ate cost and which has given the utmost key. satisfaction during the four months it The control is operated by three wires, has been in operation. Noting the dirth C, K and G, in Fig: i. Making a short of remote control articles in the various dot on key A, Fig. I, operates magnets radio magazines and believing that a E, raising armature O, and allowing the appreciate the ad- rotor on escapement switch to make one great many amateurs H, vantages of such a system, we submit quarter turn. This connects switch our method of control to them through Fig. I, starting the gap motor, and switch L, connecting the key B, at con- RFnto News. key. Our transmitter is located in an up- trol station, to magnets on the relay near the main This position of the rotor is indicated town office building, Fig. i, power wires, making it convenient and at the control station by light M, install special wiring. burning. This indicates whether or not Side View of Switch inexpensive to is neces- troublesome light the gap motor is running, and F/G.3 ©iszzeyRodioNews thus doing away with is in a much less cost that the in- sary to show when the control blinking, at in po- Means of This Lever Arrangement the Main of a special transformer. This transmitting position. Also this By stallation I may be operated by and Ground Switch May be Operated From a location also affords better facilities for sition, Key D, Fig. Remote Point. aerial. The receiving sta- key B, Fig. r, thus operating the send- a transmitting transmission is tions are located eight blocks from the ing transformer. When contact with the strips N, and yet not in the residential section finished, another short dot on key A, transmitter, its off position, cause too much friction on the rotor. turns the rotor to These brushes should be cut in a short shutting off the gap motor and discon- In this position, distance to insure good and even contact. necting the relay key. Weight P will depend on the friction it light M, Fig. I is off_ Holding down key revolve, will have to overcome in the rotor, and A, Fig. I, allows the rotor to by experi- until the weight P, Fig. 2, touches trip this can best be determined B, Fig. 3, .which ment, after the switch is built. In our S, Fig. 3 releasing arm is used. The pulls out the line switches thus discon case, a two -pound weight necting A.C. and D.C. current from the length of cord on the rotor determines grounds the the number of times the control may be entire system, and also operated before the entire set is shut aerial. This arrangement provides abso- to lute safety to the remotely controlled off. In our case string long enough by cutting off every source of permit turning off and on Ito times was F162 ©/911 By RawNenr station, used and it has proved sufficient for all current to the transmitter, and also operation. Details of the Revolving Drum Upon Which Are grounding aerial. ordinary the Fig. 3, illustrates the method of clos- Fixed the Blades Making and Breaking the 2, is the Circuit. The escapement switch, Fig. ing down the station and grounding the salient feature of the control, and was aerial. This feature was incorporated in where we are not bothered with induc- constructed as follows: All references the control to provide absclute safety of tion from nearby power lines, or from to parts will be in Fig. 2. The actuating operation. This trip S is placed so that street noises due to traffic. The control magnets, E, are Ford magneto recharg- as the rotor unwinds and the weight P system has the added advantages of do- ers. These, we understand, are no longer be descends it will finally set off S, thereby ing away entirely with the crash of the on the market, but amateurs should releasing arm B, throwing out the line transmitter which is often troublesome to able to get a set of them very cheap at of those switches and also operating the ground neighbors and parents in the late hours any garage. For the benefit switch. This is a very simple arrange- of the night. In fact we have all the unable to purchase the rechargers, we ment, being run with cords and weights, advantages of two transmitting stations give the following dimensions: Each utmost satisfaction. No. 22 and has given the for the cost of one, due_to each operator magnet is wound full with enamel The weight on arm B should be sufficient having control keys in his own home, wire, is 3" long, 2" in diameter, with a switches. O may to provide positive action of the with an inter -phone system between. 3/4" square core. The armature (Continued on page 846) The break -in system is also very desir- be of wood or fibre and has two iron able during heavy QRM or QRN. We washers fastened to its upper side, spaced have found the two receiving stations a to correspond with the magnet ends of great asset in handling traffic and doing E. On the under s:;de of this armature DX work. due to the fact that both op- is fastened a steel strip to engage with W'" //////%i !: erators can copy at the same time on the pins in the rotor. The armature is separate receiving sets, and often one op- hinged at the back to allow the magnets erator will get what the other misses, due to actuate it, and an adjustable coil to QRN or QRM. With the abolish- spring is fastened on the under side, to ment of blinking lights, crashing noises, assure a quick action of the armature. neighbors and the accom- The rotor for this switch was made of complaining down should plishment of absolute cooperation in re- hard wood, and when turned F/G 4 ©/911By RadiW/ews citi- be about t " in diameter and 7" long. ceiving. we believe that the perfect / of the Relay Rey. zen radio situation is realized. With this One end of this is turned down to about Detail View

www.americanradiohistory.com 820 Radio News for March, 1922 The ReIa Antenna Transfer Switch Its Application to Vacuum Tube Radio Telegraph and Telephone Sets By LOUIS GERARD PACENT, I. R. E.

TELEGRAPHY How can the Remote Control Antenna Lgh/ningSwi>ch Switch be used? The remote control antenna transfer flex. lead r switch can be used with either a continuous - wave (CW) or a modulated or interrupted continuous wave (ICW) set as illustrated in Fig. r. This relay switch is controlled by the small switch S which can be located, for convenience, near the transmitting key. When switch S is closed, the antenna is connected to aller the transmitter and the resistance R is connected Oscillator in the negative lead of the plate circuit generator by the relay switch.

Slopping ?Oahu, How does the Resistance R stop the Os- Cond Resist. cillation of the Transmitter? This resistance, when in circuit, due to Rado the current flowing through it, applies a FregCho e large negative potential to Call the grid of the Tile:graph --y oscillator through the grid resistance and Key the leak Close Sw GridLeak grid of the modulator through the toSendS R Resistance modulation transformer. (Figs. r, 2 and 3.) & Cana( This voltage is of sufficient magnitude to 2 reduce the plate current sufficiently to stop oscillations and reduce the power taken by the modulator D C to a very low figure. Upon erm i n a /s . / -2 / o i7-25' orA'B' wi th short circuiting the resistance, ,ftrapreniovedforG. {Y. Te/egraph. the high Vèrmina//-Zto CO frBuzzer negative potential is instantly removed and the circuit oscillates 7bdu/a/d 7e%grnph. SWall Set and is ready for mod- Rr For gpprox /0000 Ohms ulation. SO 3000 A New Way to Control the Oscillator of a CW Set. F/6./ Qc eRam*s Isrz Complete Hook -up of a Combination Modulated Buzzer Transmitter and Receiver Equipped With a For Continuous Wave (CW) Telegraphy, Relay Switch. instead of connecting the key in series with the grid leak resistance or in series with iN. most of the radio telegraph stations push button located on the transmitter the yesterday hand plate circuit, as it is usually done, it of and a large number of set so that by pressing the button it can be connected amateur and is pos- to short circuit and insert experimental stations of the resistance R in today, the somewhat the negative lead of the crude hand -oper- generator as already described. This ated switch was used to change from can the transmit be accomplished in Fig. r by removing the to the receive positions. This, strap AB or A'B' and of course, while not very convenient, connecting the key is not contacts r and 2 to A' and B' or and so disadvantageous for telegraphy as for A and B. This inserts telephony. the key in series with the lower cbntacts of the relay switch. Think how unnatural, if not difficult, it Upon closing the key, with the switch S would be, if each time we spoke it was closed, the resistance R is short circuited necessary to throw a switch, and throw it and the large negative potential is removed again in order to hear. and oscillations are produced. In the ordinary radio telegraph circuit, ICW Buzzer Modulation. Key Connections. if one station is transmitting and local in- For interrupted continuous wave (ICW) terference makes it impossible for the re- telegraphy strap A B and A' B' and connect the key ceiving station to copy the message, the Here is the Relay Switch Made From a Tele- contacts r and 2 to d and d receiving station cannot break in and tell graph Sounder of the modulator circuit. (Fig. r.) The the transmitter to stand by until buzzer and key are connected around the inter- sible to the ference (QRM) is over. How talk, and by releasing it, it is pos- resistance (2o ohms) as shown, so useful it sible to listen. that would be if the receiving operator could there will not be a rush of current in the break in on the transmitter in just the same way the receiving operator breaks in on the transmitting operator of an ordinary wire telegraph circuit. The purpose of this little article is to describe an antenna relay switch which .11111111111.11111111111111111111111111 makes just 42Yotts this possible for Continuous Another cir- Wave (CW) and Modulated Continuous cuit including -11111 Wave (ICW) transmitters. a relay switch. In o 20 FOR TELEGRAPHY this case it is o Ohms operated by r. An arrangement which makes it pos- the key itself Buzzer,' sible to change and forms a from transmit to receive breaking in s by the operation of a small switch near the system. telegraph key. Key up Receiver. I-11I1I1 Grid Bias Key down Sender Badery 2. Use of the relay switch in such a way Switch Sc %sed that break in BuzzerHodder /edCW operation can be accom- Switch Sopen plished. Conhguous Wave Moduledig 7e/egraph FOR TELEPHONY Choke Coil 3. Connection of the relay switch with a Reeveltesrrsrr

FiG.2

www.americanradiohistory.com Radio News for March, .r92 821(

Screws With Silver Contacts Detai/ 3--,, h'ardkitber Piece fastened 'Coupling Condenser Ru66erSNpport 1 in Raniinun /lember Peta Detai/1, -To Receiver ,fntennaPost A lt /Nmmum ToAntenna, -liardRubber Member /nss'lating Peces Detail 1 Secondary', Pea//2 Tuning -- Con ta c t Str ip Oeta /7 5 Condenser Battery --ToTransmi/ter -. T Antenna Post Brass Angie Binding 000 Detai Post., /8

Te%phoneTransmiHer Fowl 'Raw' Set °ocd ,Push ovSw- Buttnn Insulator Har d Ru M er .0e 1o7 QRnc,o /Kars /972 On the Right is the Hook -up of a Radiophone Station With Remote Control, Operated by a Push Button Mounted in the Handle of the Mic- Modulating rophone. Above is a View of the Relay Switch Choke Coll With the Parts Indicated to be Built According Telephone to the Drawing at the Bottom of the Page. Receiver wound /23 to some tails of the mpedance as modulation transformer circuit each time /lead Set ar- connection s the key is closed and opened. This of the push found to work very rangement has been which Rn0/ONws /972 many troubles button 1763 satisfactorily and by its use, is mounted tubes, generally present in buzzer with on the trans- SWITCH sets will be absent. place. DETAILS OF THE RELAY modulater mitter hand set or other convenient of is, for the sake of The foregoing description of the use Condenser C and Series Resistance R Pre- The receiving circuit up the using capacitive coupling and the antenna relay naturally brings vent Sparking and Sticking Contacts. variety, one "How can one be built ?" The the transmitter is one of the ordinary question: The condenser C which can be / or I next few paragraphs are devoted to a de- mfd. paper condenser and the resistance R types. scription in fair detail, of just such a relay across the switch The push button can be conveniently from the materials easily ob- (15 -3o ohms) connected those switch, made relay contacts, will eliminate the mounted in the hand set similar to tained by the amateur. S and the Chaser. Radio at these contacts. The resistance aced in the Submarine Fig. 6 is a photograph of a switch which sparking the U. S. Navy. Inuits the flow of current and prevents Telephone Sets used by will operate satisfactorily on a 50- or too- The push button has three springs which watt CW, ICW or Telephone Set. The sticking contacts. supply the battery or generator which close two contacts ; one to 20 -ohm sounder, the magnetic circuit of The storage battery, the other to op- is modified con- the filament circuit energy can he microphone with which has been retained, furnishes antenna relay switch. With this siderably as shown. used to supply the current and voltage nec- erate the (Figs. arrangement, conversations can be carried The sounding member has been removed, ' to operate the relay switch. essary on very satisfactorily by remembering the the aluminum moving element has been I, 2 and 3.) button to talk -re- shortened (Fig. 4, detail 4). The contacts the or- following : "Press the The circuit of the receiver is of on phosphor bronze contact strips an audion lease it to listen." (silver) are dinary coupled circuit type using (Fig. 4, detail 5) and have been fast- detector and one stage of amplifica- ened to the insulating detail 6 Fig. 4 tion. which in turn is fastened td the ->IS%LVER 4. The rubber in- How Should the Transmitter be Con- CONTACT aluminum detail nected to Protect the Operator RIVETED sulator detail I is fastened to the From Burns and Shocks? 'ç ON brass base of the sounder by the the oscil- DETR/G 5-2REQD brass angle, detail 8. To this insu- The transmitter employs hard rub- lating and modulating circuit similar lator are fastened the four by the Western ber pieces detail 2, Fig. 4, which to that employed bushings. Electric Co., Inc., in their Army and carry the threaded brass TNRfADED The contact, 6.3 2 machine screws, Navy Telephone Sets put out during yy filament T03zMRUL fitted with silver contacts (Fig. 4, the war. In this circuit, the SCREWS; buzzer and the key are --- detail 3) fit the brass bushings in circuits, the and are provided for adjust- at ground potential and it is impossi- R SEC R-A detail 2 DETA/L 2-4REQ'D. ing the relay switch. The lock nut ble for the experimenter to get a DETAIL /- / REVD. these serves the double purpose of lock- burn or shock by touching SOLVER CONTACT 2 3.) PO/NT ing the screw in position and fasten- parts. (Figs. I, and BRIMS ANGLEX,f' nnnnrni :t ing the wire from the set to the z The Break in System. Nowt o o O SCREW W/TN ZOO( NOT contact. W We have just seen how the obso- TP.READEDTOT/TBUSNLNO WHY RUBBER IS USED FOR switch BRASS ANGLETOFASTENOETR/L/ A`DETA/L2 INSULATION lete hand operated antenna TO 8H55 Of SOUNDER TRRfADED DETAIL 8-4REOa be replaced by a switch operated * HOLES-- Rubber is a better insulator at the can DETR/L 8- /REQ D - one. The same antenna switch can very high frequencies than such ma- - by the telegraph key it- DETA/L 4-/REQN2 terials as the ordinary micarta con be operated the self. (Fig. 2.) With this arrange- densite, etc., available to amateur. SCREW-, For this reason it should be used ment, the set is ready for reception TNREA the key is up and 1-WASHERS wherever it is necessary to insulate at all times when high voltage high frequency leads. for transmission when the key is CONTACT' The this arrangement it is sounder, with its modifications down. With STRIPS should be mounted on a sub -base, possible for the transmitting station DETA/L S, if he preferably of hard wood, in order to to hear the receiving station provide a satisfactory binding post breaks in. for the movable contact strips. The For CW telegraph, the switch S in insulated binding post is illustrated in the modulation transformer should Fig. 4, detail 7. Fig. 5 is an assem- be open ; for ICW, the switch should bly drawing of the relay switch and be closed. The oscillator circuit of shows, among other things, the flex- DETR/L 7 2REQD Fig. 2 is of the simple grid feed back ;SILVER P/N- .4. MACH -/NDENTATONTOMEE ible leads between the binding posts type and was used to some extent by CONTACT SCREW /RON MEMBERS OF SOUNDER and the contact strips. ORRa,o Nnrr all the British during the war. DETA/L 6-/REO la In operating a set with this switch, F/G.4 it The complete circuit diagram of will be found that as close spacing as possible, consistent with the radio telephone is shown in Fig. safety, Relay Control Switch, (Continued on page 899) 3. The circuit plainly shows the de- Constructional Details of the Automatic

www.americanradiohistory.com 822 Radio News for March, 1922 Soon By H. GERNSBACK PERHAPS you did not know it, but rage, but not the boudoir. Now here is colored ribbons radio has at last invaded Fifth can be inserted into the your chance, Manufacturers, to make a big right places. This is all important. It is Avenue. By this we necessarily do clean -up by selling boudoir radio not outfits. very récherché. mean Fifth Avenue, New York, Allons! The but every "Fifth Avenue" through- cases or boxes for complete receiv- Our cover shows just a few tame ideas. ing apparatus should be out the country. There is now hardly a furnished in vari- For instance, the radio toilet outfit con- ous wood finishes so that the furniture of department store that does not boost its tains besides the regenerative set also a radio section, from one end of the country the room can be matched as well. For in- mirror, powder puff container, comb, scis- stance French greys, or ivory colored ones to the other. They are even selling the sors, nail file, and other necessary burglar's outfits now in hardware should be particularly acceptable at the stores, drug stores, tools. On the front of the cabinet, merely present clothing stores, and many other stores, time. Boxes can be covered with by pushing a button, a panel will drop silk or brocade as well. candy stores excepted. At least, up to the down and this brings into view the hour of going to press, none Black panels on outfits for female con- of our scouts hidden perfume safe, containing any- sumption should have reported any candy stores that were where from be entirely taboo. The four to six bottles of Mary manufacturers of composition or bakelite pushing radio telephone sets. But we have Garden Extract, Quelques Fleurs, Eau de hopes. Cologne, Muguet materials should resort to distinctly colored de Houbigant, etc. The panels resembling the furniture of the rest By right, the head line of this article perfume waves, mixing with the radio is wrong. If we of the room as much. as possible. This had had time to would give that last touch of finesse so correct it, we much needed. Here is lll'I It is understood that apparatus would have gladly where of this done so, but our radio kind will come very high. The better the time being taken comes decoration, the higher the prices that they into the will bring. We understand a large up so much of late home. that we bring the cor- Getting eastern firm engaged in the manufacture of rection notice here- the gossip such apparatus, already has given out or- by radio- ders for several thousand radiophone cases with. The correct phone will title should be, "The be the all decorated with reproductions of old Girl and the Wire- thing in masters. The painting is to be done in less," or perhaps, the fu- olive oil, due to the greater insulation. ture. As for grid leaks, "When Radio In- 111111IIIIIIIIIII111111IIIII vades the Kitchen," these should be ta- or, "Houswifish Ra- boo. Unless, of dio." All of this is course, a waterproof not a joke, as the container is furnished adjoining illustra- with it to catch the tion clearly shows, leaking waves. Some of the latest where the housewife SHIPPING VEINS receives NEWS SERVICE outfits now contain the latest WEATHER REPORTS gossip by i STOCK PLUCTU, marcel wave imple- r a d o TIONS CHURCH SERVICES ments as well; they while she washes dishes at the sink. waves give better STORIES FOR CHIL- combine easily with After having been invaded with the "reception." Every DREN Spanish SPORT NEWS the radio waves. Influenza, es this epidemic has suc- condenser instead MUSIC SINGERS cessfully given way THEATRICAL STARS "Ticklers" should be to the insidious bite of having the bru- IMPORTANT PI. B. of the Radio Bug which has LIC SPEECHES avoided assidiously at last at- tal looking black in tacked the female contingent and seems all outfits. There's it composition knob a reason. sure now that the hard boiled fair sex should have a Wireless Telephone has gone vel- Two step amplifiers all daffy about it. Just think vet knob, pin cush- Brings Sermons, Concerts, Lectures and News what DARN PROGRAM are not chic, any it means to mamma to stay right at ion -like in which To Your Home the stove and listen to longer. Fox trot am- the latest gossip, pins may be stuck alto P To posse., a WIrcicss Telephone' is to have at osir and ut Eau, home the latest s, plifiers are much instead of walking through the back yard thereby Fe.e etc the killing ' two so ^ts of all sorts. a infinite !...Z-am,"t M;° Icp more up -to -date. and doing t it over the fence. The wireless ideas with one cps of c leanly in r.al -. It has the bulge FOr'rtll,'°ar'« is of, iiaki ''I nlembe of the lamily. If only some gen- on the fence for the simple stroke. The idea is men the youngsters ` reason that ius can now incor- the lady of the house at the to have the ladies Sa small and simple is this machine no mechanical lose;MV:rtn'. knowledge whatsoover s required to mn it up or porate jazz into a re- fence can only hear one, or Adding lays, at the most, get stuck on the Ia operate it. And, best of all, it is very.moderatc two . in price. generative hook -up gossips at one time. By radio condenser. 8.20-Rnsa Low. she gwargzu.sic by McLane, complote set, to keep the tubes can get any amount of selections of gossip As for 825.00 $89.00 in other Wednesday $32.50 (with,,,,,, ) $200.00 complete from oscillating too any tune, and in any degree of scandal electrical a p p a r- gv,br:tM1:rï"rz'éZitáL $25.00 complete $230.00..iihbudspeaker that she desires. strongly, radio will And if she does not like atus such as Demonatrotions on Our F,JIA Floor tele- 8.20-Luella Meal, coloratura be in its millenium. one particular kind of divorce soprano case. she phone cords, we 9 taiss Inns. dnnuue We have up the.` on set one of outfits our rihh Floor set that As a brand new ar- may tune in goo. may listen in to the hoary m e, n ,, reports ,na to another without much ado, would suggest frlday a drop s during n v ñ the day after) ticle for feminine and at her free will aIrcknin the ',melee m con- and volition. Neither pink, or other aruárel;.` is PowdvLaew Ali y,n need ruanoy all Mete conveniences in youronn home sumption, we she forced to listen ust> ñ the machine. The Programs. are especially might to the entire string color, to match the whah devised, of charge, for ail those who pawns Nose outfits. begin suggest a loud gossip for she can at it A_M. and last nail 11 P. M. talker, tune out the par- general, color ] P ht.-Rnk Storey. ticular "tame" gossip not desired. as is. By this we do scheme of the bou- S r . a,.-A, r Any One Can Instali It But joking aside, has it ever occurred doir. The head not mean the Iady to you, Mr. Manufacturer, 5th Aumae Ca. herself that you are band should be JYIIWO McCreary & 34th Street -we mean the missing one of the best bets by not cater- covered radio loud -talker. ing with silk to the female faction? At the present of the same color. At the present time, time you are making outfits only for the The telephone caps this is merely an ugly, male members of the household. Now, should black or nickel -plated as be finished off in velour in a color horn that mars any well- educated dog knows, the male to match the tout the landscape. Would it not member ensemble. be better to of the family is the one that is As for the pick out a good -looking tenor permanently "broke," vacuum tubes, they are dis- of the Metropolitan while the female of tinctly cold now Opera and reproduce the species, being and they should be made him about a foot stronger and more mag- in gaily colored glass. high, in some sort of ma- netic, attracts all the cash. Heliotrope or a terial that has Now then, we darle shade of coral would acoustic qualities? say, why not cater to this class of be acceptable His inside, of trade? to most ladies, we believe, as the tubes course, would be hollow-as The present mannish looking outfits are well as his head. With his mouth all right for father would then cast a much richer glow. The wide open and son, but not for electrons, we are sure, as is his wont -he would be enabled give the lady of the house or the would go wild to fair daughter about it, too. They should be made forth the radio music artistically, who wishes something that the newspaper in all and no reporter colors -the tubes, not the electrons -to doubt acoustically, to a high degree. would call "snappy" or, le dernier match prevailing color schemes Manufacturers eri, or "long, low, and rakish." of the room. could have an entire line In other Every article of manufacture, be it a con- of such loud talkers, words our present radio outfits have no such as Gigli, De Luca, dense r, B- battery, variocoupler, etc., Martinelli, etc., so that style. They may fit the garret or the ga- should also have provisions the future shopper made so that could pick out the tenor she likes best.

www.americanradiohistory.com Radio News for March, 1922 823 Storage Batteries for the Plate Circuit BY CHAS. K. FULGHUM

holes slightly over an inch in diameter are bored in it. These holes should be about 2" in depth and should be /' apart each way, and an inch from each side of the block. When bored, the edges should be finished smooth with a piece of fine sandpaper These holes hold the test tubes that are used as containers for the elec- tau trolyte. The design of 1111 rI these unit cells will be LIP considered later. JL) At one end of the base, a panel of bakelite FIG.2 c/G.3 is placed. The template ©Rwoio News /522 Fig. 2 is the Layout of the Front Panel for Switch FIG./ for this panel is given Mounting, While Fig. 3 Shows the Shape of the Plates in Fig. 2. All holes are Which Should be Made so as to Have the Largest Details of Mounting of the Storage "B" Battery. 3/16" except the one Possible Surface. that contains the switch ANY amateurs would find it pos- bishing. The switch lay -out can be varied now be considered. As containers, i" by 6" Bible to install a low powered if desired. test tubes were used. They can be pur- C.W. or telephone set if the cost The construction of the cell units will chased for about five cents apiece. The of a high voltage generator were separators were strips of window glass obviated. True enough "B" bat- 6%" long and slightly under an inch in width. They can be cut from an old win- teries can be used, but their cost would V scon be so great that it would be policy dow pane or picked up at any store where to have purchased a generator in the first 11 glass is sold. For the electrodes, strips of place. Also if one is using a power am- lead were used. Sheet lead can be pur. plifier the cost of "B" batteries is usually L--- chased in a number of thicknesses at most very great. plumbing shops. In this case it was found This article covers the design and con- best to use a thickness of about i /io ". If struction of a high voltage storage cell that (a) plain electrodes, as shown in Fig. I, are is comparatively inexpensive and that can used, they are cut in strips %" wide and ii" conveniently replace the "B" batteries now long. They are bent in a hair -pin shape and used in receiving sets or as a source of held to the separators by rubber bands. As high voltage in a low powered telephone or the surface presented to the electrolyte de- C.W. set. The unit is so constructed that termines the amperage of the cell, it is desirable to increase that surface as much as it can be charged from a regular 12 -volt Fli recti fier. possible. This can be done by corrugating Fig. i, shows 22 -volt unit that is variable the strip as shown in Fig. 3. These cor- over half its full range of voltage in steps rugations can be made by passing the strip of two volts. It is convenient to use with of lead between two fine toothed gears. the new Radiotron detector tubes. The The outside electrodes at the ends of the construction of this unit will first be des- ®/reoio NEWS (b) battery are made by cutting the strips in cribed. /922 half. The ends that protrude over the cell A block of quarter sawed oak was used should be left quite long. At the end furth- are fitted as the base. It measures 9" by 4'" by 3 ". Hook -up of the Switch Controlling the Voltage est from the panel these electrodes It should be finished off smooth and io to the Cells. (Continued on page 864) The Newspaper of Tomorrow By J. FARRELL SEATED comfortably in the club car Government has installed near Berlin a pest Opera House. Plans for receiving the of the Twenty -first Century Flyer - wireless telephone station for the broad.. opera from Berlin are now being made. fast airplane service between London casting of general news on a regular daily The "newspaper" has had a huge success and New York -the president of the schedule throughout the entire country. and similar "publications" are soon to he Ultra National Bank removes a small The "Telephone -Hirmondo," Budapest's started in France and Italy. rubber disk from his vest pocket and places telephone newspaper, has been operated con- The radiophone broadcasting service of it over his ear. A moment hence, he will tinuously since 1894. The "newspaper" has the Amsterdam Bourse has been of great receive by radiophone the financial news of 6,000 subscribers whose telephones are con- value to financial interests in Holland in the world. Simultaneously, millions of nected with the central office of the pub- keeping them in immediate touch with mar- other people all over the globe will receive lication by means of 42 party -telephone ket conditions. The sending equipment is the message. At designated hours, news of lines, and a regular schedule of news, in- located in a small room on the floor above a general character will also be received. struction and music is provided from 9 a. m. the Bourse and consists of a motor gen- The broadcasting of news by radiophone to to p. m. daily. The subscribers are un- erator affording a current of 40o volts, and had long displaced the daily newspaper, able to call central, and "listen in" simply stepped up to 4,00o volts for the plates. and. . . by holding the receiver to their ears. Fic- The panel is equipped with two rectifying

Don't scoff ! The day may be nearer than tion stories are read to the subscribers tubes, three i- kilowatt oscillators, a j-kilo- you suspect. In Hungary, a wire "telephone every afternoon. Lectures and speeches are watt modulator and two i- kilowatt ampli. newspaper" has been successfully conducted also delivered. During the war, daily in- fiers. This gives an output cf about i% for more than 25 years. For nearly a year, struction in French was given ; the subscrib- kilowatt in the antenna. The operating financial news direct from the Amsterdam ers are now learning English. In the even- force comprises an electrician at the appal-. Bourse has been broadcasted by radiophone ing, the subscribers attend the opera "by atus and a stentor on the floor of the to 200 banks and brokerage firms in Hol- telephone." This is accomplished by means Bourse, who repeats the quotations into a land. And within a few months the German of microphones on the stage of the Buda- (Continuo" ns7. page 866)

www.americanradiohistory.com 824 Radio News for March, 1922

How to Make a Radiophone Receiving Station A Simple Description of What Is Necessary, How to Make It, How to Install It and How to Operate It, Written For the Folks Who Know Little About Wireless or Other Forms of Electricity By ARTHUR H. LYNCH

A carefully selecting their deal- To Aerial ers and selling their equipment with complete instruc- v tions for its installation and operation. The importance of IIiv\ì=.ia. .:.:. ..:...... ,.,.,. :::...... H,,.;y o the responsibility of the dealer % ttÌ"t:; cannot be over -estimated, for \ÌÌÌÌat there are some who consider f `-°---°- themselves well within their Bindig rights when they exaggerate a Post \ little in describing the results connected \ which may be obtained from to Slides ,Detector any form of receiving equipment when such elaboration To around seems tq be the controlling factor in clinching a sale. Wooden Base for These remarks are merely /G./ Detector andPhone ; included for the purpose of F Posts./ aiding those who contemplate The Aerial or Lead -In Should Not Touch Any- Bindng thing and Should be Kept Apart From Buildings, Phone Cord., the purchase of receiving in- Traes, Etc. This Sketch Shows How the Aerial struments, either complete or May be Taken Into the House Through an In- the parts for assembling. sulating Tube. Here is the Completed Tunng Coil Connected to the Detector It and Telephones Forming a Complete Receiving Set. is recommended that the prospective purchaser carry on his radio or electrical dealer. Where pur- ALL the country is up in arms and dealings with some reliable chases are made in the radio departments is legions besiege the electrical sup - :::::::::::1:111111::1:1::::::::1,:,:::::::::11:111111111:1:,:::::::::1:::1111111111111::::::1::11111111,,:,,::11 of other stores, it a pretty safe thing to ply stores, the hardware stores and limit one's purchases to apparatus manu- WE have had so much demand factured even the drug stores, in an effort recently by companies recognized as being to quench their from Radio begin- reliable. thirst for appar- ners all over the country, that we atus and information about apparatus have SOME OF THE COMMON ERRORS which decided to run a new month- may be used to pick up the music ly department under the above It is quite a common thing to find those and speech from the radio broadcasting heading. novices who have visited some station stations. The demand for this apparatus where radio concerts have been received and A number of articles will be pub- information is so great that the larg- lished in RADIO NEWS every by experimenters with up -to- the -minute est electrical manufacturing organizations month on Simplified Radio, equipment, and who desire to have such a in and we the country, in fact in the world, are hope that it will be the means of station themselves. In many instances they devoting a great portion of their effort to instructing those who are now read smatterings about radio in some of the production of apparatus, suitable for thinking of becoming interested in the papers and gather the idea that all they supplying this demand. Everybody is all Radio.-Editor. need to fill their homes with music and "het up about this won- other entertainment from derful and vastly interesting the air are a few little accomplishment of radio gadgets which may be pro- science and they have every cured at the corner fancy reason to be, for it is cer- store for little or nothing. tain to play a very impor- To a certain extent this tant part in the lives of is true, but in most in- civilized most nations. The stances these folks have a surface of radio's possibili- wet blanket thrown ,Connection tc Rod over ties has been but scratched. their enthusiasm when they With the inception of this find that there are certain tremendous demand for ap- Square Rod' limits -even to radio. Just paratus, coming almost over -Springso/derea'to-Slider -Smut/Screws because fixing there are great ra- night, it is quite natural that JtII Cardboard dio stations, scattered many people shall go into Tube to Discs throughout the c o u n t r y, radio without having any broadcasting all sorts knowledge _--Wooden of of what they are Discs to fit /nsideof Tube------`Square Wooden news entertainment doing and and they are likely to End does not mean that a cheap experience some disappoint- receiving outfit will enable ments. In some cases it is its user to listen to all of safe to say that they are Fi..) Binding Post -- Binding Post them. Some folks feel a likely to be imposed upon ,thsi great deal of chagrin when by unscrupulous dealers they are informed that they would f ii. --Cardboard Tube ' who take advantage t cannot install a receiving \ira ,Connection to Wiring of the uninitiated to the ex- ii set in New York and listen tent of unloading upon to the grand opera trans- them a lot of practically Wiring -' 4 BHA mitted by a broadcast- useless material. ing station in Boston or Some of the large com- l Chicago. It can be done, but panies are constantly work- F/G.2 not with a receiving outfit ing to minimize the possi- Constructional Details of the Coil. Fig. 2A Shows How the Slide r Rod May be which may be had for ten bility of such imposition by Fixed if it is Not Possible to Drill a Hole Through. (Continared ois page 836)

www.americanradiohistory.com Radio News for March, 1922 825 Real Sport Playing Games by Wireless Contests Through t'he Air Newest Snort of the Twentieth Century BY THERON BEBEAU

RADIO is en- Two complete sets of also tering i n t o checkers are our social needed, and, when the fife in more game is started, all ways than the checkers are set one. Playing games up on the two boards, as is The by radio is the Iatest customary. innovation of this players simply report fascinating art. This their moves to each is now a fad of other. Each player thousands of ama- has to make his op- teurs in and around ponent's moves as well City, and as his own. In this New York the the idea is fast way the status of spreading throughout_ game is known at all the country. While times to each player. listening in on the If player A makes radiophone receiver a move he immediate- it is not uncommon ly reports it to B. to hear a conversa- For instance he may tion something like say: this: "14 to 18." ":Your move next. This means that he I just moved from has moved his checker to to 15." from the space 14 to "All right, 8X6, I space 18 on the board. move from 24 to 20." His opponent then ar-

"My game, I've got you cor- rang-2; his hoard to c:orrespond with nered. I move to 19." this stove. 'When the king Checkers is one of the popular rote is reached, the suc- cessft_I player may radio games and a great deal Of say: "25 to 30," or "5 can he had playing it to 4' (as amusement the case may be), king." through the ether. This is -tot W1:11 a checker is jumped, only novel but highly practical. the a ayer doing the jumping since both chess and checker 'x- may report to his in perts have played professional opponent this .tav - games with the Atlantic Ocean The captains of "2,1 to 31. Jumped checker separating them. 27." many vessels have anntseçl thtni- A game of checkers can be selves playing checkers through carried out by radio in a sur- space with many 'hundred m 1e -. separating them from their -p- prisingly short time. In fact, ponents. if r_cic telephony is used, a Checkers can be played by ra_ti- game can be played within the through the use of either a radio- space of a half hour if the phone transmitter and receiver or plays are made rapidly. With a s ^:ark transmitter, using the reg- Many Games May be Flayed by Radio, and This Sort of Amusement spark systems, where the code ular code. With a 30-watt vacuum Provides a Lot of Fun foe the Owner of a Station. Ca rds, Chess is necessary, more time will be tube radiophone transmitter, games . or Checker Players May Have Their Partners Far Away in Other required, since this method is from to to t; Towns. This Method Also Removes Ail the Inconvenien ces of Re- rot as rapid. However, if only can be played with turning Home Too Late! miles separating the iwo stations. the numbers . are used and a Very little preparation is deeded certain way of reporting moves in the case of checkers. The spaces on the bers from an old calendar and pasting these is standardized, rapid progress can be made. board are simply numbered, starting from on the squares -of the board. Two boards At first thought, the reader may think the lower left hand corner and running must be prepared in this tvay, each with the that it is impractical to play checkers by from left to right until the top is reached. saine system of numbering, and one of these radio. ( little sober -reflection will show This can be easily done be cutting the nunt- is used in each Of the contending stations. (Continued on page 897)

www.americanradiohistory.com 826 Radio News for March, 1922 There's Nothing Too Good for the. Man with Brains By ARMAND C. ROSS -

The Dance Was a Huge Success and Sarr.bo Was the Hero of the Hour. AMBO JOHN ROCKEFELLER .p GEORGE WASHINGTON WHITE, ' - ---- ,... "Lily," or just Sam for short, was operator for the Memphis Colored World, which little publication respected Sam for his knowledge corpulent form dammed the exit. "W'en saw that the object of his collision was of the occult science of Radio. He dat antenily goes up, yoh goes down f" Editor Wheeler of the Journal. was also secretly respected by officers Arms akimbo, her black eyes snapping "Mornin' suh. 'Scuse me, but . I'se a of the white publications, because his suc- fire, Mandy was not one to oppose, except troubled an' sorrowful coon, an' it's gone cessful efforts at getting news and reports from a distance. Mostly distance, and the to mah eyes er sumpin, I guess. 'Scuse far ahead of the wire method used by the little coon backed off toward the rear door. nie." other newspapers had built up the little "W-w'at you mean, Mandy ?" "What's the matter, Sam? You do look World to the extent that white folks were "I means simply dis heah," explained a little pale. One of the children sick? buying the colored paper in preference to Mandy viciously. "Dat Journal onless yo' earns de No death among them, I hope. One dead, the and the other white sheets. money wif dat idiut ray- dee -oh what I earns that would leave fifteen, wouldn't it ?" said Sam, too, was largely respected by Sam. wif my washin' yo' don' nev -ah git to Glut- Wheeler seriously, but inwardly smiling at But Mandy, otherwise known as Mrs. tah -up .de place wheah-.I hangs mah close Sam's doleful visage. John Rockefeller George Washington White, wif no tool contraption, no -way, no -how- "No, suit, Mist' "Wheelah. Aint no sick- respected not Sam, nor Radio, nor his con- sumever, nev -ah! An' whuts mob, if I ness or def. Mah kids is too husky for stant babbling about things Radio. War- heahs one moh ,wurd 'bout it, dis heah roll- dat. And Mandy -Lor' luvus, she won't fare was the result. in' pin's gonna splintah on yoh antennica -so never kick de bucket, 'ceptin' at me l" Now we all know that flatirons may be hand, dàt w'en de amboolence comes, it'll "Well,' Mr. Wheeler. "Can't be any - bounced off our cerebella, dishes may sing take de bump, an' yoall'l haf ter walk. thing so very serious, then. Come on, you Does yo' git. ?" through the air in our direction, hot, and me haven't anything to do until noon. Walk otherwise "I Bits yoh, Mandy, I sho does." up to the office with me and tell me about effective words may flow, but once it.,' the Sam moped out of the room, but just as bug has firmly established itself, it he reached the door he buzzes indomitably, called, "But by Sam agreed. and told Wheeler, as they on often, though, it gollineezer, l'se gonna have dat ant --!" walked along, of the strenuous objection to must be admitted, in secret. He dodged the water bucket, and went his beloved Radio, and of the heated argu- "Sambo John R. G. W. White, of you all muttering down the -,street toward the office' ments he and Mandy had over the aerial don' stop pinesterizin' nie wif dat talk 'bout of the World. in the back yard. puttin' up a old antenizum in mah back "Cain't understan' w.'y Mandy hates mah "So yoh see, suh, ' tain't no use, 'tall," the yand, Ise sho gonna bust yo' haid." puffession so muchly," he mumbled, sighing darky was saying. I cain't try out my new "Sez you. Reckons dat air back yand is and shaking his head. "Lor' but dat woman instrooments, noway. Dey won' let me as much mine as yohn. Who put up dem sho can articumulate. She soun's foh all de down to the TW'orl'..and I cain't 't home, an' poultry fence and dem chicken housen? tvorl' like a rouble o' loud speechers 'hitched I cain't now'ere. Doggone !" and Sam again Didn't I labor there mos' two houahs one onter de end of a leventeen stage amplifiah, lapsed into sad silence. week helpin' dig dat well ?" tellin' what a fohteen .hunderd kilomuwat They walked on a little way, Sam grum- "Yes, an' who done did de washin 's fo' station nex' do is sayin'. An' Lor' .lumme, bling to himself at his fate. Mr. Wheeler to buy de pump an' de hens? 'Sides. we but I'd radder be sittin' under de aerial at was thinking of an article published in his bin a eatin' sand outen dat well evah since. Radio Central wif a pair of sebenteen mil- paper recently, pertaining to a dance given raise you caved in all whut yo' dug out!" lion ohm fones on mah eahs. I knows she's with music via Radio. A sudden idea struck Up to this time no missiles had been jest Muffin', but summerrudder I. cain't seem him. threateningly touched, and Sam, in his in- to convince me of dat w'en she's a standin' "Sam !" spoke Wheeler sharply. dignation, grew bold. dere wif de refrigerator in one han' an' de Sam was startled. "Y -y -yes,, suh. Whut "Mandy, I heahby states firmly and abso- cook-stove in t'uther. Doggone ! DOG - yoh want " tootelooey dat I stahts dat antenny dis after- GON ! ! Whut de-" "Sam; bow much do you earn with the noon, yes or no from youall. Outen my His gloomy musings were broken Taff sud- World?" the editor asked. way. niggah." denly by rough contact with a pedestrian. "Why, de wireless school said I'd get a "Young fellah. lissen heah !" and Mandy's He dodged, but straightened tip when he (Continued on page 9o0)

www.americanradiohistory.com Radio News for March, 1922 827 The Ordeal BY ERALD A. SCHIVO THE monotonous quietness of the then the owner chuckled. "Kluge," the man's voice came from the radio cabin seemed to prophesy some This disturbed the young man. He won- side of his mouth and sounded accusing, impending evil. William Kluge, the dered at the presence of the two men. What "you are an ex-convict." wireless removed the head - could they want? Why did the owner seem The young man was so surprised that operator, him receivers and set them upon the so pleased with himself ? some smoke entered his lungs, causing table before him. He was ostensibly rest- "You wish the reports, sir," said Kluge, to cough spasmodically. The owner, leer- less. Although the cabin was comfortably for want of something better to say. "I'm ing conspicuously, waited for Kluge to deny heated, the young man wiped the perspira- sorry, sir, but the interference, static inter- the accusation. The commander, with cigar tion from his forehead. Try as he would, ference, was so great that I was unable to held firmly between two sets of strong teeth, had keen expectations of a tearful denial. the weather reports . transmitted from the get the signals. I'll have them as soon as coastal radio station were inaudible; the I can get into communication with another "Why -why, Captain," cried Kluge, "you intermittent blasts of static caused the in- ship." couldn't fail to know that. Detectives were coming signals to be muffled hopelessly. The rumble of the fog -horn pierced the always on my trail." 1-Ie lowered his voice Kluge could not concentrate; a question in- silence which followed, and the owner again dejectedly. "Yes, Captain, I no sooner had within my grasp than one of sistently invaded his mind ; it must be an- chuckled. a position inform my employer about my swered : why had he, an ex- convict, been "Never mind the reports," said the cap- them would a felony. You must have chosen operator of the freighter, S. S. Mid - tain bruskly. "Get them in the morning. serving time for way. when other known. Mr. men skilled as Johnston, I saw radio operators you talking with were eluded dis- Muller, a police criminately'? detective, j u s t Kluge was after I was as- troubled. This signed to this- was his first as- ship." signment as a J chnston wireless man, but grinned and mo- his worry in that tioned the cap- capacity was very tain to continue little. His only speaking. difficulty had been "We knew all with the inces- right, K I u g e," sant static which laughed the com- pervaded the mander. "Cer- ether. He could tainly. Kluge, old get the weather boy, what do you reports later. think we hired from another you for ?" ship operator The young man more successful stared with con- than he. It was sternation at the something vague t w o men. His yet of the utmost greatest f ears importance, that were to be real- bothered h i m : ized. The iniquity t h e clandestine of his superior scrutiny of the officer and the captain, the sneer owner was now of the vessel's ascertained. These owner who was men thought him on board and the a criminal. He obnoxious char- decided to change acter of the crew. their opinion im- The long dull mediately. roar of the fog= "Gentlemen, T horn interrupted am innocent of the thoughts of the charge I his agitated mind. served five years Indubitably a mist for." Kluge said liad sprung up. the words with Kluge hated its such straightfor- obscurity. He wardness that the imagined the ves- captain could not sel as a blind say a word, but w o m a n feeling not so the owner. her The Italian Stumbled Over Him; The Man's Hand Fell Upon the Transmi tting Hey, and the Shrill Johnston glared way through Tone of the Spark Coil Frightened the Ignorant Sea man. perilous traffic. at the operator When the noise with unfeigned subsided he was cognizant of the fact that Mr. Johnston and I wish to have a little amazement, he then broke into a loud laugh someone was knocking upon his door. It talk with you." which lasted almost half a minute. might be the commander who had come to "Yes, sir," replied Kluge. Did the men "Oh my !" he guffawed. "He can cer- ask for the weather reports. Kluge was onlÿ wish a pleasant chat with him? He tainly pull it off fine, Captain. He said it nonplussed that his superior should call so thought it improbable. considering the cir- so nice like, that any old woman would be- soon, but the elements were to blame for cumstances. The actions and manner of lieve him." his failure, the wireless set was not efficient the men belied any forthcoming pleasant- Johnston suddenly subsided, remembering enough to counterbalance the deafening ness. no doubt, that time, precious time, was be- electrical disturbances. He hoped the cap- "You do the talking, Captain," ordered ing wasted. tain would understand his excuse and wait the owner.. "I'll help you if necessary." "Come, Captain," he ordered, "get down patiently until communication could be es- The captain muttered something unintel- to business." tablished with another vessel. ligible and reached into a pocket for cigars. This was not the first time that men had "Come in." he called. "Have one," he offered Kluge, "a man can refused to believe Kluge. He was not sur- The captain thrust open the door. Kluge listen better when he's smoking." prised . at the attitude of the owner. He

was surprised to see Johnston, the owner, . Kluge accepted, and soon all three men waited for the captain to continue with the follow the commander into the cabin. Both had lighted cigars. The captain bent for- business. men seated themselves without invitation. ward in his chair and eyed the young op- "I'll give you the facts in as few words They surveyed Kluge with sagacious eyes; erator sternly. (Continued on page 903)

www.americanradiohistory.com 828 Radio News or March, . 192.3

. CIS' IIeparement is open to all readers. It matters not whether subscribers or not. All photos are Judged for best -arrangement and efficiency of the I apparatus, neatness of connections and general appearance. In oreleb,to increase the interest in this department, we make it a rule not to pnbüah photographs of stations unaccompaniedam by a picture of the owner. - We prerer dark photos to light ales. The prize wincing pictures' taust be on prints not smaller than b x 7'. We cannot reproduce pictures smaller than 8Y.. x 8W. All pictures must bear name and address written in ink on Ste back. A letter, of not less than '100 words giving full description" of the station, aerial equipment, etc., must aeeompany the icture& ; PRIZES: One drat monthly prise of .O.da AU ether pioturos published will be paid for at the rate of $8.00. The Plainfield Radio Association Contest Awards of CUPS for Best Home Made Radio Apparatus

THE Plainfield RadioAs- set is built in a solid ma- sociation recently held a hogany rase ` and e. v e r y Radio exhibit in which ` wooden `and metal part is were displayed home made accurately fitted and pöi- apparatus of every kind, as ished. It was regarded as may be seen in the photo- an ex á m'p 1 é <:pf perfect graph illustrating the dis- workmanship that could not play. Three cups were be duplicated in the most awarded for workmanship, expensive ready -mäde sets. efficiency and novelty. ' A Almost ever ÿ" part was type of variotneter to re- actually constructed by place the tickler coil in a either Mr. Taylor' 'or. Mr. DeForest ,mounting, was. Scott. The. parts were pur- part of the equipment given chased by the club. the nec- unusual treatment; this. essary amount being raised Mr. Taylor explained will by popular subscription. convert any DeForest set In, connection with this into a very efficient short - detector and amplifier panel wave regenerative receiver. was shown Paragon RA -ro The special club detector tuner, which was given to and amplifier :panel built the club by Mr.. Scott. for the club by Mr. Taylor Another exhibit by Mr. and D. J. Scott was another Scott, who is one of the center of attraction because Above May be Seen the Varibus Apparatus Entered in the Contest by Members first of the Association. Below are the Prize Winners: Messre. Gibson. Buttfteld, J. P. radiophone fans in this of the elaborate and expert W. Taylor and George Booth, Who Received the Cups Awarded for Efficiency, section, was a carefully workmanship on it. The Novelty and Workmanship. ' (Continued on page 864)

www.americanradiohistory.com Radio News for March, 1922 829 H. Robinson's Station 212R at Keyport, N. J. This Month's Prize Winner

ENCLOSED photograph shows the new equipment now used at station 2QR at Keyport, N. J. On the left is the I -k.w. spark transmitter which is now rarely used since the radiophone and C.W. set has been installed. It is of the DeForest type using rectified A.C. on the plates ; it is used especially for telephony and to broadcast music. In the center, on the table, is a Grebe CR -9 receiver including detector and two -step amplifier to which has been added a separate two -step amplifier. This set gives wonderful results and most of the time it is found that three -step amplification is sufficient to produce very strong signals through the Magnavox, which is on the top of the Radiophone cabinet, or the other loud talkers which may be seen fixed to the ceiling and on the extreme left in front of the spark set. On fhe shelf is a home -made regenerative receiver and amplifier, which has also given excellent results, and a storage "B" battery of the Edison type, which may be switched on either set. A special relay arrangement has been installed near the Radiophone set so as to change all the connections from transmission to reception by means of a single switch; this permits instantaneous change when talking with another station and makes the change, from send to .receive, an easy matter. This relay bearing the contacts of the automatic switch. may he seen Here is the New Equipment of Station 28R, Including New Receivers and Amplifiers Neatly Installed in the on the extreme right. Radio Room Especially Built Under the Aerial. Radio in Porto Rico J. Aausty's Station THE following is a description of my My antenna has a wave-length of 525 perfectly after two years of continuous use. home -made receiving station, the first meters and consists of No. 55 solid copper Only .6 amp. are used for each one. of this style in Porto Rico and the wire, L type. Masts are of bamboo 35 ft. The four binding posts in the base center fourth built by me. high and have been used a long time with are for B battery, making a perfect co5n- good results. bination for different voltages. Contrary to Referring to Fig. 5, the common way, I am using for all work the rack in the top of 45 volts in the detector plate and 22/ in receiver is of the DeFor- the amplifiers. est type, built in a few Jacks and plug were found in an old minuies at a cost of telephone testing set. about so cents. Panel is /" Bakelite XX. Rheostats are All honeycomb coils are Parkin. home - made, including Three anticapacity switches below meter mounting plugs. to the right are entirely home-made. They The coupling control are used to light filament with or without for primary and tickler, ammeter readings_ Center is neutral. The as shown in the left one on the left is to change circuit from panel,. below series-shunt audion to ultra -audion. switch is original, having I am using Baldwin phones now. special advantages over Both nanels are hìinged to base of cabi- others in use. Knobs are nets and can be opened for inspection in one common typewriter second. Grounded shields are used inside knob s. With this ar- of cabinets. rangement fine coupling B batteries are taken from flashlight bat- is done without capacity teries. I have used three blocks since last effects from the hand. July and they are as good as new. All con- The right -hand panel nections are soldered and wire is spaghetti is a detector and two - covered on back of panels. stage amplifier using Reception is accomplished at any time. Marconi V.T: s Nos. I day or night, without trouble with the exception of common QRM from NAU A Good Example of Amateur Workmanship. This Receiver and and I [ respectively. These the Amplifier Were Made Entirely by a Porto Rican Amateur. bulbs are still working (Continued on page 3951

www.americanradiohistory.com 830 Radio News for March, 1922 Station 161E in Boston, Mass.

Th'e accompanying photograph is of the apparatus used at i -BLE, owned by 41- fred Brust, 1289 Massachusetts Avenue, Arlington Heights, Mass., and operated by Harold McNamara. The C.W. set uses four 5 -watt tubes, two as oscillators and two as modulators; Colpitts-Heising system. Power, A.C. rectified by electrolytic rectifiers. Antenna is of inverted L type, two wires 90 feet long and 5 feet apart at a height of 5o feet. Counterpoise, six wires, 5 feet apart directly under antenna. Radiation t/ amps. Can be used for phone C.W. or LC. W. Receiving set is regenerative, 3 honeycomb coils and 2 -step General Radio Am- plifier; can easily copy all districts except sixth and seventh, and Canadian and long wave arcs. . On the receiver may be seen the wave meter which has proved most valuable at all times. NOTE.-This call (r- B.LE.) was formerly Norwich University, Vermont, and has been re- issued. Any cards as to distance will be appreciated. HAROLD MCNAMARA, A Typical Modern Equipped Amateur Station With a Radiophone and C.W. Transmitter Only. ALFRED BRUST. A Luxembourg Amateur Station My new recently built, is station, formation to the newcomers on mounted on my desk, and has a how to make apparatus with the lit- wave -length of from 800 to 25,000 tle obtainable meters. material in this city.. I can receive all the big Today, several amateurs stations of Europe, have good ships at sea, stations which are entirely and even Annapolis, Tuckerton home - m a d e, except, of course, and Marion In the the United States, phones, tubes which and batteries, which come in loud enough to be were bought in France or Eng- heard `all over the room with two land. Several of us have small ttibes.. The most interesting radio - C.W. sending sets, which are also phone' communications I receive are used for telephony. from Paris, Koenigs- wurterhausen My present telephone set is and Amsterdam, which come in equipped with German sending quite clearly. When listening to tubes and a dynamo furnishing 12 these concerts I usually use a two - and 50o volts for the filament in step audio frequency amplifier with the plates -of the tubes. my receiving set which ' has two I expect to do much work with stages of radio frequency. the French amateurs when some of My radiophone set, which I built them have their stations erected, as myself,' is the only one' in Luxem- just recently they were permitted to install bourg,- and I have improved its In Spite of the Little Facilities He Has, Mr. J. Wolff, an European sending stations using a range from 35 miles last year to Amateur, Built Ail His Equipment Himself. Above is an Inside power of too watts in the an- 'so miles. this year. View of Ilia Receiver, While Below May be Seen His Radio Room. tenna on a wave- length of 200 Note the Large Loop Aerial. My -transmitting tube has burned meters. I ani- unable to secure another be- cáitset amateurs here are forbidden to transmit 'hessages, therefore, I am compelled to send -with four receiving tubes. Those who gave me the Erst information -and data for the construction of a station *ere the American soldiers who had a camp in this city in 'ow. A sec - tion of the Signal Corps being in the neighborhood, I - became acquainted with some of the men, and they so kindly helped me out-that after a short whilfe I was able to understand a great deal about Radio. With various German apparatus, which were ,"captured and brought back by the men of the Signal Corps, I built my first station which worked remarkably well. Later, I built new instruments which, added to the former ones, completed my receiving set so that I now have one of the best amateur stations in Luxembourg, Having interested a few friends in Radio, I started the Radio CIub of Luxem- bourg, where, at each meeting, I give in-

www.americanradiohistory.com Radio News for March, 1922 831 Who's Who in Radio No. 14 ROY A. WEAGANT

ROY A. WEAGANT was born anced circuits and wave traps which at Morrisburg, Ontario, Can- choke the static disturbances induced sig- ada, in 1881. He received his in the antenna, leaving only the education at the Stanstead nals to be received free to pass College, Stanstead, Quebec, through the circuits. This is based McGill University, Montreal, on the phenomenon of resonance and and inductive this promi- Canada. He took a course in elec- reaction which from he nent engineer studied in detail. This trical engineering, which is. experiments graduated in 1905, and studied physics the result of lengthy carried out in the most unfavorable under Sir Ernest Brotherford, becom- places Mr. ing interested in wireless through for Radio work; Weagant in Hertzian tried his circuits in various parts of watching his experiments the country during the different sea- waves. sons when the statics were strongest Mr. Weagant took up commercial and troubled the reception of the sig- wireless work in 1908, and in 1912 en- nals in the various Coast stations. tered the service of the Marconi He is actually engaged in research Wireless Telegraph Company of work in vacuum tube circuits for elim- America, where he soon rose to the ination of interference and statics, to position of chief engineer, and when be used in the Transatlantic receiving the Radio Corporation of America stations of the Radio Corporation of absorbed the Marconi company, he America. This indefatigable worker. was retained as consulting engineer. not satisfied with the results obtained The Lieutenant Colonel Liebermann with the instruments he designed, con- Memorial Prize, consisting of the instantly revises the details in order to terest for 1919 on $10,000, and award- improve it and attain perfection, that ed for the best work of the year in is, absolutely eliminate signals and progressive discovery tending toward electrical disturbances from the tele- the advancement of Radio, has been phone circuit of a receiver, so tnat awarded to Mr. Weagant for his dis- only the signals desired to be heard covery for the elimination of static are audible, which thus become read- interference. This prize was founded able even if they are very weak. one year ago by a friend of Lieuten- At the present time, the Weagant's ant Colonel Liebermann, who was static eliminating circuit is used in killed in action in the late World Mr. Roy A. Weagant Consulting Engineer; Inventor of the several of he high power and Govern- War. Circuit. ment stations engaged Mr. Weagant is a Fellow of the In- Static Eliminating in long dis- stitute of Radio Engineers and a for- tance communication for the reception mer member of its Board of Directors and The static eliminator, invented by Mr. at high speed of Press and Commer- Standardization Committee. Weagant, is a combination of bal- cial messages. Splitting the Game By HOWARD S. PYLE LOOK back five years, just before we vacuum tube data, etc., all of which is but spend part time familiarizing themselves entered into the world struggle. a hazy mass, to be straightened out by long with all the accessory apparatus which they Where was the radio game then? experience. control with their keys. The same for the We amateurs were using the old tu- That is why I head this paper, "Splitting arc tenders, and repair and installation men. bular audiotrons (a wonderful de- the Game." Not so many years ago, a tele- Take the radio electricians employed by the tector) together with a slide loose coupler graph operator could, and did, string Government in various Navy yards, as in- often stallers, etc. few know even the let- and a couple of variables. That was the installing and op- Very The regen- his own lines, do his own ter characters comprising the Continental average amateur receiver. only erating, dutes. But erative then available was the one that has besides many varied code. If they were to devote part of their never been beat -the Paragon. Who had soon came the modern repeaters, duplex, time to becoming proficient operators, they a thought of three coil tuners, four prong quadruplex work, and the multiplex ma- must needs fall behind in the progress of bulbs, grid leaks, amateur radiophones, oh, chines. The switchboards of a modern tele- the electrical end of the radio profession. an infinite number of radio instruments, graph office are a meaningless maze to the It is time for a split in our game. We can- which we now number among the common? average operator of today. Consequently, not keep up a 3o to 35 word a minute pace, The war speeded up radio development, re- the commercial telegraph companies have handle Philips' code, "bugs" typewriters "split the game" and now hire operators. and at the same time be up to the minute in markably, but still we have not discarded and altogether the stuff we used a few years plant men. Operators are required to all the latest developments of the radio art. back. Rather than replace obsolete parts be familiar with a typewriter, and pretty They come too fast. Our heads are In a with the newer developments, haven't we well versed in Morse code. Possibly they constant whirl. In the writer's opinion, to just added the new stuff, and consequently are conversant with a simple plug board, maintain efficiency in the radio field, there added to the mass of information which we such as used in branch offices. But the men must be radio electricians and radio opera- must gather, to be up to date in radio? that handle the circuits, and test and main- tors. Not to say there isn't some distinction Imagine a new fan enering the game. Com- tenance ends, are developed from operators now, but it is not officially recognized. to that specialized purpose. Note that by Take the new license examinations. They pare him to those who entered some five or far six years back. Then the evolution of a the great majority of wire chiefs are require a considerable knowledge of the radio operator consisted of breaking in at of the old- timers; they have grown with modern radio apparatus, and have raised the the crystal and tuning coil stage, with a the game. They still can handle a key, but code speed also. Of course that puts radio spark coil transmitter, and progressing they do not work a regular operating trick. operators on a higher plane; they are rec- to Many the loose coupler and audiotron with a non - of them would be lost on a fast Phil- ognized as being more of specialists than in synchronous rotary transmitter; just a few lips' press wire today. But they do know the old days, but take an examination for intermediate steps involved. the electrical end of their game. They must. an extra first -grade license. You must be Now the comparison : We have many a highly But now ! Either our new "bug" must specialized radio electrician, and start as before, with the crystal and fast commercial radio circuits, working familiar with arc. spark and tube sets. In tuning Transoceanic and Transcontinental toddy. coil, addition, you must be a competent radio and slowly and painfully climb to the They require speedy Continental operators, telegrapher at present stage of radio development, 3o words a minute, and a doubt- and men who are familiar with typewriters Morse man at 25 words; a jack of all trades less to find it several steps ahead by the at the working speed of such circuits. They in that particular line. It is all right, per- time he reaches the present stage, or he must devote their time to keeping up the haps; we appear to be getting j y, but it must enter with his head crammed full of gait they are required to hit. They cannot (Continued on page 860

www.americanradiohistory.com 832 Radio News for March, 1922

SINGLE CIRCUIT REGENERATIVE NO RESULTS. aerial for receiving, the surrounding ob- SET. (334) J. Shannon, of Bridgeport, Nebr., jects not being over 35 ft. high? (332) Charles W. Flichman, Jr., of Bal- would like to know : A. t. A good aerial could consist of timore, Md., asks: Q. t. I have a single wire aerial 35o ft. four wires 8o ft. to loo ft. long, spaced 3 Q. 1. Please publish a hook -up of a long erected r8 in. below the phone wire ft to 4 ft. apart, erected as high as possi- single circuit tuner to receive wave- lengths on insulators 15 ft. above the ground. I ble. The lead in could be taken either up to abolit r,000 meters, with data for the have been unable to receive anything on from one end or from the center, making construction of inductances. this aerial; does the phone line interfere? it an L or a T aerial. A. r. The hook -up for this set appears A. r. It is difficult to answer this ques- Q. 2. Would I be able to receive con- on this page. The winding of the induct- tion, as you do not give any details regard- certs from too miles with a loose coupler, ance in the aerial should consist of about ing your receiving set. If you use a good mineral detector, variable condenser and a 16o turns with taps every 15th turn. The receiver with a vacuum tube detector, you 3,000 -ohme head set. variable condenser should have a capacity should receive signals with this aerial, un- A. 2. Under good conditions, you may of .cor m.f. and the phone condenser, of less you use too much inductance in the be able to hear some concerts, although .0005 m.f. The tickler coil in series in the primary and cannot tune down on short we are afraid you are too far away to get plate circuit should rotate one -half a turn wave -lengths. You should try a variable good results with a mineral detector, in condenser in series with the primary of receiving radiophone transmissions. your tuner and also to attach a shorter wire in another direction to see if any sig- A RECEIVING SET. nals are received on a different antenna. (337) A. Norman Goebel asks: If you fail to hear anything, most prob- Q. 1. By whom is the crystal receiving ably the trouble lies in your set. set, described by A. Henry in the January Q. 2. Is 12 llllllll a No. galvanized soft iron issue, made? wire too ft. long running underground and A. r. This set is manufactured by F. A. soldered to a well- casing, a good ground? D. Andrea Co., 1882 Jerome Ave., New A. 2. Yes, this should constitute a good York City, N. Y. ground. --o Q. 3. Could I use the voltage from a GRID LEAK. 32 -volt lighting battery for the plate voltage (338) Melvin Bergland, of Joyce, Iowa, o o- of radiotron tubes, taking only the proper asks : voltage for the detector? Q.t. Where can I obtain a to,000 -ohm A. 3. Yes, this is quite feasible and grid leak to be used in a radiophone trans- ©RHO/O News /927 should work well. mitter? 0332 A. I. You will find, in the advertise- This Single Circuit Regenerative Receiver May ELECTROLYTIC RECTIFIER. ments in this magazine some grid leaks of Easily be Made by the Average Amateur. any resistance for the purpose you men, (335) Louis E. Metcalf, of Greenfield, tion. We suggest that you look over the Ill., writes as follows: advertisements. inside, and at one end of the main induct- Q. 1. Can an electrolytic rectifier, as a wooden rotor Q. 2. Please tell me what the apparatus ance, and should consist of described on page 201 of the September is- represented wound with 6o turns of No. 28 wire. in the sketch I enclose is. sue, be used successfully on a three -stage A. 2: The instrument Q. 2. Are .eor m.f. variable condensers represented by amplifier, without giving too much hum in your diagram is a high tension dynamo suitable to be used across the primary and the phones? secondary coils of a honeycomb receiver? A. t. It would be difficult to use such A. 2. Yes, this capacity is quite suitable. a rectifier to supply the plate voltage to a three -stage amplifier, without hearing any INDUCTION TROUBLE noise in the phones. However, if a detector and one -step only were used, we think E. E. of New Baltimore, (333) Straffon, it would be possible to use such a rectifier, Mich., wants to know : provided the rid proper smoothing circuit com- Q. r. Is there any way of getting posed of capacities and choke coils is used. of noise from a converter used by the the Q. 2. Can such a rectifier be used to Telephone Company, which is heard in all charge a storage battery? the radio sets in town? this A. 2. An electrolytic rectifier can be A. 1. To eliminate the induction effects used for storage you charging batteries, but it caused by the converter mention, we should be of suggest hook -ups a different size than the one that you try the published you mention. The cells should be on this page, which may help you to cut very much larger, so should be the plates in or- the noise you ©RAD /0 Nervs ,szz out hear. der to carry safely four or five amperes. Q333 Q. 2. I am using a Remler two -step am- Q. 3. For phone reception, should a con- If You Are Troubled by Induction From Power plifier and a Clapp -Eastham regenerative denser be shunted across the grid vario- Lines, Try These Circuits. set, how can I cut out the squealing I meter and secondary of an Armstrong re- sometimes hear in this set? generative circuit? A. 2. It is difficult to locate the trou- furnishing the plate voltage to the trans - A. 3. It is not necessary to shunt the ble your circuit, without ac- mitting tubes. in detector secondary and grid variometer of such a tually seeing your set, but we believe the set, if the receiver can tune the wave RAC3 squealing is caused by a loose connection, length which is desired receive. TUBE incorrect condenser, it to In value of grid leak or case the wave- length is beyond the range (340) Garrett S. Parsons, of Romney, in your "B" battery. You : or by a bad cell of the set, a small variable condenser may W. Va., would like to know in your should also verify the connections be connected so as to increase the tuning Q. t. What is the best hook -up for one amplifier and make sure that all the con- range of the apparatus. Myers tube made by the Radion Audion nections are tight. Co.? Q. 3. What is the wave -length of an A. t. This type of tube may be used in aerial 45 ft. long, 70 ft. high, composed of RECEIVING AERIAL. any standard circuit. We suggest that you three wires 3 ft. apart inverted L type? (336) Edward Wilker, of Saugerties, N. look over the back copies of this maga- A. 3. The wave -length of such an aerial Y., asks the following: zine, in which you will find very efficient is about 15o meters. Q. t. What is the most efficient type of circuits.

www.americanradiohistory.com Radio News for March, 1922 833 RADIO DIGEST USE RADIOPHONE TO SEND on agricultural products, and the wireless Officer, Headquarters Company, 71st In- WEATHER FORECASTS AND station of the Post Office Department is fantry, New York National Guard, Park WARNINGS. part of the air mail service. The reporters Avenue and 34th Street, New York City. Beginning with January 16, the air mail of the Department of Agriculture operate radio station in the Post Office Department from branch offices of the department WESTINGHOUSE ELECTRIC ES- at Washington has been broadcasting which are connected with each other and TABLISHES RADIO BROAD- weather forecasts and warnings of the with the Washington office by a system of CASTING NEWSPAPER. Weather Bureau, United States Depart- leased telegraph wires, and the daily mar- Radio Broadcasting 1V'eras, a weekly ment of Agriculture, by radio telephone in- ket news is flashed over these wires to the newspaper, has been established to mark stead of by radio telegraph. These reports various branch offices for immediate re- the first anniversary of KDKA, the radio are sent out for the District of Columbia, lease to the public. telephone broadcasting station of the West- Virginia, Maryland, Nest Virginia, East- The leased -wire service does not cover inghouse Electric & Manufacturing Co., at ern Pennsylvania, Western Pennsylvania, territory in the Southern States, and it is East Pittsburgh, Pa. and Ohio. ln sending out this information, thought that the new wireless broadcasting The newspaper is believed to be the first a wave -length of 1,16o meters is used and service will meet a long -felt need of south- of its kind in the United States and the all receiving instruments as far west as ern growers for national market news. only one devoted solely to the publication Ohio, if properly keyed, may be used to re- of news concerning the activities at one ceive the reports which will be sent out at AN OPPORTUNITY FOR EXPERI- broadcasting station. to a. m. and at 9.5o p. m. Experience has ENCED RADIO AMATEURS. About one year ago, the Westinghouse shown that the radio telephone gives better The National Guard of New York State Electric & Manufacturing Co. broadcasted and more rapid service than the radio tele- which, offers to its members several advan- its first program from KDKA, which was graph. the first station in the world to give nightly broadcasting programs. Interest in the pro- MARKET NEWS NOW SENT TO grams became so great that, in the latter EASTERN STATES BY RADIO Radio Articles Appearing months of 1921, there came to the company FROM WASHINGTON. an insistent demand on the part of "List- in the March Issue of eners in" that they be informed "in ad A radio market news service designed to vance" of the programs to be broadcasted keep agricultural interests within a boo -mile Science and Invention from KDKA. uadius of Washington informed daily on The Radiotrola The Wireless With this demand -good naturedly given, rational market conditions respecting live - insistent Broadcasting News grain and Phonograph. With full details and yet -Radio stock, fruits, and vegetables, was born. Today, with only a few issues products, was recently established at hook -up of apparatus employed, for dairy cff the press, it is a fixture. has come by Depart- V. T. detector and four -step ampli- It \\ ashington the United States to stay because public opinion has de- ment of Agriculture. This service covers fier. By H. Gernsback and R. E. Lacault. manded it. The birth of this newspaper nearly all States east of the Mississippi one of the many great forward steps have been heard in Wire. marks River. The messages Talking Over a Trolley in the marvelous history of the advance- Texas. The 'Washington wireless station of Combined radio and wire system. ment of radio broadcasting. the Post Office Department is used to dis- Shall I Take Up Engineering? In- Radio developments are the chief items patch the reports. cluding electrical and radio engi- published in Radio Broadcasting News, A report showing the prices that retail- neering. Described from the view- which derived its first circulation list from ers pay wholesalers for fruits and vegeta- point of the prospective student as those friends of radio broadcasting, who, market is also bles in the Washington well as the parent. By H. Winfield after "listening in" on the KDKA pro- broadcasted by radiophone, 1,16o meters, Secor. grams, wrote to the Westinghouse Com- a radius too miles or more, at 1o.3o over of Radiophoning to and from "L" pany expressing appreciation of the broad- a. m. daily. Trains. casting service. A report giving the day's receipts of cat- The gives in word and pic- the ten prin- Radio For the Beginner -No. 1 of publication tle, calves, hogs, and sheep at ture news concerning various broadcasting cipal live -stock markets throughout the a series. How to buy and install a receiver. By Armstrong Perry. programs and pictures of artists who en- country, and a brief message on the open- A feature of Louis hog mar- Commercial Radio tertained radio enthusiasts. ing of the Chicago and St. Amateur vs. each issue is the program to be broad- 12.3o m. A graphic kets are broadcasted at p. com- Stations. Describing with casted nightly during the week following in the work done by plete report of conditions and prices chart the wonderful the date of issue of the newspaper. St. Louis live -stock is sent at set compared to Chicago and the small amateur It is estimated that more than 6o,000,000 2.30 p. m. Prices of fruits and vegetables the huge commercial stations in persons are within the range of the four in the ten principal consuming markets are transmitting across the Atlantic Westinghouse broadcasting stations, the p. m. A report of con- dispatched at 3.30 Ocean. calls, wave lengths and locations of which ditions and prices on butter, cheese, eggs, are as follows : KDKA, 36o meters, East New York and 11 111 and dressed poultry at Chi- Pittsburgh.; KYW, 36o meters, Chicago, cago is broadcasted at 5 p. m. At 5.30 p. Ill. ; WJZ, 36o meters, Newark, N. J. ; and mn., a press dispatch on the Chicago grain tages, such as the t-se of the gymnasium, run- WBZ, 36o meters, Springfield, Mass. market is sent. A complete report on the bowling alleys, billiard rooms, library, The program broadcasted nightly by the Chicago grain market, giving closing future ning track, comfortable club rooms, etc., Westinghouse broadcasting stations include and cash grain prices, is dispatched at 7.3o needs the services of about 20 Radio oper- concerts, church services, results of vari- p. 8 p. of the m. And at m. a complete report ators to fill the technical grades for ous games of sport, market reports, stories quotations on fruits and vegetables in the Radio section of the Headquarters Com- for children and news bulletins. leading consuming markets is sent. In pany of the Regiment, which is located at reports, Copies of Radio Broadcasting News will broadcasting all radio telegraph the 71st Armory, situated at Park Avenue be sent to all persons desiring to receive except the 7.30 p. m. and 8 p. m. messages, at 34th Street, New York City. The duty the newspaper who send their names and is used. The 7.30 he 1,98o meters, tube C.W., required of each member is that present addresses to the Editor, Radio Broadcast- p. m. and 8 p. m. messages are sent on 2,500 himself one night a week for drill, and ing News, Department of Publicity, West- meters, arc C. W. once in a two nights a week for while inghouse Electric & Manufacturing Corn - The department's broadcast service vir- regimental parade and drill. Each man re- pany, East Pittsburgh, Pa. tually completes the chain necessary to en- ceives, in addition to that for the regular able all agricultural interests in the United weekly drill, pay amounting anywhere be- SEATTLE RADIOPHONE States, wherever located, to obtain daily tween $1 and $2.50 per drill. IMPROVED. information of conditions and prices in the On the top of the Regiment tower is in- national agricultural markets. The service stalled one of the finest Radio stations in By Howard S. Pyle. entails no additional expense to the Gov- the City, which is used every drill night The radiophone which has been op- ernment inasmuch as existing market re- for instructional purposes and consequently erated on a nightly broadcast schedule by porting agencies and wireless broadcasting experienced hand'.ing is required of the the Seattle Post- Intelligencer, a morning facilities are used. members, who are taught by instructors daily, has been recently improved by the The Department of Agriculture already both theory and practice of Radio to addition of two Too -foot masts, on the roof maintains at important shipping points and enable them to qualify for operators. of their building. These masts will re- consuming centers a number of market re- All those who are interested should ad- place the m+'ch shorter ones formerly used, porters to report daily conditions and prices dress, for further details, Commanding (Continued on page 86o)

www.americanradiohistory.com 834. Radio News for March, 1922 Correspondence from Readers RE. CHOKE COIL AMPLIFIERS. dynes the other, thus making the signals generally take his Navy Press, when these Editor RADIO NEWSS readable on a crystal detector. Mexican stations with waves as broad as Referring to your December number- None of the instances I have quoted in a barn door will stay out. Mr. Jessup's article on the choke coil am- my article are based on any guesswork, nor NAT, NPL, NPX and NPG (on medium plifier, his assertions concerning its supe- have I jumped at conclusions. have waves) all come in well. I can copy KET riority hold little weight, due not only to worked at telegraphy for many years under any evening after sundown, and along about the fact that he gives no details concerning all sorts of conditions, and I never note any 9:oo P. M., if they are working "dux," the transformer coupled amplifier with radio station as having been heard by me, can bring in both KET and. KIE together which comparisons were made, but also to until I have heard him "sine" several times, (by proper adjustment of second con- the general principles which underlie vac- so that I know who he is, beyond the denser), hear them sending to each other. uum tube amplifiers. shadow of a doubt. and hear when they break each other. This Amplifiers may be divided into two gen- I have no transmitting outfit, and conse- breaking, however, does not occur very eral classes, voltage amplifiers and power quently have devoted my attention exclu- often, for the boys on that circuit are some amplifiers. It may be shown mathematically sively to improvement of receiving condi- artists, and the way they shoot those ten - that for maximum power amplification the tions, the following being some of the re- letter code "Japs" into each other, when impedance of the output circuit of a tube sults. they get warmed up, is a caution. should be equal to the plate resistance. It With an ordinary galena hook -up I bring So much for spark stations, and now I may also be shown that, when the output in the following amateurs whenever they come to a phenomenon: I am frequently able to copy impedance is largely inductive reactance and are working : WSO, WII, NSS, and occa- is about four times as great as the plate re- sionally NPL, NPG, NAO, NAT and NBA, 5EA (Baton Rouge, La.), 5EF (Mc- all of them C.W. sistance, the voltage amplification is about Alester, Okla.), 5HK and 5HL (Oklahoma stations, on GALENA, 90 per cent. of the maximum obtainable and even once, when WSO' and WII were City), 5ZL (Little Rock, Ark.), 5ZS both running idle with a given tube. The thermionic tube is Pike, for a few minutes, plainly (Shreveport, La.), 5YH (Camp heard POZ calling and signing. a potentially operated device, so we must Ark.), also many other intermediate Fifth I know impress as great an alternating E.M.F. on this sounds "fishy," but it is a fact, and I District stations, and have several- times had no tikker, or any sort of the grid as possible without working the heard the (to me) unknown ones, 57A, auxiliary what- tube off the portion of its charac- ever, and I also get their true tone. What straight 5JG, 5JI, 57D and 5IF. teristic curve, causing harmonics and dis- 5JS, use have I for a V.T.? tortion. This potential may be obtained by In the ninth I get 9AEG ( Eldorado, I have two aerials, one 9LR, of three wires, operating the preceding tube or tubes as Kas.), very QSA, 9BW, 9EL, gHI 5 ft. apart, Too ft. long, 6o ft. aboveground, voltage amplifiers, or by the use of an input and one single wire Soo ft. long. These can transformer of sufficiently high ratio. Low be used either separately or both together ratio transformers do not work the tubes to as one by throwing one switch at the in- highest efficiency, because they do not take Some of the Articles strument table. Ground is 300 feet of elec- advantage of the entire length of the char- tric light No. io "outside" copper wire, acteristic. This straight portion is, of Appearing in the March buried about a foot in marshy ground. course, longer at high plate potentials. Issue of Practical Electrics Receiving instruments : small DeForest variocoupler It should now be clear that if a "choke Electricity from Fruit and Vegetables. for Zoo meters, Navy Type coil" amplifier is designed as a voltage am- loose coupler for 302 to 4,000; large bank plifier, the equipment is put to a purpose By H. Winfield Secor, Assoc. wound loose coupler for i,000 to 15,000 M., that could be accomplished as well by a Member, American Institute of and DeForest three -coil mounting for any high ratio transformer. On the other hand, Electrical Engineers. wave -length. if the chokes have an impedance equal to Early Electric Motors. By T. I made an eight pole, four throw rotary the plate resistances of their respective switch, with which I can instantly cut any tubes, the result is practically a power am- O'Conor Sloane, Ph.D. one of the four receiving sets into the re- plifier with 1 : i transformers and all the Portable Automatic Traffic Guard. ceiving circuit. benefits of transformer voltage amplification Location are lost. The Electric Weeder. 300 miles west of San Antonio, 225 miles east of El Paso, Texas. Let's I employ a 25 : I transformer in the first Loud Speaking Telephone and Its hear some other galena records. stage of my power amplifier and a slightly Practical Applications. GEO. C. HASELTINE, lower ratio in the second, 200 volts being Fort Stockton, Texas. used on the plates. Fluctuations in the phone circuit as great as so milliamperes are obtained on some signals with this com- 9ND, 90E, and 9SZ (all Kansas stations) ; DID YOU HEAR bination. . I can say from my own expe- HIM? rience with choke coil coupled amplifiers 9AFX (Stromsburg, Neb.) ; gHN, 9EQ, Editor RADIO NEWS : that tube for tube results are not com- 9JQ, and 9KV (all St. Louis calls) 9ZQ the and 9JN (Ames, Íowa). Alva parable to a correctly designed transformer (Oelwin, Iowa) Smith, operator at Radio 9DMA, two steps 9JN comes in very plain and clear ; also the Caledonia, Minnesota, wishes to hear from coupled amplifier, and that beyond all of the latter, amplification should be radio following unknown "9s": 9BEM, 9DE, those who have heard his spark signals. 9YI, and 9ZB. Have also heard 9VA (Chi- He is using a -K.W. and is getting four frequency. amperes, / KENDALL CLOUGH. cago) when the QRM lets up long enough. but has received no reports from Chicago, Ill. In the sixth I hear 6IG (Douglas, Ariz.) over 18 miles. All reporting will be sent every night, and when not too much "CQ "- radio literature free. Pse QSL. ing, etc., frequently hear 6CO (San Jose, ALVA SMITH. C.W. ON GALENA WITHOUT Calif.) and 6CG (Berkeley, Calif.). TICKLER! I also hear the phone at Catalina Island SOME RECEPTION quite often (790 miles air line distance). Editor RADIO NEws : So much for short -waves, bearing in mind Editor RADIO NEWS : Having just received back numbers of that all. this is on galena. Thinking the following may be of some your magazine for nine months that I had Coming higher, I can copy ships ah over interest to the amateurs, I have decided to missed, have started to read up to date. the Gulf waters, also all along the Pacific write to you. coast, from Upon reading Mr: Boucheron's article on San Francisco to ',Soo miles I. receive the radiophone at Long Beach, page 548 of the April, 1920, issue, I am par- south of there. Calif., the one that connects the mainland he says in ticularly impressed with what I quite often, for practice, copy XDA's with the Catalina Islands ; I can duplicate regard to few amateurs paying attention to "Prensa" on my noisy typewriter without this reception any good night. It came in effective reception of 200 -meter wave- any difficulty, as he comes in strong, and very clear the other night. I tuned the sta- lengths, and I will give . some examples of by the way, if you want to be operators, tion in at ío:29 P. M. Eastern time, Pacific what is possible along these lines. sit in and copy him through some night, time being four hours earlier. I have been As to getting arc stations on an ordinary and you will know you are sure enough receiving this station almost every night. I galena hook-up, this has been very cour- ops. if you copy him without slipping tap, as use a Grebe CR -3 and a type RORF de- teously explained to me by Mr. Elmer E. he uses the Spanish n. the Spanish a, the tector and two -step. I hear the station on Bucher, who says that when two or three Spanish ch and the German o. the detector very loud. are working at the same time this is pos- WNU and US both come to me fine, and WESLEY ROBINSON, JR. sible, owing to the fact that one hetero- I get "time" from NAA every night and St. Mary's, Georgia.

www.americanradiohistory.com Radio News for March, 1922 835

WIRELESS CLUB OF ST, PETERSBURG, FLA. have every amateur in Norwood and vicinity assistant secretary-treasurer, Emil Klob, McKees- The first meting of the Wireless Club of St. join soon. port. Petersburg, Fla., was held on January 20. Twen- On the first and third Tuesdays of the month Four permanent committees were elected to ty-two charter members were present and the we have code classes and on the second and promote the association. These were the Tech- following members were elected to office: E. fourth Tuesdays we have business meetings. nical Committee, the Membership Committee, Pub- Richard IIall, president; E. B. Maclung, vice- We have a trade bulletin and a question box. licity Committee and the Constitution and By- president; Wilbur Worly, secretary and treasurer. Two of our most experienced members, Mr. Al- Laws Committee. These committees went to work The leading business men of the city are well fred Tucker, 8BNR, and Mr. Clarence Wright, immediately and the membership began to slowly represented in the membership of the club which SAHX, endeavor to answer all questions that the climb. Meetings are held every two weeks on has increased to 32 members since the meeting rest of the "hams" have to ask. Thursday evenings. The place of meeting is at and they are all enthusiastic boosters. The city "I-Iams ", "O. \V.'s" and "O. M.'s" living in 427 Olive Street, McKeesport, Pa. may install a large broadcasting station as a re- Norwood and surrounding suburbs join us at At a recent meeting the president and secretary - stilt of this. our next meeting. treasurer were re- elected At the present time all outside traffic is being Other clubs or organizations please do not for- A few of the organizers of this club were the handled by Mr. Hall, 4JY, who is also the city get to write. Address Arnold H. Westhaus, 1942 organizers of the old Western Pennsylvania Radio manager for the A. R. R. L. It is due to his Elm Ave., Norwood, Ohio. Society which merged with a radio club front untiring efforts that the city is taking up the McKees Rocks, Pa. Titis society then adopted l.roposition of installing a large broadcasting sta- 1F3I the name Radio Engineering Society of Pitts- tion Owing to a recent change of the call 1FMI burgh. Later this society was incorporated and The club is going to give prizes of power tubes which is listed under the naine of John Marshall, is now very active in the radio circles in the and C.W. articles to the most progressive men J Sherman St., Portland. Ole., to the Portland district. in these lines, phone, I.C.W. and C.W. We hope Y. M. C. A., Portland, Me., it is requested that A short time ago the Mon -Tough Radio Asso- to make this a "sparkless" city. We have the all amateurs please change their call books ac- ciation made application to A. R. R. L. and be- Naval station NGL here, but instead of being a cordingly. came affiliated, It is striving to become .active in hinderance it is the greatest aid we could have The Y. M. C. A. also has a class of radio the radio circles. The Technical Committee has and the station is manned by as fine a group of amateurs which meets every Monday night. The been putting on technical talks for the members. men as will ever be found in any naval station. radio room is fitted up with code tables on These are enjoyed very much, as the majority of Any member of this club who is found to be which many things can be performed. such as the members have little knowledge of the new operating his transmitter on a wave -length of over listening in with operator on watch and using science. 200 meters, is to be fined $5 for each offense; tables separate for code practice or they can all The association will welcome any correspond- all men must agree to this before they can be- be connected together. These tables are con- ence with other clulbs throughout the country. come members. It will be enforced. trolled' by a switchboard about 14x10, which has Address the Publicity Chairman, 427 Olive St., Address all correspondence to the secretary, 11 switches on it. A class in theory is also con - McKeesport, Pa. Mr. Wilbur Worly, Wireless Club of St. Peters- d ucted. burg, P. O. Box 1188, St. Petersburg, Fla. Recently a 1 K.W. spark transmitter was in- RADIO CLUB OF THE CITY OF ITHACA stalled and is giving excellent results. All ama- The first meeting of the Radio Club of the PHILADELPHIA AMATEUR RADIO ASSOCI- teurs hearing this stator: are requested to write City of Ithaca was held January 19, at the home ATION to the operator and instructor, I-I. C. Sever, care of Mr. \Vm. Bostwick. Officers of the club were The Philadelphia Amateur Radio Association Y. M. C. A., Portland, Me., giving full partic- elected as follows: Prof. William Ballard, of held its last meeting on January 16, 1922, in the ulars as to tone, wave, whether Q.S.A. and Cornell University, honorary president; Mr. Win. Widner Memorial Library, 1200 North Broad O.S.S. or what E. Bostwick, 8ACAI, acting president; Mr. David St. Mr. E. B. Meyers, of Jersey City, N. J., A regenerative and two -step are now used and Sinclair Perry, SOO, vice- president; Mr. Fred read a paper on "Vacuum Development Front 1884 later a three -step will be installed. Burnham, SNI, traffic manager of this locality; to 1922 ". This paper was very interesting and C.W. will soon be put in and will be used with Mr. Dexter S. Kimball, Jr., SBEV, secretary - attracted a large attendance. Mr. Meyers also spark set. A motor generator supplying A.C. is treasurer. A radio adviser is to be chosen at the exhibited a six-step amplifier macle of the Meyer used, owing to D.C. being in the building. Will next meeting. It is the duty of the adviser to vacuum tubes and choke coils. This was followed Q.S.L. all cards and letters. inspect transmitting stations at the request of by a talk by Mr. Charles A. Service, presenting the operators and tune them properly. the interests of the Third District Convention at LANSDOWNE, PA RADIO ASSOCIATION The purpose of the club., to quote from its Washington, D. C., on February 17 and 18, 1922. Our association was organized on Jan. 29, 1921. constitution, is "to advance the local amateurs A plan was presented, to the effect that mem- On that date our membership was composed of along radio lines and to cope with the interfer- bers could bring any apparatus that they wished seven charter members. ence." The meetings are to be held the first and to dispose of and the club would offer it for sale At present we have increased to the number third Wddnesdays of every month at the homes during the meeting. The attendance was so to 20 members. Mr. J. O. Holtby, 3BIF, has been cf the members. As to membership, any person large that some had to stand, as the seating ca- president since organizing. owning or intending to own a radio set is eligible pacity of the hall was not large enough to ac- Our clubrooms are located at 18 North Wy- to membership; however, the members are classi- commodate all. combe Ave., Lansdowne, Pa. fied as senior members (licensed), and junior We meet every Tuesday night, at S:00 P. M., members (unlicensed) and the club will attempt to TOLEDO RADIO CLUB in said clubrooms. Visitors are cordially wel- get as many transmitters licensed as possible. Radio amateurs of Toledo have formed a radio comed and correspondence is invited by the sec- The following traffic schedule was decided upon organization, the name of which is the Toledo retary. for this locality: 7.00 A.M. to 12 M. air is free Radio Club. At one of our meetings we brought up the dis- for transmission and testing; 12 M. to 2.00 P.M. At a meeting held in November, the following cussion that we have club stationery, which is long distance relay work. ,2.00 P.M. to 7.00 P.M. officers were elected for the year: President, A. now in use. air free for transmission and testing; 7.00 P.M. T. Gogel; vice -president, Clark J. Taylor; secre- We have four licensed members, 3BIF, 3AVL, to 9.50 P.M., local transmission, testing and DX tary, E. E. Pearson; treasurer, Earl Ensign. 3ANH and 3BAL, of which three have phone work forbidden; 9.50 to 10.10 P.M., no transmis- Four meetings have been held with an average sets. We have two important committees. sion; 10.10 P.M. to 7.00 A.M. long distance re- attendance of 30 or 35 fellows. Meetings are Our library consists of "Science and Inven- lay work. held the first and third Wednesdays of every tion", RADIO News and "Q, S. T." and a variety Inasmuch as the club was but recently organ- month at the Toledo Commerce Club rooms in of radio books. ized, no lectures or tables have been arranged the Nicholas Building. Special program com- The club set consists of % K.W. spark and an on radio subjects, but the matter is to be done mittees are appointed and a certain program is efficient receiving set also a C.W. set is under up in good style so that members of the club arranged for every meeting. construction. will increase their knowledge as rapidly as pos- The club has held a prize contest in which the Address communicaCons to above mentioned sible. person molto stade the cheapest and most efficient address. club is very desirous of communicating crystal receiver received a tube and panel do- with other clubs and will greatly appreciate a nated by the Kuchler Radio Co. of this city. line telling what other organizations are doing. set of 56 phones CORRESONDENT WANTED The second prize was a Murdock Would any member of some club be willing to All communications may he addressed to Secre- donated by the W. B. Duck Co. Considerable tary D. S. Kimball, Tr., 5 Central Ave., Ithaca, local and correspond with me in Esperanto on radio? interest is being shown by amateurs, K. Lundquist, Makasiini katu G rapp: N. Y. Let's hear from you! it club will grow into a real Pohjois, is hoped that the C. H. 14, Helsinki, Finland. live organization. Anyone desiring to communi- the secre- MORNINGSIDE RADIO CLUB, SIOUX CITY, cate with the club can do so through IOWA tary, E. E. Pearson, 515 St. Louis St., Toledo, O. ROSELLE PARK RADIO CLUB At the meeting of the Roselle Park Radio Club, A radio club for the benefit of the residents of NORWOOD RADIO ASSOCIATION, NORWOOD, held January 12 in the new clubrooms in the Morningside, Sioux City, Iowa, was formed last OHIO Tuthill Building on Chestnut St., the election of September by several amateurs of the city. club now totals 15, On November 8, 1921, the first meeting of new officers for 1922 resulted as follows: The membership of the and the Norwood Radio Association was held at the President, Robert II.. IIorning, 2KK; vice- presi- considerable interest has been shown by the mem- home of Mr. Alfred Tucker. The following of- dent, Gus Bosler; secretary, Charles A. Reberger; bers, several of whom are prominent amateurs of ficers were elected: treasurer, H. T. Ryder; traffic manager, Howard the city and have made sonic real records in trans- President, Alfred Tucker, SBNR; vice -president, Luttgens, 2BCC; assistant traffic manager, Mar- mission and reception. The club was formed for Carl Brinkman; secretary, Martin Ross; treasurer, vin C. Lane, 2BTM; radio inspector, Paul Lar- the purpose of popularizing radio. Demonstrations Mr. Ross lias resigned his sen, and assistant radio inspector, Cunard Hag - have been given on several occasions and proved a Curtis Clements. of citi- office and Mr. Arnold H. Westhaus is now taking berg, 2BCP. real success, having won over several the his place. zens to the realm of radio. Linden and MON-YOUGH RADIO ASSOCIATION As yet, no transmitting set has been installed, The club now has a clubhouse at of Kenilworth_ Sts., South Norwood, and intends to Late last August a few radio enthusiasts of but the club is contemplating the installation a and receiving set in the near this vicinity had a meeting and organized the 10 -watt radiophone, C.W. and I.C.W. transmitter, have a transmitting The location of clubroom is ideal, being on future, as well as a battery charger and several Mon -Tough Radio Association. An election of the will be of benefit to every officers ensued with the following results: the top floor of the East Junior High School, which other instruments that 65 feet with a length of member as well as to the club. President, James G. Parson, McKeesport; vice- makes the aerial about high Radio Association started with ores/dent, John S. Hunter, Duquesne; secretary - about 150 feet. This aerial is now used for the The Norwood (Continued on page 900) 11 members and now has 20, and we intend to treasurer, J. C. Dunn, East McKeesport, and

www.americanradiohistory.com 836 Radio News for March, 2922 How to Make a Radiophone Receiving Station (Continued from page 824) or twelve dollars, as some of these people A. very convenient and satisfactory form of long; two binding posts seem to believe. or battery connec- lead-in insulator is found in a porcelain tors (almost any kind will suffice), and Every now and again there appear de- tube. The tube may either be scriptions passed about zoo feet of insulated wire. The wire of some youth who uses his bed through a hole drilled in the wall or the may be enamelled single spring or a fire- escape or double cotton or even the frame window frame and the lead -in wire is or silk covered and may of an umbrella for receiving radio range in size mes- passed through the tube. from No. 18 to 24 B & S sages. That is quite gauge; No. 22 possible, but it does It is sometimes more convenient to 13 & S is not mean use preferable. that all you have to do to listen two shorter wires instead of a single long With this material it to stations in Europe is but necessary to is to open an um one. In this event two wires, 50 or 6o proceed according to the directions indi- brella, stick a pin in a piece of coal and feet long and 3 to 4 feet apart will suffice. cated in the illustration. It is sometimes hear all that is going on. Bed springs and Almost any arrangement of the wires will more convenient to purchase a slider from small coils of wire have been used to pick give satisfaction, but the essential point to an electrical supply up messages house, especially where from abroad, but they have consider is that they must be as completely a soldering iron or a blow been used in conjunction with torch is not to receiving ap- separated from neighboring objects as pos- be had. The cylinder should be paratus of a highly developed nature, coated quite sible. Several convenient arrangements with shellac before the wire is wound upon different from that commonly used for the are pointed out in the accompanying llus- it and dried reception and one end of the wire is of the broadcasting entertain- trations. fastened to the binding post ments, so let us be reasonable. "A" on one A SIMPLE RECEIVING SET end piece, while the other end of the wire THE ERECTION OF THE AERIAL is fastened directly to the cylinder or the Eventually, various methods for receiv- The aerial, or antenna of a receiving other end piece and NOT to a binding post. sta- ing over short and long distances shall be tion plays a very important part in the re- It is generally found more convenient to described and explained, but for the pres- wind the coil before attaching the end sults we are likely to obtain with a given ent, let us limit our considerations type of receiving set. For to a pieces. this reason, it very simple receiving set. It is to re- is well for those who contemplate taking be After the coil has beer. wound and the membered, in connection with this receiv- end pieces nave been attached, the slider advantage of radio receiving, to give the ing arrangement, that matter more than passing the parts which go rod should be measured drilled and put in consideration. to make it may be employed in conjunc- Unless you are willing to take your prob- place. Where it is not possible to drill tion with some of the more advanced and the brass rod, the arrangement lems to a very responsible dealer and are more satisfactory shown in willing to spend arrangements to be de- the illustration may be used. Two strips eventually a hundred dol- scribed at a later date. lars or more, it is well to forget all about of comparatively thin metal are used to The first consideration and the most dif- clamp the slider rod to the end pieces the bed springs and the fire -escapes and ficult in making by the umbrella frames. this set is what is corn- wood screws passing through both ends of The distance over which a receiving set the metal strips. will function satisfactorily with a given When the position the slider rod is to receiver may be considered to increase as occupy has been decided upon and before the effective height of antenna it has been put in place permanently a sharp the in- knife creases. By "effective height" is meant should be run along both sides of it in the distance above any surrounding ob- order to mark the winding; the cotton jects -not the height above the sea level. or silk covering between these markings If an antenna is suspended between should be removed from the top surface two of 3o -foot poles in the open country it is much the wire by fine sand paper or a fine more effective than file. Emery paper or emery cloth should an antenna of the same not dimensions raised ro 12 be used for this purpose. The reason or feet above the for roof of a 15- or 20 -story apartment house. removing this portion of the insulation However, an antenna of the same is to make some place where the slider will dimen- come sions, hung between two such appartment in contact with the winding of the houses, with comparatively coil, in order to provide a ready means or low buildings including between, may be counted upon to perform If Only a Short Aerial May be Erected, it May any desired number of turns. Consist of Four Wires as Shown Heze. The better than either of the former two types. object of the tuning coil is to provide is a simple means for bringing in desired sig- It obvious, from consideration of these monly called a facts "single slide tuning coil." nals at their greatest intensity and elimi- that the most suitable antenna is one Definite measurements are given in ac- which is as high the nating undesired signals. Every radio as conveniently possible companying illustration, but they do not transmitting and is isolated from everything else. station operates on what is Or- have to be followed very closely. For in- known as dinarily, where it is desired to receive from a "wave- length" and this term stance, where cardboard is mentioned, dry is to be explained later: the object of the the broadcasting stations, with the receiv- wood or some other non -metallic ing sets of the less substance tuning coil is to alter the wave -length of expensive variety, the may be employed; the receiving antenna may be confined in form instead of having the station in order that it may to a diameter of the be of the same single wire, roo to rso feet long and 25 or tube two and one -half character as that of the 3o feet inches, it may be either two, three or even transmitting station ; this operation is called above the ground. Where this tuning. form of antenna is contemplated, three and a half. The same logic applies The method we are now consid- it should ering is the he thoroughly insulated. There t) the number of turns and the size of simplest form of tuning known are many the and it is not forms of antenna insulators on the market, end pieces, though given length entirely satisfactory. Im- the of wire provements, using the same most of which may be relied upon to give should be employed. tuning coil are satisfaction. to be described from time to time, as we With a single wire, the end To make the tuning coil, the following progress. furthest away from the receiving instru- material is necessary: some form of round, In conjunction ments should be attached to an insulator with the tuning coil, it is and non -metallic cylinder (either solid or hol- necessary to employ what is known as a the other side of the insulator at- detector. tached by a wire low) of approximately the dimensions A very simple and inexpensive or rope to the pole or form of detector building which is to support the antenna. shown in the illustration (an empty card- is made by placing a piece of galena or silicon in some Where a building is used for this purpose, board container will suffice) ; two end - form of the position of pieces (wood, hard rubber, holder and having a fine wire arranged so the insulator should be at bakelite or as to touch its least ro feet from the nearest point of some other insulating material), of approx- surface. The construction the of detectors is to be considered building. If a tree is used to support the imately the size indicated or a size which in the next installment of this series, but the type illus- antenna, the insulator should be placed at will be suitable when used with the cylin- a point at trated will suffice until then. Crystal detec- least ro feet outside the branches der decided upon; a piece of square tors of the tree. The same 'brass are not expensive and, where the pro- thing is true of the rod, long enough to extend to the outside spective radioist part of the antenna which is to be carried is not in a position to se- into the house edges of the end -pieces (quarter inch cure the tools necessary for making one. and is generally called the it "lead -in" wire. square rod is most suitable, but other sizes is recommended that he purchase one from some reputable In bringing may be used in a pinch) ; an inch of store. Good ones are the lead -in wire into the to be had room where the instruments square tubing which will just slide over from so cents upwards. are to be In order to hear, mounted, some form of lead -in insulator the square brass rod; a piece of sheet radio signals, either speech, music or code, it is should be used. This is especially true if brass or phorphor bronze about a necessary for quarter the radioist to provide himself with the lead -in wire is not heavily insulated. of an inch wide and an at least inch and a half (Continued on page 898)

www.americanradiohistory.com Radio News for March, 1922 837

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The latest Murdock achievement, the No. 56 Receiver, is a highly sensitive instrument which retains all the rugged strength of previous types. Important features are, the improved comfortable headband, the "Murdock- Moulded" ear pieces shaped to exclude outside noise, and the moulding of all parts into one durable unit.

All models of Murdock receivers are sold with free trial offer and money back guarantee. Use them in direct comparison to any other phones for 14 days. Make any test you wish. Then at the end of the two weeks, if the Mur- dock Phones are not entirely satisfactory, return them and your money will be refunded!

Many of the complete "ready -to- operate" wireless sets now on the market include Murdock Phones as standard equipment. If the set you buy does not, be sure you get a set of Murdock receivers to complete your station. We strongly urge you to go to your dealer and convince yourself of the quality of Murdock receivers, by actual examination, before you buy. Prices $4.50 to $6. Murdock Phones are the standard bearer for a complete line of "Made -by- Murdock" radio parts and instruments. This includes the famous Murdock condensers, couplers and variometers, and the new Murdock Rheostat at $z.00.

Buy Murdock Radio Apparatus From Your Dealer

www.americanradiohistory.com 838 Radio News for March, 1922

,,,,,a,,,,,,,,,,,,,,,,,,,,,,a,,,,,,,,,,,,,,,,, How to Sell Ten Million Radio Outfits (Continued from page 817) RAY- DI -CO.

these "radio bugs" were, and why. The first man I approached, oddly enough, ReducesPrices proved to be an advertising man, who had taken it up because of the promise its fu- Increased production and volume ture held, and who had become so absorbed sales makes possible the most in it that he had, he confessed, "dined into drastic ztT it on its own account until he had almost price cut this year on forgotten what his regular business was." Radio equipment. Ray- Di -Co's He was trying to perfect some sort of an high quality, workmanship and Electncit arrangement which would revolutionize materials are upheld. commercial radio, and was up to his elbows at your finOer ends in drawings which looked to me like a Know the facts in Electricity. They mean moro snarl of fishline, with sinkers dropped in money and better position for you. Hawkins Guides tell you all here ST 4- $64.75 you need to know about Electricity. and there. My next victim was a Every important electrical subject covered so yo-r can understand it. Easy to study and apply. A com- youngster of twelve, whose eyes burned 40 Watt 350 Volts plete, practical working dour =e, in 10 volumes. with the unquenchable fire of the zealot Books are pocket size; flexible covers. Order a set to -day to look over. as he eyed the pieces of apparatus on the counter. His fingers, rough and chapped, ST 15- $97.50 HAWKINS GUIDES fairly twitched to get hold of them, and 3500 PAGES $1 A VOLUME: once he got the ear of the obliging clerk 150 Watt 500 Volt 4700 PICTURES $1 A MONTI-I he fairly exploded with questions until that These hooks tell you all about worthy threw up his hands with a smile Magnetism - Induction- Experiments- Dynamos -- and told boy five ST $138.50 Electric Machinery - Motors -Armatures- Armaturo the to come back after 25- Windings - Installing of Dynamos - Electrical Inetm- o'clock and he'd talk it over. For he was ment Testing -Practical Management of Dynamos and 250 Watt 1000 Volt Motora-- Distribution Systems-Wiring-Wiring Diagrams a bug, too. -Sign Flashers -Storage Batteries -Principles of Alter - nating Currents and Alternators-Alternating Curren: Next came a well- dressed mining engi- Motors -Transformers- Converters- Rectifiers-Alter- neer, slating Current Systems -Circuit Breakers -Measuring who was a slave to the lure of the Instruments- Switch Boards- Wiring -Power Stations radiophone, and who confided to me that Prices in effect -Installing-Telephone-Telegraph -Wireless-Bel Is- Lighting-Railways. Also many Modern Practical Appli- he liad left his partners engaged in a con- cations of Electricity and Ready Reference Index. ference to "hear this new amplifier for March 1st SHIPPED TO YOU FREE himself." A prominent actor told me that Not scent to pay until you see the books. No obligation he "had got Pittsburgh last night with an to buy unless you are satisfied. Send Coupon now -today antenna strung up under his bed in his All motor generators -and get this great help library and see if It is not worth are the $100 to you -pay $1.00 a month for ten months or return it. home in New Rochelle.' It is safe to say four bearing type. The units are that it had given him as much of a pleas- THEO. AUDEL & CO., coupled together by means of 72 Fifth Ave.. N.Y. urable kick as a big hand on his first night, Please submit for examination too. Two middle -aged men, and flexible insulated couplings. Both Hawkins Electrical Guides their (Price Sl each). Ship at once. pre- wives, approached the counter next, and units mounted on cast iron com- paid. the 10 numbers If satisfactory. I agree to send you Si within seven days and for twenty minutes the men talked ani- mon sub -base insuring perfect to further mail you Sl each month until paid. matedly of audions and grid -leaks and OR alignment- armatures carefully Signature step -ups, illustrating with pencil sketches on balanced no vibrations large Occupation the wrappings of their packages until the - Employed by wives adjourned their indignation meeting surface wick oiled bearing. .Ma- Residence and bore them off. "And you talk," said chine designed for continuous Reference one, "cf the job you have to lead LS past Radio Di duty. a millinery window!" There was no comeback. PRACTICAL ELECTRICAL EDUCATION- All Three young men entered, two of their standard Radio Equipment in 6 MONTHS. We teach by scientific and parts and accessories ri.li ii methods the theory and practice of brokers' clerks and the third a bond sales- in stock. Electric -Light Wiring, Testing, Meter Work, man. They interested A. C. and D. C. Armature Winding, Transformer, Motor, were because of the Generator Repair and Maintenance. No matter what jump the radiophone market quotations your education, we guarantee to train you until com- Mail orders receive petent and assist you to secure profitable employment. would give them over competitors, they Hundreds of successful graduates and satisfied employers. said. They all operated their own receiv- prompt attention Write for new ill. Book. Absolutely FREE to the earnest knowledge seeker. ing sets. A prosperous looking lawyer SCHOOL OF PRACTICAL ELECTRICITY sauntered up to counter, - R.N. 352-415 Marshall Street Milwaukee, the adjusted gold WIS. rimmed spectacles and was about to look over a highly polished mahogany box with RAY-DI-CO. Organization Hnost aRan$erbay Me ever built. a great horn labeled "magnavox" rearing Ride44 Styles, colors. sizes; made up over it. I 1547A N. Wells Street in our new factory. SAVE $10 to 825. asked him how and why he Cash or easy payments. Delivered free had become interested. on approval and 30 Days Trial. No Chicago, Ill. charge unless you are satisfied. "Well," he said, with a smile, "you know reseixpt.. °: po,d°Lampsys°-ñé lu, every man is better off if he has a hobby, 41111111111111Mila toryTi prié sand r,srviciTs oofcroünd ter; á: -something totally unrelated to the work Mee'Cycle Company árise which gives him his bread and butter. I aa Dept. 8116 Chicago today started fooling with a little receiving set about four years ago, and today I'd hate to Write For Our FREE BOOKS On tell you what I've spent adding to 't. RADIO There's always something new to this Supplies in stock. game-it's becoming as new and as timely Finished as tomorrow morning's newspaper. More sets. so, in fact, as I catch most of the news Parts for Receiving and given out by the big broad -casting stations Sending. MUNN 84. Co, before the papers Radiotron 631 Woolworth Bldg NEW YORK go to press, even. It's Tubes, UV- Scientific American Bldg....WABHIhOTON. D. C. more than a novelty, however, it's going 200, UV -2o1, UV -2o2, Tower Bldg CHICAGO. ILL. to be one UV-203. Bobart Bldg.. 6112 Mario.; SL. San Francisco. Cal. of the greatest forces for education and entertainment that our day has For Immediate even seen. Listen.- here's Delivery "Follow Events by Radio" what I have heard during the last five evenings, in my Electric Service Engineering Co. RADIO PHONES own room, from seven to eleven p. ni (r) 105 Nest 47th Street New York Bryant 2743 Supplied and Installed A concert by Sousa's Band, (2) Speech by Senator Lodge, in Washington, (3) Spe- Klein's Radio and Electric Shop cial news of the market and 48 Fulton St. NEW YORK stock exchange, every night, (4) The opera ELECTRICITY LEARN T Near 3d Ave. L. l Send for catalog 'Faust," which telle how Bornees Rome Training en - Pitone Beekman 1767 -2999 in Chicago, (5) News and Gov- able. men and boys to get good jobs and keep them. ernment Bareess Electrical School, St weather forecast, (6) Short story Dept. R -3:17 E 424 , Chicago

www.americanradiohistory.com Radio News for March, 1922 839

Ac qßmAVD FOß YNDO!!TG r YNODEA 1 e 1 Chemistry in the Home CHEMICAL t,ßtltlr! a iGES AMERICA SCIENCE rao°o;

www.americanradiohistory.com 840 Radio News for March, 1922

reading by Edna Ferber, (q) Concert by a leading Broadway light opera star, (8) An informing talk on insurance by the president of a large company in Pittsbugh, (g) Crop forecasts, and (to) a cracking good sermon by a nationally known preacher. you have trouble from Time pretty well spent, eh? Like hiring all of these people to come and speak and hand effects with your sing in your own home. Maybe you could regenerative receiver, afford it, but I know I couldn't!" As he ran on, I began to generate a lit- you need talks about tle heat myself to the idea. If a moderate FADA priced wireless telephone could put up into equipment close daily touch with the great world of thought and action in this fashion, why G. A. Shielded Dials FADA crystal detectors are shouldn't nine men out of ten be interested in it ? I asked him. "That's easy," he re- because, by putting a contact on used in thousands of homes plied. "The progress of radio telephony the panel under the highly polished to receive the current events has been so extraordinary during even the nickel- silver dial, and connecting past few weeks that the news of it hasn't the contact to the ground, you and musical programs as gotten around yet. Men not actually in have as perfect shielding as if a broadcasted by radio from touch with its development are, almost metal plate were put behind the without exception, ignorant of its practical panel. The dial does not touch the WJZ and KDKA. workings as applied to them. They think shaft. A beautifully finished, finely of radio in terms of dots and dashes, re- knurled bakelite knob, conical in The simplest receiver con- quiring translation, instead of the actual shape and big enough for a good sists of a tuning coil, FADA words and sounds as heard over the ordi- grip, is provided, making the G. A. nary telephone." He went on to explain STANDARDIZED SHIELDED crystal detector and phones. how you "listened in," with your receiver KNOBS and DIALS the best and With such an inexpensive set. at your ear, to whatever sounds were sent the best looking you can put on out by the transmitter to which your re- your panel. These dials are 3 news from the four corners ceiver was attuned. The addition of an inches in diameter, with 50 or loo of the world and concerts amplifier, such as a phonograph horn, divisions for ie or / inch shafts. by the most noted musicians would reproduce audibly and magnify the spoken message, song, music, or other The Price is become yours for entertain- sound, so that a whole roomful of people could hear it, from a hundred or a thou- ment. And the FADA crys- sand miles away, or even a greater dis- $1.25 tal detector does its task so tance. By this time I wanted to hear some Postage 5c You a of this for myself. It sounded good. He simply. marvel that directed me to a large store where they little of can actu- had a good receiving set hooked up. bit crystal 88-N Park Place magic and "But don't you start unless you've made The General New York City ally capture words up your mind," was his parting shot. "It Apparatus Company Send 1Oc for the new music from the air. gets into your blood, and, believe me, it's G. A. Catalog so all -fired interesting that a perfectly nor You can purchase a FADA mal loving father is apt to find his chil- from your local dren's shoe money irresistibly swept into detector tubes and condensers !" electrical or radio store for I "listened in" and it proved a revela- BANGERT ELECTRIC CO., tion. Once the head -phones were adjusted INC. I might have been completely off of this 297 Fulton St., Jamaica, N. Y. whirling sphere, for all of the mental con- Branches: Hempstead Freeport $2.25 nection I had with it. It was as though you were sitting up on top of the globe, SPECIALS in a world made up solely of sound. First %" Mesco Spark Coils $3.00 a few clicks, then a steady humming, like Variometers 1.5o a distant hive of enormous bees, then, with Tested Mounted Crystal .30 startling and sudden distinctness, a man's Phone or Grid Condenses ,20 voice saying, "Baltimore, Maryland," in my Grid Leak and Condenser .25 ear. I jumped, and the operator threw Insulators .25 back his . head and laughed. "He won't loo Amp. 600 Volt S.P. -D.' , hurt you," he assured me, "he's a long Switch 3,7o way off." We revolved one of the black rubber knobs on the face of the box, and Agents for the strains of Schubert's "Song of Love," Radiotrons and A. P. Tubes exquisitely played by some fairy violinist GREBE in this invisible world, flowed in to us as CR-5 - CR -8 - CR -g - RORK sweetly and distinctly as ever I heard it in In Stock an auditorium with the virtuoso standing Westinghouse Murdock before the footlights. This was followed - - Fada by an Radio Corp - Paragon - DeForest outline of the minute's news (almost Magnet Wire Copper before it happened !, and a couple of fox- - - trots by some etheral jazz band. The operator plucked my sleeve, and removed my `headpiece. `We staged a wireless BUILD YOUR OWN dance upstate last summer," he laughed, WIRELESS RECEIVING SET "with the orchestra down here in the city. - You can Went over great, too. The only trouble SAVE DEALERS: Ask for trade in- was that the players couldn't hear our ap- at least formation on FADA products. plause, and after one encore had been $25.00 You will find them profitable, played a negro voice would announce, By buying and fast turning stock. Dat'll be all fo' dis one, folks!' " parts and It was late that night before I reached assembling home, but I had learned a lot. It had all yourself F. A. D. ANDREA the fascination of listening in on the mys- Think of the pleasure and practical experience terious conversation of two men in the you will gain in making your own set, with wave- Manufacturer Radio length range from 170 to 2,500 meters. of FAOA train seat just ahead of you, with infinitely We furnish full -sized blueprint and complete de- more profit tailed instructions for making this set and prices Products -and no chance of getting your of parts for $1.00. nose punched. It gave me that warm f eel- Write today and net .started 1882-A Jerome Ave. No Y. C. ing, so gratifying to every small human K. & G. WIRELESS SUPPLY CO. Dept. ISA, 152 Chambers soul, of "hearing something first," and be- Street, New York City

www.americanradiohistory.com Radio News for March, 1922 841 Get This All- Rubber Willard Radio Battery

All the features This battery )f the automobile which has been de- ;tarting and lighting veloped especially Jattery applicable to meet the require- :o radio work have ments of radio work, peen retained. is made in a range of sizes to fill all needs.

You can't have the quiet cperation o_ withstand that voltage before leav- yc ur set you are entitled to unless your ing the factory. battery is proof against leaks both from The Threaded Rubber Insulation cell to cell and from cells to ground. between the plates is the same as The Willard All -Rubber Radio that in the Willard Threaded Rubber Battery is made so that there is no Battery; now in such wide use on possible opportunity for leakage. The motor cars, and for which the build- case is a single solid piece of rubber ers of 191 makes of cars and trucks formed under heavy pressure. I t is pay an additaonal price. tested with wireless transformers at Ask the nearest Willard Battery 2 '-,000 volts, and every ease has to Station for details, or write us direct. Willard Storage Battery Company, Cleveland, Ohio Made in Canada by the Willard Storage Battery Company of Canada, Limited, Toronto, Ontario THREADED RUBBER BATTERY

www.americanradiohistory.com 842 Radio News for March, 1922

ing able to yawn comfortably in my friend's face when he rushed up next morning with the paper, and to say, "Oh, yes, I got that last night, while it was going on, or just afterward." And it lent a Radio pleasant satisfaction as "being in on" a great and most remarkable invention, still in its childhood, but destined to rival the Operators! telephone at a not far distant date. So much for its appeal to the constantly Let us help you get the most out increasing number of radio enthusiasts - "The they have arrived. What we are con- of the radio equipment that you Watch cerned with is the placing of it before the have, or may wish to purchase. Dog John Smiths and the Bill Browns in such a personal and interesting manner that Our experience together with of the they'll begin, one by one, to think, "Now, our complete stocks places us in Tube" that's something that I'd like to get in on. That's too good to pass up. Wonder how a position to be of special serv- much it is, anyway." While the gospel is ice. We are distributors for being faithfully and earnestly preached by representative manufactur- the present converts, the story of radio's such attractions cannot depend, obviously, on ers as this good but slow method of advertising for the immediate and universal boom Radio Corporation which it deserves. The present advertising is practically confined to technical radio Remler Coto Coil publications and dry as dust to John Smith Murdock Chelsea and Bill Brown. They don't understand 2` 8 it; the cuts are of apparatus and the text Clapp Eastham De Forest bare outlines sketching its selling points. Baldwin Jewel They might, and undoubtedly do, sell the

www.americanradiohistory.com Radio News for M arch, 1922 843

aneis Three distinct and exclusive types CHOOSE t:-le panel best suited to your needs and made to your own individual specifications. Any size or shape you desire - any quantities, one to a thousand-engraved or plain -polished or dull mat surface -plain blank or fully machined and ready for mounting. Diamond F Radio Panel Service gives you the choice of three distinct types of panels, each a leader in its field. CCONDENSITE ELORO ELORO ELOROl ! FIBRE-VENEER CSHIELDED PLATES (paten: applied for) is made (patent applied for) are made Grade 10 is the higiest type concealed copper wire radio insulation made. Ex- of a hard fibre core veneered with a on both sides with Condensite mesh imbedded directly under tremely high in surface and of the plate. resistivity, high in di- Celoron Grade 10. It meets the back surface volume the demand for quality plus This wire shield, when proper- elerric strength and low in very effectively losses. It is hand- lcw cost. We recommend it for ly grounfied, dielectric in receiving sets and other neutralizes all detuning effect some in appearance, extremely use body ca- machines easi- apparatus where very high and "howl" caused by wa'er resistant, radio frequencies pacities. Made in both Grade ly, and will give long lasting, voltages at Fibre Veneer. satisfactory service. are not involved It has the 10 and Celoron some fine surface as grade 10 and similar machining and engraving qualities. Send for our Radio Panel Guide Write today for ou: special "Radio Panel Guide," giving complete details regarding all Celoron Radio Panels. This guide quotes prices and enables you to determine just how r-luch any type of Celoron panel will cost in either standard or special size-plain or fully machined, and engraved to your own specifications. Don't fail to get your copy of this important Guide by return mail. Write us immediately. Dealers : Our Radio Panel Service enables you to sell panels completely machined and finished to the buyer's specifications. Write for our Special Dealers Proposition. DIAMOND STATE FIBRE COMPANY BRIDGEPORT (near Philadelphia) PENNA. Branch Factory and Warehouse, Chicago Offices in Principal Cities In Canada: Diamond State Fibre Co. of Canada, Ltd., Toronto

www.americanradiohistory.com 811 Radio News for March, 1922

simple, both in phraseology and illustration, and would show him, not what the inside of the apparatus looks like, but what 2 it will do for HIM. In this connection, I feel sure that if the manufacturer could you want your cover up more of the knobs and dials and switch posts, and work along the line of simpli- knobs to match your fying the present ominous exterior, it dial knobs, use would go far to break down sales resist- I ance. Knowing nothing of the technical end of the business, this may be impractical, but it would most certainly be of far - O. A. LOCKED reaching effect in the favorable approach of John Smith. LEVER SWITCHES How shall we reach him? Obviously, we cannot leave the entire burden on the They are of the same design as radio magazines. He must come across the G. A. SHIELDED DIAL our story in the magazines and newspapers KNOBS, but smaller, with the which are a definite part of his daily life. switch lever protruding from the Radio could show John Smith that it could foot of the knurled part of the do something for him. It could induce knob. Thus the lever can never the mood to "Well, let's just look at her, come loose from the knob. A anyway," when you or your dealer made smooth shaft, 136 inch in diameter, that possible. carries a collar and set screw, What form would it take? Would it with a large contact surface Iug not be well to inquire into the methods to assure perfect connection. The which shrewd advertisers of phonographs switch arm gives a i inch radius, have employed to sell more than 4,000,000 permitting the use of 20 switch in the last three years? Ioints '; inch in diameter. When You Couldn't Buy Does he show his machinery, cross -sec- you buy G. A. switches you can tions of his get G. A. nickeled switch points, cabinet, and hope to halt the with skipping progress of the man thumbs their special, small -size nuts, who at 4c each, points This Knowledge through the advertising pages a and stopping at by fetch- Sc each. ing cut of his scratch -proof sound -box? For the switch AT each of the SORSINC offices Not on your life. He shows 'em pictures The Price is ;there are thoroughly trained of favorite opera stars in their magnificent professional radio men who costumes, singing. He brings black -face 65c know from experience the past per- Al Jolson, Ted Lewis and his jazz band, formance of each piece of apparatus. John McCormack, John Philip Sousa, and Postage 4c the vaudeville head -liners right into life 88'N Park Place Backed by the most complete stocks before you on the page, and sells you, not The General of the leading lines, these men can phonographs, but music. And we will be New York . City advise and help you in investing your able to do that, and go them one better, },, Send 10c for the new Apparatus CompanyY J G. A. Catalog money in radio equipment to your for we can bring them their music in their AP best advantage. It is well worth your homes without the expense which the pur- while to take advantage of this ser- chase of records entails. And news, red - vice, and -it costs no more to buy hot! Rotors and Stator Sections Would we not be able to from offer every va- FOR VARIOMETERS AND VARIO COUPLERS riety of musical entertainment, with the cooperation of the manufacturers, and schedule definite programs in advance? Much has already been done along this INC line. Could incidents of real human interest which radio has brought out -not spec- "%. tacular "stunt" advertising -fail to interest _ 11Vlilbiil!I We have just prepared an interesting John Smtih? Actual daily happenings em- little booklet illustrating the best ap- phasizing the simplicity and the thrill of paratus on the market today. Fill in it, the comparatively small expense and the coupon and enclose 6 cents in stamps "whole family" appeal which this marvel- to pay postage on your copy. ous little box can make a reality for him? There is apparently no limit to the future of radio. And by future I do not mean years and I-1IP OWNR years from now, but the immediate future. RADIO SERVICE INC.,/ With such tremendous strides as it has Our Rotors and Stator Sections are made from see- J made in the past year alone, may we not . daily selected and treated wood 'Mahogany, Valetta, 80,WashingtonlSt. ;_New York,`N. Y look etc. They are carefully made and accurate -"Not with something more than reasonable wood turnings" but Pattern makers precision. assurance for some of the following de- Rotors Packeu 50 and 100 in standard packages Branch Offices and Dealers Everywhere Stator Section Packed 100 and 200 in standard velopments ? packages A write for Circular "The Largest Radio Chain Store wireless telephony service in railroad DEALERS Write for Proposition stations, large and small, to help pass the System in the World" tedious waits between trains. Could not Norris Electric Specialties Co., Inc. the amplifier, which is even now used to 126 LIBERTY STREET NEW YORK Interesting announce arrivals and departures of trains, DEALERS -propos tr be utilized with radio to produce music, news NMI ...... 11 ..r.. =1^ and entertainment for the waiting SORSINC, 80 Washington St., New York throngs in the station "Radio Room "? On shipboard. Herewith 6 cents in stamps to pay mailing with the radio sufficiently GUARANTEED RADIO BATTERIES expense on my copy of your latest booklet. amplified, could not the passengers' con- Our new sales plan, selling direct from fac- nection with the outside tory, now enables you to buy famous Bell world be made Radio Storage Batteries less the dealers' and more real and alive than by means of the jobbers' commission- saving half! Guaranteed occasional bulletins now issued? in writing for l',5 years. Bank References. 6 Volt 40 ampere..$12.00 How about adapting the radiophone to 6 Volt 60 ampere.. 15.00 make profitable use of the hundreds of 6 Volt 80 ampere.. 19.50 Bell Batteries are also built for every make hours we annually waste on subway and and type of automobile and on our new plan "L" platforms? of selling from factory to consumer you save 50%. Send $5.00 and any battery will Today's pace in living a be expressed, balance U.O.D. exacts higher subject to your approval. Cata- .'v toll on the energy and nerve fofce of the log of auto batteries free. individual than never before -we MUST INDEPENDENT BATTERY RN-8-2 keep abreast of the times, or a little ahead, CO., 1988 Grand River Ave. and every mechanical help which works Detroit, Mich. SOt

www.americanradiohistory.com Radio News for March, 1922 845 DREYFUSS PHONES CONCERT TYPE NOW READY FOR DELIVERY Distributors Dealers Be sure to visit BOOTHS 26 & 27 at the Radio Convention (March

7 to 1 1) at Pennsylvania Hotel and see the DREYFUSS PHONES ON DISPLAY These are 2000 ohms, have aluminum backs and rubber caps, and are considered the best phones for Radio tele- DELIVERIES phony work. 15 to 30 DAYS Designed by Telephony Engi- neers of over 18 years experi-

No Orders Ac- ence. cepted that cannot be filled within time limit specified. $8.00 per pair, list price

Distributors will find it to their advantage to see us early for open territories. P. M. DREYFUSS CO., INC. 150 CHAMBERS STREET NEW YORK CITY Branches: 179 Greenwich St., N. Y. C. - 29 Cedar St., Newark, N. J.

www.americanradiohistory.com 846 Radio News for March, 1922

for conservation of our resources is not only welcome, but necessary. Chicago is equipping its policemen with Insist upon getting receiving apparatus, the aerials woven into the coat fabric, the "box" so small and so 713E. simple that it / AV BEACH can be carried in the pocket . [4 7168 and operated with one hand. Does this not suggest possibilities for similar practical use by ether municipal bodies than the Police Department? In our State Capitols, as in Washington, matters of the utmost concern to every In response to a pro - citizen are being proposed and debated. N Officials. from the nounced demand A A President and State growing (ARLINGTON - TESTED) Governors down, are making speeches out of our which we ought to hear. Is this not Op- success in teaching portunity? commercial R a d i o, Hundreds of thousands of business peo- we now offer DETECTOR ple commute to and from their work in our large cities every working day. The motion of the train and the often unsatis- Special factory lighting go far to produce the eye- MINERALS strain which our habit of `read- while-you- CORRESPONDENCE ride" has rendered national. If the radio telephone were installed in these cars, and COURSE in CITIZEN RADIO the day's news given out briefly, crisply and distinctly, would not such an innova- giving complete and accurate tion pay a manufacturer, as well as con- instruction in plain non- tribute mightily to our national health? technical way about "hook- In these days of congestion and over- ups," "tuning," maintenance, crowding of our public schools, with as and the hundred other great a dearth of teachers as of seating - things space, is there not a golden opportunity about which amateurs need for the broadcast instruction and dissem- to know. ination of knowledge by radiophone? We think there is, if there be men of sufficient Detailed information on request vision to see it, and the courage to make for crystal detectors the most of it. MASSACHUSETTS RADIO and All of these particular projects may not It isn't just galena, silicon or be feasible, just as there are, doubtless, TELEGRAPH SCHOOL, Inc. other mineral that you want dozens of others which are useful and 18 Boylston St. Boston, Mass. when you buy detector crystals. workable. fact remains that radio But the Formerly Boston Schools)! Telegraphy. Established n01 You want super- sensitiveness! has already demonstrated its right to a You can be assured of loud sig- front seat in the theatre of our life, and nals and clear speech when you it proves this right almost by the hour, use NAA (Arlington Tested) with its continual revelation of new pow- crystals in your radio detector. ers for good. Its merit is established -all READ THIS DOPE that remains is to popularize it as it de- Wesco Antenna Wire 250 ft. 500 ft. 1000 ft. NAA Crystals are the original serves. The greatest force in the world 7 -22 Stranded Copper $2.00 $3.95 $7.50 No. 14 Solid Copper 1.25 2.40 4.30 tested minerals. Each piece is is need for this ; intelligent, far -sighted Wesco Magnet Wire-'/ lb. Spools carefully tested an adequately advertising. B and S. Ga. Ena.m. S.C.C. S.S.C. wrapped and packed in con - 20 to 24 $.55 $.65 $.90 26 to 30 .65 .95 1.30 venient containers. For sale by e11...1...M.111,1.11M1111111111..1M.1.11111.111111..1.11111.1M111M.M.111111111111.1...1.1.1.1.,: 32 to 36 .80 1.40 2.15 good radio dealers everywhere No. 23 Single Silk Covered, 90e per 1/2 lb. spool. or mailed, postage paid on re- An Efficient Remote Genuine Bakelite Panels-3$ inch thick ceipt of price. 6 in. x 101 in. ...$1.30 s in. x 10 in $1.50 Control System 6 in. x 14 in.... 1..50 12 in. x 14 in 3.25 6 in. x 21 in.... 2.25 12 in. x 21 in 4.75 PRICE LIST (Continued from page 819) For 3/16 in. thickness add 50% to above prices. i111111. 111111111111. 1111. 1111ií 111111111 .1.11111111111111111111111.11. 11111111.1111. 111111111111 .111111í1.111.M1111111111 a Unmounted Mounted* Wilmington Electrical Specialty Co. $0.40 NAA GALENA ...... $0.25 This safety feature may be used in vari- 912 Orange St. Dept. G -7 Wilmington, Del. NAA GOLDITE .....$0.25 $0.40 ous ways. For example, if the relay key 1 NAA SILICON $0.25 $0.40 should stick, which it never has in our case, holding down Key A, Fig. 1, will USE THIS STRAIGHT HORN *Mounted Crystals are set in Wood's shut off the entire set, thus preventing a to eliminate distortion and Metal in brass cups s/s inch diameter. Each receiving a neat trip from the station to the obtain maximum output crystal is furnished in polished if from weak signals. It is ebonized box. transmitter. Also any of the control 20" high and is made of line wires should become shorted through special fibre composi- Unmounted crystals are individually magnet E tion. It stands upright packed in our instantly recognized litho- accident, the would operate, on a telephone when the graphed containers. allowing the weight P to descend and STRAMCY COUPLER again shut off the entire set. is nsod THE' STRAM- These reputable jobbers CY COUPLERS enable you to DEALERS Fig. 4 illustrates the magnetic relay fasten the HORNS TO YOUR can supply NAA Mineracs key used. A regular Boston hand key TRLEPHONE$1. They fit over the caps of the telephones. J. H. Bunnell Co New York was used in constructing this, and an They also fit the tone arms of the Victor or York armature was mounted directly below Columbia phonograph. HORN 75c COUP - Manhattan Elec. Sup. Co New LER, 50c. Stanley St -Patterson Co New York the knob. The magnets were made by P. M. Dreyfuss Co. New York cutting a common telephone induction MAILED POSTPAID ON RECEIPT OF PRICE F. D. Pitts Co. Boston coil in two parts, removing the wind- Doubleday -Hill Co ...... Pittsburgh ings and rewinding them full with No. STRAMCY PRODUCTS Robbins Elec. Co. Pittsburgh 24 enamel wire. The_ core is /" in P. O. Box 435 NEWARK, N. J. Pittsburgh Radio & App. Co., Pittsburgh diameter and both magnets are 2" long, Radio Elec. Co. Pittsburgh and 1%" in diameter when completed. $15 Leo. J. Meyberg Co. San Francisco This key has given excellent results, han- Remler Radio Co San Francisco dling easily 3o words a minute, and has Radio Receiving Sets Herbert H. Frost Co San Francisco never given any trouble from sticking To listen in on musical concerts, speeches, due to use of a strong spring tension. and sayings, buy a Both the escapement switch magnets NACO RADIO OUTFIT and the relay key magnets are operated There are many different sets on the mar- on 110 volts direct current. R°, Fig. e ket, but for quality, efficiency, clearness and e*al\EAumaim.totIhtc simplicity a NACO Receiving Set predomi- allows about five amperes to flow nates. Radio Department through the magnets E, giving them an $15 Newman -Stern Building CLEVELAND abundance of power and a snappy action. R°, Fig. I is two Too watt lamps connect- NATIONAL MOTOR ACCESSORIES CORP. ed in parallel. Where direct current is Woolworth Budding New York City

www.americanradiohistory.com Radio News for March, 1922 S47

RADISCO " RECOMMENDED" -

A Specials for sale now. ` ' ,

A welcome sign -for both dealers and I amateurs -is this announcement of ;. _-- "Radisco Recommended" apparatus for immediate delivery. The items listed on this page include the apparatus to assemble a high grade short RADI3C0 COUPLER RADISCO VARIOMETER wave tuner. Get this and other "Ra- without dial with dial disco Recommended" specials NOW at any Radisco agency.

RADISCO COUPLERS (reduced price) $7.00 G+# (with 3 in. Corwin Dial and Knob) 8.00 RADISCO VARIOMETERS, for plate or grid 7.00 (with 3 in, Corwin Dial and Knob) 8.00 ` FAMOUS NO. 3 SWITCH (Illustrated) .90 -- _.,.... No, 2A Switch (not illustrated), 1' in. Knob, heavily nickel plated .65 No, 2 Switch, same as above except all brass finish .55 Is sMXo.mtireau i BP -2 Binding Posts with composition . each .12 nut, gas PADISCO p á BP -3 Similar. to Standard Navy Binding Post, each ,12 101's APPARATUS . i CP -1 Contact Points with machine screw, .20 BETTER "BB° BATTERY per doz. ..T R CP -4 Contact Points with nut (brass), RADIO DISTRIBUTING CO. per doz. .35 NEWARK. N. J. CP -5 Contact Points with nut (nickel r plated). per doz .40 SS-18 Switch Stops, each .05 No. a SWITCH RADISCO BETTER "B" RADISCO BETTER "B" BATTERIES LEVER BATTERY No batteries at the price are as good. No batteries at any price are better. Small size 1.50 -( Milt t. Large size (with 7 taps) 2.65 ill ; I; All sizes of Radisco Coils, mounted and Lit - unmounted can be supplied at once at standard prices. -

The nearest Radisco agency can sup- C t ply you immediately with the appara- !! tus listed on this page, and you can count on him to have more apparatus of anyone else, too! If CONTACT BINDING in advance c ' No. 3 there is no Radisco Agency near you, POINTS No. i POST ask theleading Radisco dealer in your BINDING section for these "Radisco Recom- POST No 2 mended" specials. Don't accept any excuse of non -delivery. He can get them for you -from Radisco.

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www.americanradiohistory.com 848 Radio News for March, 1922

THÉ "DE LUXE" BROADCASTING RECEIVER Compact Durable Ultra- Efficient

Atlantic Radio Service extends . not only to experienced amateurs but also to the "radio novice" -the person who is just becoming interested in wireless telephone broadcasting. We have recently opened a second branch store at 115 Bridge Street, Spring- field, Mass., under the management of Mr. A. S. MacLean, well known in A. R. R. L. activities. Our salesmen are all experienced wireless operators who understand the stock they are selling and are anxious to help you get the best results. Tell them of your problems -they will help you. If you cannot visit our stores remember our mail order department.

When your friends newly interested in Radio Broadcasting ask you for advice fell them about Atlantic Service and advise their procuring our three new bulletins-"The H. R. Regerìeratdve Tuner', "Broadcasting Receiver DeLuxe", and "Radio Broadcasting". Or we will send them to you, direct, upon request. "Bulletin 14" -the best radio catalogue published-is now out print. Watch this magazine for notices of our new bulletin.

THE DE LUXE BROADCASTING RECEIVER -a modern radio receiving outfit in one complete unit. This equipment has a range of 1,000 miles and over, will re- ATLANTIC ceive spark, continuous wave and radiophone signals, and through the use of a 1oid speaking MAGNAVOX will provide entertainment to a large assembly. For general broadcasting r°eceptien this receiver is unex- RADIO CO.ic. celled. BRANCH Supplied complete in every detail, special table wired for instruments. "A" Battery. `B" Batteries, Vacuum 727BoylstonSt. 15 Temple St. Tubes,.- Antenna Outfit, etc., etc., and complete instructions for operatic n. Boston, Mass. Portland,Maine Send for our free bulletin describing the De Luxe outfit in detail. A. R. CO.

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www.americanradiohistory.com 849 Radio News for March, 1922 not available to the amateur for operation of the control, we believe that alternating current, rectified through electrolytic jars will give the same excellent results and be just as efficient. It will perhaps occur to the mind of the reader that a positive escapement arrangement on the main switch would be better that the escapement arrangement we have provided. This occurred to our LEARN TELEGRAPHY minds, but was discarded because of the (Wireless or Morse) larger factor of safety obtainable with the escapement finally decided on, in that an accident happening to the line will automatically shut the set off under the AT HOME present arrangement. Key B at the con- In Half the Usual Time trol station may be the ordinary telegraph key or a bug, as there is no arch- You ing at this point while operating the Let the OMNIGRAPH Teach Wireless transmitter. Key A, which handles a "Just Listen -The Omnigraph will do the teaching" The Omnigraph is an Automatic heavier current should be built with car- Transmitter that teaches you both and should have a larger bon contacts, A 4 the Wireless and Morse Codes, gap adjustment than Key B. Light M at home, without any expense should be io watts or even less if avail- as an indicator except the cost of the machine able, and is merely used Merely to to show position of the rotor on escape- itself. connect battery ment switch. The wire used in running and your Buzzer, or Buzzer and the control line was 14 gauge galvanized Head Phones, or to your Sounder iron, and this was fastened to poles and and the Omnigraph will send un- trees by small porcelain insulators, mak- limited messages by the hour, at ing a very economical installation. The any speed you desire. on entire control apparatus was mounted USED BY THE U. S. GOVERNMENT a panel, which was placed in the trans- fc the mitting station, and greatly helped Write for Free Catalogue of this apparatus. appearance For a few dollars you can have a complete outfit that will make you an experienced operator in the The control described in this article shortest possible time. No hard, laborious work-just learn by listening. The Omnigraph is adjustable been built, and during the so you can start receiving messages slowly, gradually increasing the speed as you become proficient. has actually You'll be surprised hew quickly you will attain speed. 5 ven if you are already an operator the four months it has been in operation, has Omnigraph will help you. It will make you more promdent, mere accurate and more confident. Thousands given the greatest satisfaction. We will of Omnigraphs are in use today and thousands of operators owe their success to them. be glad to answer any letters concerning the construction of this set, and will help ,, 20 Hudson St., New York City any amateurs desiring to construct such The Omnigraph Mfg. Co We also manufacture the OMNIGRAPH RADIO RECEIVING SET. A complete Vacuum Tube Set Including a control. Tube, a pair of 2,000 ohm Phones, A and B batteries, Aerial Wire, Safety Switch, Insulators and Ground Clamp. All enclosed lin a carrying case, handsome enough to install in your parler or sitting room. Price $48.00. Nothing to approach it at anything near the price. No previous knowledge of wireless required. Set comes to you completely wired. Nothing additional to purchase. lust erect your Aerial, place the to ears and listen -in. Absolutely guaranteed. Note on Oscillations of a Phones your two element valve (Coi;tiiliied fiotn page 815) _

the sum of the e.m.f.'s in circuits I and II, we have Circuit I- di =o=Rp (i ii) +L --} -Ri (I) dt Circuit II- dt C e= o= Ri+L - -- f, dt (2) I di A perfect realer at last, fully automatic and Solving for i, in equation (I) and sub- foolproof in eiew respect. It can be operated by stituting its value in equation (2) we get any o ne. d'i R r di i The + ( + -- -+ ---- dt' \L CRp dt LC HOMCHARGER R + o (I - = Connects to any alternating current lamp socket, gives a taper charge -will fully Rl charge any "A" battery over night. It is self -polarizing. Connect your battery either way and it will always charge. Automatically disconnects battery when power is inter- The condition for oscillations is that the rupted. Restarts charging when connections are restored. Adjustable for wave form, frequency and voltage.. Contains only one moving and two wearing parts, lasting thousands of hours, di replacable as a unit for $1.00. coefficient of - be equal to zero. Setting The highest charging rate, greatest efficiency, and simplest of any rectifier selling for less than dt $100.00. Bulletin 028 proves it. Ask for your copy. Manufactured in sizes for charging three or six cell batteries from both alternating and direct R 1 current circuïts. Cannot injure battery-will last a lifetime-approved by underwriters- satis- equal to zero and solving for Rr faction guaranteed. For sale by all Radio, electrical and accessory dealers or shipped express -+ - prepaid for purchase price -- $10'.50 L CRp we get L Send for special bulletin 58 showing how easy it is to "UOMCIARG1t" your Rp = -- battery. CR That is, the resistance of the two element valve must be negative in order that oscillations be generated. In other words, the THE AUTOMATIC ELECTRICAL characteristic must be a falling one, and DEVICES CO. since no well evacuated tube gives a falling 118 West Third St. CINCINNATI, OHIO characteristic, it will not oscillate. A tube Canadian Distributors -Rowley & Moody, Ltd., with gas does give a falling characteristic Toronto over a certain range of voltages and it will oscillate in this range of the curve.

www.americanradiohistory.com 850 Radio News for March, 1922

'TEL/. Radio Transmitters SAY 5qBACK 64 Amateurs Have 155 Overlooked Its (Continued front page 807) rarera 899 BOTISTON ST. ductance which when substituted in the BOSTON, MASS. common decrement formula would yield a legal decrement. This apparently is not so, however. No technical explanation of the phenomenon Í?as been :advanced by the engineers of the °Independent- Wireless Tele- spARK.,:ARC_ITAcuum TUBE graph Company or by others. To study the actual oscillations that take place in the ra- The Revised EramlEt -one for Commercial Operator=_ including ARC and VACUUM TUBE is carefully and fully covered by 113 Course of Instruction effe_e I by the EASTERN RADIO INSTITUTE. Intelli- diating circuit of this type of transmitter gent stunts INSIST on being taught upon ACT JAL a.aparat.L3! requires the use of an oscillograph which is a rather delicate instrument not always available.

c -re A diagram of the Shoemaker "B -I" transmitting circuit is shown in Fig. 5. As will be seen, the circuit is extremely simple and the connection of the apparatus requires no .1' The wave -length ¿ ' explanation. can be read- 1 3 , , ily changed by altering the value of induc- ' tance at the single coil in the circuit. With the large antennae used in commercial practice it is necessary to insert a short -wave condenser in the radiating circuit when it is Aakb desired to transmit a 300 -meter wave -length. Offhand, it may be that the relation of the stationary electrodes to the periphery of the revolving disc of the gap acts as an s " effective capacitance immediately after each _ ' - spark discharge. This capacitance then takes the place of a small condenser in series with the antenna and ground and permits the circuit to oscillate freely until the ' 1 j ' next spark discharge occurs. This view, however, is attended with some difficulties though it is partly strengthened by the tact k rF7 that the system operates best when the dis- #y.._v. tance between the stationary and moving electrodes is great. This is in contradis- tinction to the adjustment necessary in other k: types of transmitters employing synchronous rotary gaps and tends to indicate that the ''he EASTERN RADIO INS- ITITE'î 2 K.W. 'ARC' spark must be of extremely short duration. The EAST RN I'.A?IC INSTITUTE is the OLDEST_ T..RGESS and BEIST EQUIPPED Radio School That is, the quenching must be rapid enough in New England. Tit ? oneer school that has alces led the way I Ask any man in Radio-io will tell yowl to permit the system to oscillate freely and New S- ndeats can -argil to advantage in the Day or evening ehool on any Monday. with as little conversion of the energy into REMEMBER. -Ou )R3ANIZATION with YEARS of PFIEMOMENAL EXPERIENCE and SUCCESS Is heat and light as possible. There is an- behind every man wk. =Iroffs. Ask any man in Bailie he w I tell you! OVER 4000 satisfied graduates TELL OUR STORY BEST! Why not be one? other and more technical explanation of the Our illistrated ',rests:0.m is free. If you cannot visit the Irstitute send for one. possible operation of this transmitter, in which the potential and current distribution F. D. PITTS, Director of the antenna systems are taken into account. It is not to be discussed at this time because of space limitation, but may form the subject of some future article. Fig. 6 shows the commercial construction of the Shoemaker "B -I" transmitter. All low voltage accessories are mounted on the front of the panel, whereas the high fre- Wire Your Own quency apparatus is mounted at the back of lower right hand side the The Standard Assembling Co. does the panel. At the all the panel drilling, mounting, rotary gap and synchronizing control are etc., which Is essentially machine plainly visible. The rotor or the gap may work, and leaves the wiring (hand be mounted directly on the shaft of the work) for you to do yourself. Only in this way can you get the ap- motor-generator, as shown, or it may be pearance and results of properly driven by a small synchronous motor. assembled apparatus at a price but ex- little over the cost of the parts. Although other types of transmitters ist which have served the commercial inter - In the case of the multiple wave estes well and which should rightfully be tuner shown here, this plan saves given you a clear $5.00. This instrument included under the heading this receives all classes of signals on article, enough has been said to drive home all known wave -lengths: ' 150 to the fact that there is a field for experimen- 25,000 meters. Sent anywhere in tation which the radio amateur has entirely the U. S. on receipt of one-third the purchase price. If satisfactory, ignored. Many will now look forward to remit balance, if not, return (in- the publication of empirical data that may strument for refund. be gathered by progressive amateurs work- line of thought, and it is FOB NEW YORK ing along this PRICE hoped it will not be long forthcoming. A WIRED $50.00 200 - METER IMPACT - EXCITATION C UNWIRED $45.00 TRANSMITTER -who will be the first to Or. PLUS IN STANDARD ASSEMBLING CO. 19 Bridge St., New York develop it? SIMPLICITY Secad stamp for details. TRANSMITTERS by Sign on the dotted line.

www.americanradiohistory.com Radio News for March, 1922 851

; " i;dl''tl /' X'y/%4-

Ìip.!p'4

reproducer This trade mark (Registered) on wífh fhe apparatus signiflís such apparatus is made by the MAGNAVOX movable cog world pioneers in the manufacture of sound amplifying de- v ::ces. It appears on every piece of MAGNAVOX equipment. None genuine without i;. For your protection see that it is there.

il ul srated,mwith114 hoTYPe G11,VoX makes á45 radio enjojable For all

There is no substitute for the MAGNAVOX, the reproducer with the movable coil. It is the original loudspeaker, now the world's standard loudspeaker. With the MAGNAVOX NEW Radio MAGNAVOX it is easy to reproduce radio music for indoor or outdoor POWER AMPLIFIER entertainment, for concerts, and even for dances.

Properly energized, the Radio MAGNAVOX will accomplish what no other radio repro - ducing apparatus ever has accomplished -great sound intensity without distortion. It's the famous movable coil that does it, and no other apparatus has this coil because it is patented by the Magnavox Co. That is why there is no substitute for the Radio MAG- NAVOX, and no set is complete without one. The hookup is simple, and no extras or adjustments required. Type R -3 uses only i ampere in the field. Type R -2 but % ampere. You don't operate the MAGNAVOX, you simply listen and enjoy. The few simple instructions necessary, free with each outfit. And to make your set fully complete, you will also want one of the new MAGNAVOX two or three -stage Power Amplifiers. Ask your dealer, he will advise and assist you. The New MAGNAVOX Power Amplifier is designed for use REMEMBER you and your friends, the MAGNAVOX provides a source of with transmitter tubes and high -for plate voltages to furnish ampli- satisfaction and scope of enjoyment obtainable from absolutely no other equipment fying power for the Radio in way. See MAGNAVOX where great sound or no other your Dealer today. intensity and large volume are required. It also minimizes the possibility of distortion. Solid GO mahogany case, sits either flat THE MAGNAVOX CO., F CCES OAKLAND, CALIFORNIA or on edge. Simply throw the switches to operate. Two -stage 370 7th Avenue, PENN. TERMINAL BUILDING and three-stage types. Ask your NEW YORK OFFICE, dealer for prices and particulars. In writing, please address the MAGNAVOX office nearest you.

There is NO substitute for the Radio MAGNAVOX

www.americanradiohistory.com 852 Radio News for March, 1922

The Development of the Transmitter RADIO FREQUENCY AMMETERS (Continued frogia page 816) 1.1111111111 .111111111111111111111,,, 11111111111111111111111 11111111111111111111111 11111111111111111 ,1,1,,,1,1:

mate trouble from "packing and permit the use of a much higher modulation voltage than would otherwise be necessary. It is even possible that the modulation transformer might be done away with. The writer has experimented with the condenser - microphone and has found that it has vastly g.., more superior modulation qualities than any existing form of microphone. There is no carbon or other weighty button to hamper the free movement of the diaphragm and the same may be so designed as to be practically of no natural Type 127A Type 127B period within the most used ranges of audibility. It may be designed to handle almost any voltage or may HOT WIRE AMMETERS be operated from a few standard plate bat- All transmitting sets, and continuo -us wave sets in particular, require am- teries in series. The progressive amateur meters to obtain the best results. You cannot depend on the other fellow's ear. is urged to make full use of the wonderful The circuits from input to output must be adjusted by ammeters. possibilities of this device and it is my belief that his efforts will be amply rewarded. The hot wire ammeter is the universal meter for this service. It is adapted As to the construction, it may follow, for direct current, low frequency alternating current and for radio frequency. more or less, along these lines : Use a rear It can be checked at any time on direct current and will be equally accurate on conducting surface made of a solid brass radio frequency. As this action depends on the fundamental I2R law, it always plate over which a very thin disc of mica is measures actual effective amperes. fastened, the thickness depending on the voltage it is intended to use. Separated We recommend for this service our Type 127 hot wire ammeter. This from this by a felt damping ring is a thin meter employs a platinum expansion element and is rugged and reliable. The brass diaphragm. Arrangements may be diameter is three inches and this meters made in front -of -panel and flush- mount- made so that the distance between the two ing models. It is supplied in a variety of convenient ranges. The price is also conducting surfaces may be varied mecaan- right. ically in order that different capacity values may be tried. With this much of a base whereon to stand, the experimenter is in a PRICE $7.75 fair way to try the results in various modulation circuits. Bearing in mind that the SEND FOR FREE RADIO BULLETIN gxoN source of modulation causes more trouble than any one thing about a radiophone circuit, the experimenter might well use a GENERAL RADIO COMPANY little of his time for the study of the vari- MASSACHUSETTS AVENUE AND WINDSOR STREET ous applications of the devices used. He will find that telephone engineers are very CAMBRIDGE 39 MASSACHUSETTS well versed on this subject and most of Standardize on General Radio Equipment Throughout. them have data at hand that cannot be obtained elsewhere.

3 A Method of Recording Wireless Signals by Means of a Morse Inker (Continued front, page 813)

connected across the secondaries of transformers carrying the wireless signals, rectified by the single-valve circuit shown. A condenser of .002 mfd. is in "shunt" with the primaries of their transformers in order R.F. TRANSFORMERS WAVELENGTH RANGE to permit the oscillations passing freely, TYPES T -xx, T -ria, T -xxb which otherwise would tend to be "choked" 16o -5oo METERS if passed directly through the windings. Now the fluctuations in the potentials of RADIO FREQUENCY AMPLIFICATION the grids of the triodes A and B cause an increase in the currents flowing in the an- Introducing two new MU -RAD R.F. amplifier transformers Type T -11a and T -1Ib odes circuits, which is equivalent to a de- We have again anticipated the entire field in multi -stage R.F. amplifier design. Users already know crease in the effective resistance of these the fine results obtained by using two or three MU -RAD T -11 transformers for 2 or 3 stage amplification; triodes. The balance of the bridge is, there- but we have developed and protected our rights :n a method for obtaining still greater amplification. The load in the plate circuit of a vacuum tube is reflected into the grid circuit through the grid -plate fore, upset and a current flows through and capacity, and maximum amplification for more than one stage can therefore only be obtained by proper operates the relay, which takes the place of recognition of this fact in its influence upon the design of the transformers in each stage. Other manu- facturera use the same transformers in every stage. MU -RAD uses different transformers. the bridge galvanometer. In the other two For one stage amplification, use Type T -11 between amplifier tube and detector. (Usually equivalent limbs of the bridge resistances are inserted to two stages with other transformers). of For two stage amplification, use Type T -11a between first and second amplifier tubes and Type T -11 values equivalent to those of the triodes. between second amplifier tube and detector. The inker is, naturally, connected in series For three stage amplification, use Type T -lib between first and second amplifier tubes, Type T -11a with a battery between second and third amplifier tubes, and Type T -l1 between third amplifier tube and detector. and the contacts of the relay. DEALERS: Write. R.F. Amplifier transformer Type T -I $9.00 The valves shown in Fig. 2 for condens- R.F. Amplifier transformer Type T -I la $9.00 ers and resistances will serve as a R.F. Amplifier transformer Type T -1 lb $9.00 guide in connecting -up such a system, but obviously MU-RAD LABORATORIES Asbury Park, N. J. St. Louis, Mo. they can Distributors west of Mississippi River. THE BENWOOD COMPANY, INC., ST. LOUIS, MO. only be approximate and must be amended to suit the types of triodes used and the transformer windings. The special feature of this circuit is that The material contained costs thousands of dollars to assemble. You can get a copy of a current will only pass through the relay bound volume No. 2 of Radio News for only $2.5O plus postage. York City circuit when signals are being received. so Experimenter Publishing Company, Inc 236A Fulton Street, New that there is no permanent current through

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RECEIVING SETS (Crystal) No. UC -1803 Radio Corp. .000025 MF. 10,000 AMPLIFIERS $5.00 "Aerlola Jr." Westinghouse, complete with detector and two stage volts phones $25.00 No. DA Westinghouse, No. -1806 Radio Corp. .002 MF, 6,000 volts 7.00 Brandes "Superior" in mahogany cabinet $ 68.00 U0 "Radiola" De Forest, complete with Brandes No. RORiC Grebe, two stage with automatic "Superior" phones 25.00 filament control jacks 55.00 CONDENSERS (Grid and Plato Types) Radio Service Type S -8 without phones, splendid No. NORD Grebe, Det. and two stage with No. TX-570 Radio Corp. .0025 MF 2.00 value 7.50 automatic fil. control jacks 75.00 No. UC -569 Radio Corp. .001 MF 1.50 No. 2634 Amrad, Det. and two stage in ma- No. UC -568 Radio Corp. .0005 MF 1.35 hogany cabinet. Splendid value 47.50 No. UC -567 Radio Corp. .00025 MF 1.20 RECTIFYING DEVICES No. UX -543 Radio Corp. Condenser Mtg .50 No. UV -216 Radio Corp. "Kenotron" 20 watt type for UV-202 tubes 7.50 TRANSFORMERS 150 watt AMPLIFYING Type) No. UV -217 Radio Corp. "Kenotron" No. UV -712 Radio Corporation 7.00 CONDENSERS (Filter for -203 tubes 26.50 .5 MF. 750 volts.... 1.35 type UV No. QO Clapp- Eastham, semi -mounted No. UC -1631 Radio Corp. No. P -1 DeForest 20 watt rectifying tube for 4.50 Radio Corp. 1 MF. 750 volts.... 1.85 No. 50 Chelsea, new type No. UC -1632 use with 5 watt tubes 7.00 No. UC -1634 Radio Corp. .5 MF. 1750 volts.... 1.50 No. UC -1635 Radio Corp. 1 MF. 1750 volts.... 2.00 ANTENNA WIRE RECTIFYING DEVICES (for "A" Batteries) drawn copper x(80 "Pittsco" No. 14 hard INDUCTANCES No. P -I Tungar, 5 ampere type, complete with lb.) lb. 0.40 C.W. 28.00 per 2 Corp 11.00 bulb special value at 40 No. UL -1008 Radio bulb 18.00 500 ft No. P -1 Acme 8 00 No. P -2 Tungar, 2 ampere type with 7 strand No. 22 tinned copper, per 5 amp. type 15.00 "Pittsco" 0.01 No. P -3 FF Battery Booster, ft. 4.25 500 ft. C.W. POWER TRANSFORMERS Special value at No. UP -1630 Radio Corp. 325 watts 25.00 REGENERATIVE RECEIVERS 38.50 "Pittsco" 7 strand No. 20 phosphor bronze No. 11P -1016 Radio Corp. 750 watts No. C3ì. -3 Grebe "Relay -Special" 175 -600 me- 0.02 volts, mid 20.00 65.00 per ft. 0.02 Acme 200 watt 350 -550 ters 500 ft. special value at Acme 200 watt 350 -550 volts, unmtd 16.00 No. Clt -5 Grebe 175 -3000 meters, "Super - special" complete set 80.00 REACTORS No. CR -8 Grebe 175 -1000 meters, complete set, "B" BATTERIES FILTER 80.00 1.50 -1626 160 Milliamperes 11.50 latest "Relay Special" No. 7623 Standard 22.5 volts, small No UP No. CR -9 175 -3000 meters, complete set large 2.65 No. UP -1627 300 Milliamperes 15.75 Grebe No. 7625 Standard 22.5 volts, with det. and 2 stage amplifier, self contained, No. 7600 Standard 22.5 volts, variable, 161/2 to 130.00 3.00 Corporation) "A Masterpiece" 221/ volts GRID LEAKS (Radio No. RA Westinghouse, 100 -700 meters, very Standard 22.522. volts, large, variable, 15 No. UP -1719 for 5 watt tubes 1.10 68.00 No. 7650 3.50 1.65 selective, mahogany cabinet variations No. 1P -1710 for 50 watt tubes No. RC Westinghouse, RA receiver and DA 763 Everready 22.5 volts, small 2.25 No. UP-516 1/2, I, 1.5, 2 or 3 megohms each cabinet, a No. 1L25 Det. Amplifier combined in one No. 766 Everready 22.5 volts, large, 161/2 to 221/2 3.00 complete with mounting splendid unit, compact 130.00 Gred leaks only, each .75 volts 3.50 No. 627 Ace, 45 volts, variable HOT WIRE METERS TELEPHONES No. P -1 Roller -Smith 0 -2.5 amperes, flush mtg No. 56 2000 ohm double 5.00 COILS (Duo-Lateral) 4.75 Murdock DL-300 1.75 Special value at No. 56 Murdock 3000 ohm double 6.00 DL-25 $1.40 Corp. 0 -2.5 amperes 6.00 5.00 1.40 DL-400 1.80 No, UM -530 Radio No. CW -834 Western Electric 2200 ohms DL-35 2.00 -533 Radio Corp. 0 -5 amperes 6.25 with new headband 8.00 DL-50 1.50 DL-500 No. 13M Brandes, "Superior" DL-600 2.15 Brandes "Trans- AtlanCcs" with new headband 2.00 DL-75 1.50 Type) 4.00 1.55 DL-750 2.35 JACKS (Radio Brandes "Navy Typo" wills new headband DL-100 open jack .70 2.00 DL-150 1.60 DL-1000 2.60 No. 61 Pacent Baldwins Type C 3.00 No. 62 Parent closed jack .85 Baldwins Type F 3.00 DL-200 1.65 DL-1250 1.00 1.70 0L-1500 3.50 No. 63 Parent 2 circuit Baldwins Type F 4.00 DL-250 No. 65 Parent three spring automatic filament Baldwins Type C, unit only 6.00 control type 1 20 Federal A. and N. Type 2200 ohms 8.00 COIL MOUNTINGS No. 66 Parent five spring A. F. C 1.50 Federal A. and N. Type 3200 ohms 10.50 No. LO -100 De Forest 3 coil mounting with reduced 6.00 LOUD SPEAKERS gears. price with No. LC -101 De Forest 3 coil mounting No. R -3 Radio Magnavox, new type horn, very VACUUM TUBES and wooden base 9.50 45.00 No. UV 200 Radiotron detector 5.00 gears latest model 6.50 No. 400 Remlcr 3 coil mounting with base and -1 Vocaloud, station type 35.00 No. IJV -201 Radiotron amplifier No. P 8 00 extension handles 6.50 No. 400 -W Federal Plenophone 14.00 No. UV -202 Radiotron 5 watt No. UV -203 Radiotron 50 watt 30.00 110.00 MAGNETIC MODULATORS No. 15V -204 Radiotron 250 watt CONDENSERS (For CW work) Note. Radiotrons sent postage and insurance 1/2 to 151 amperes 9.50 -All UC -1014 Radio Corp. .002 MF. 3000 volts 2.00 No. UT -1643 anywhere in U. S. A. Send us your No. No. -1357 11/2 to 31/2 amperes 12.50 prepaid 17C -1015 Radio Corp. .0003, .0004, .0005 UT for. Radiotrons. No. UT -1367 31/2 to 5 amperes 17.00 orders 11IFD .7500 volts 5.40 No.

"Let 'PITTSCO' products, super -service and delivery solve your Radio problems" SEND US YOUR ORDERS TODAY! P. D. PITTS CO., Inc. A. 12 PARK SQUARE BOSTON MASS., U. S. BRANCH BRANCH 276 WORTHINGTON STREET 193 WESTMINSTER STREET SPRINGFIELD, MASS. PROVIDENCE, R. I. rr-rr-..r.m., . -_

www.americanradiohistory.com b54 Radio News for March, 1922

the relay, as would be the case if connected directly in the anode circuits. In this manner it consequently follows that the relay can be set to a most sensitive adjustment and so made to operate on reasonably weak Another fl a G sig- = i - Achievement nals.-Abstracted from The Model Engineer and Electrician.

The TELMACOPHONE A Radio System for Here is Height of Simultaneous Sending and the Telmaco Perfection Receiving Equipped with Baldwin Type C Unit, inverted horn, reflected tone. Equal to any other (Continued front page 823) horn twice its length. Designed and perfected by expert acousticians, Complete in every 1 .11 1 1 1 1 :11 11 1. 1 1. 1 1 1 1 11 1 1 1 11 11111 1/ 11/ 1 1 11 1 1 1 1 1 1 . ..1 11 11 11 11111 11 1 11 1 11 1 1111 1 1 1 1 1 :: 1. 11 11 1111 111 1 1 1 detail 111 1 1. 111. m 133111. 13" impedance to currents of all other wave- lengths. Don't be misled into buying a loud No Extras to Buy. In order speaker to receive a signal the antenna offered for less, and expect circuit is satisfaction; tuned to the wave -length of that for a loud speaker of qual- Nothing to get signal by the primary condenser. ity cannot be for The sold less. Only after out of order. secondary circuit is adjusted in the usual the most exhaustive tests and compari- way. sons with the other loud speakers; and DETAILS OF THE TRAP CIRCUIT only after the most thorough research, The laboratory trap circuit is extremely simple and tests, and field demonstra- consists- of a variable air condenser tions has the Telmacophone been per- and a small inductance. Fig. 5 gives fected, and offered now, for the details the first of the condenser and coil. time, to the public. It is hoped that the amateur can make use of this system to improve the ever in- Telmaco Amplifiers, Receivers, Detec- creasing efficiency of amateur radio. With tors, Variometers and Variocouplers this arrangement it is possible for one to have earned a national reputation for send a message from station A to station B quality endurance and satisfaction not at the same time a message is being sent excelled by any other line. You can by operator No. 2 at station B to operator expect equal satisfaction from the Tel- No. 2 at station A. For radio telephony it eliminates . macoplaone. the necessity of pushing a button Fully Guaranteed or throwing a switch to talk and allows two to converse by radio in just the same manner If you haven't our complete catalog "N ", be sure to write for it now. as they would by telephone.

(1111111111111111111111111111111111111111111111111. Dealers ! We distributors for are nearly all standard lines. Full discounts on the Telmaco- phone. Write for proposition on our complete line. A German Trench Radio Set =_ (Continued front page 805) .1.111111M111 RADIO DIVISION 12 11,11,1,11111,11,11111,1,1,11,,,,,11,17 (Empfangen) ; 3. Receive with Load In- ductance (Empfangen Telephone Maintenance Co. mit Zwischenkreis.) ; 4. Prufen (Test). The last position is to 17 N. La Salle St. adjust the crystal detector using the buzzer. Chicago, Ill. but not emitting energy from the antenna. The lower left -hand control is the Vario- meter Tuning device (Abstimmung). The right -hand lower control is the Receiver Coupling (Kopplung) for receiving with EXPERIMENTERS e and without Loading Inductance (mit Buy your wire direct from the makers, and save money. The following Zwischenkreis, Ohne Zwischenkreis). At prices on plain enameled magnet wire should interest you. the right -hand end can be seen the sending key, jacks for No. 12 $ .29 per lb. No. 22 $ .44 per lb. No. 32 $ .75 per lb. the storage battery leads and No. 13 .30 per lb. No. 23 .46 per lb. No. 33 .79 per lb. jacks for the telephones and the detector No. 14 .31 per lb. No. 24 .48 per lb. No. 34 .83 per lb. adjusting control. No. 15 .32 per lb. No. 25...... 50 per lb. No. 35 .88 per lb. Now considering No. 16 .33 per lb. No. 26 .53 per lb. No. 36 .95 per lb. the receiver, the trans- No. 17 .35 per lb. No. 27 .56 per lb. No, 37 1.05 per lb. mitting variometer is also used to tune the No. 18 .37 per lb. No. 28 ,59 per lb. No. 38 1,15 lb. primary of the receiver circuit. No. 19 .39 per lb. No. 29 .63 per The per lb. No, 39 1.40 per lb. transmitting inductance is also No. 20 .40 per lb, No. 30 .67 No, 40 1,90 per lb. used as the No. 21 .42 per lb. No. 31 .71 per lb. primary of the receiving coupler. The secondary of the receiver No order accepted for less than $1.00 or less than one pound of a size, Terms cash with is rotated within - order. Add 10c for each spool. Do not forget to add postage. the transmitting inductance. The receiver secondary is aperiodic and used in connec- American Enameled Magnet Wire Co. Muskegon, Mich. tion with a sensitive crystal detector. The stopping condenser is of unusual construction, consisting of two fine enameled copper wires wound side by side on a spool, the enamel covering of the copper being the dielectric. This receiver is capable of efficient NEWEST AND BEST YET reception on 190 and Type A Honeycomb Receiver 210 meters and for and Detector Combined $28.50 receiving from a different headquarter on The ideal receiver for amateur use. will receive radio phone broadcasting stations, amateur, com- a different wave- length, a load is mercial, ship and time stations. Set wired complete in cabinet mounted on Farmica panel with three coil con- coil mounting, .wo variable condensers, socket, ;rid leak and condenser with dials, binding posts, nected in series with the antenna circuit. rheostat., etc. Introductory price, $23.50. Referring to Fig. 2, the control switch is FERBEND ELECTRIC CO., 19 East South Water Street, CHICAGO shown. This unit is of the cam type, having silver contacts and positive action. All the necessary connections are automatically made for the four positions. Edelman's Loud In back of this switch can be seen the M U LT I T O N E Speaker jack for the detector and in, directly back M U LTITO NE No. 1. A complete clear amplifier with scientifically proportioned horn $15.00 [Loud, clear] No. 2. Same horn only for attachment to Baldwin or other receivers 6.00 of that, the switch for changing the trans- No. 3. Attachment for victrola or phínograph. Makes your own amplifier 5.00 mitting wave- length. The special buzzer is AMPLIFYING TRANSFORMERS No. 4. Little (irrt, for one or two step tube sets 4.20 V. T. SOCKETS 90o each. FILAMENT RHEOSTAT $1.00 each, Postage Paid. in the center and the construction of the Save time. Order direct. You are sure to be satisfied. Agents wanted. spark gap is also clearly shown. A piece PHILIP E. EDELMAN, . Radio Dept. 39 CORTLANDT ST., NEW YORK CITY, N. Y. of mica is supported over the spark gap to prevent rain from short circuiting it, in the

www.americanradiohistory.com Radio News for March, 1922 855

APPARATUS THAT RADIATES QUALITY

TYPE 330 DETECTOR PANE PRICE $g,oo

Note the exclusive Remler Features

THAT "Remler Apparatus Radiates Quality" and far excels other apparatus is conclusively proved by the following specifications of a Remler Panel when compared with that of any other panel on the market. Panel is genuine molded bakelite, 5 x 7/ x 3/16 inches, with a highly polished glossy black surface; lettering and scale recessed and filled with white enamel. The filament current is controlled by REMLER No. 810 RHEOSTAT, back mounted, and provided with an open position. REMLER No. 93 POTENTIOMETER connected across the storage battery provides close adjustment of plate potential necessary for sensitive detector action. Flexible leads for the B. Battery connection provided for termi- A- Battery nals at back of panel. The rheostat and potentiometer knobs are polished bakelite 1% in. diameter. The GRID LEAK is variable and grid condenser, back mounted, is the correct capacity for the new gas r ontent detector tubes. Maximum fila- Potentiometer ment insured by REMLER No. 92 V. T. SOCKET which is used to support the tube vertically. Induction and ground hums eliminated by its all bakelite construction. A view of filament permitted through an orifice in the panel. Binding Plate Voltage posts and all metal parts are finished in polished nickel. The panel is mounted on a hardwood base 7% x 31/2 inches, finished black, but can readily be mounted in a cabinet. The wiring is the approved bus bar type, and is laid out Control so that the input and output terminals are at opposite sides. Send for Bulletin No. 1002 and 1003 on the Remler Bakelite Detector and Amplifier Panels, Types 330, 331 and 333. Two or more of these panels can be mounted in a cabinet to make any desired detector -amplifier combination. DEALERS: -There is an exclusive and very profitable proposition for you on Remler apparatus. Write for full particulars. AMATEURS: -Write for 32 -page Remler Catalogue. RE LER RADI O M 248 FIRST ST. SAN FRANCISCO,CAL. E 'GENERAL l M GHR 154 W. LAKE ST. CHICAGO, ILL.

www.americanradiohistory.com 856 Radio News for March, 1922

event that the cover has to be opened to change wave-lengths. In Fig. 3 the same items are shown on the top shelf, and in the right -hand corner FACTS WORTH READING! will be seen the special wire wound stopping condenser previously described. On EXTRACTS FROM A STRANGER'S LETTERS the lower shelf from left to right, the variometer, external reactance, mica condenser, Craig, Alaska, to/2t /21. inductance Experimenters and key resistance are shown ill Information Service, order. The buzzer 45 Pinehurst Ave., New armature also has a high York. resistance winding and current runs through Gentlemen: this armature when the control switch is Received parts of your 16o to moo meter receiver, just completed the set in the sending position, through the key re- and given same a few days' tests. sistance. This keeps the contacts moving regularly and when the key is pressed, al- Am very much pleased and wish to state that it is the best receiver I have ever worked. The latest lowing the main current to flow, the pos- commercial receivers (Navy Tuners) approach yours sibility of the contacts very closely in selectivity. Can copy stations Ipoo miles distant sticking, is small. thru interfer- The same items are shown in the rear view, ence by stations of equal power only too miles away, both tuned to boo meters. Fig. 4. Some of the Pacific Coast amateurs come in QSA without regeneration. Heartily For actual operation, recommend your BLUE PRINTS to anyone wanting it was only neces- a first class design. sary to erect the antenna between two sticks (Signed) Winfield S. H. \Vood. and connect to the set. The ground was in form of a counterpoise, an insulated wire 25' long, run under the antenna. Then the Craig, Alaska, II /22/21. battery and phones are plugged in and Experimenters Information Service, everything is ready. The operator then 45 Pinehurst Ave., New York. simply changes to either receive or sena Gentlemen: position with the control switch, in both cases tuning with the variometer. On boo meters I get everything en the Pacific Coast. Stations 15oo to 2000 The miles come in instrument shown was manufactured very loud. I get ship:; and 'KW land stations in the Hawaiian by a company in Islands fine. Berlin. Some actual tests were made with one of these instruments in The best work of your receiver is in Phone work. After a few days' test Washington in the summer of 1918. Two I was able to get the Avalon Phone fine and since have heard them nightly and complete stations were used, the second one sometimes an hour before dark. After a few nights' adjustment was able to being an exact duplicate of the German in- get the bulletins and music from the Fairmont Hotel in San Francisco. Next I strument as manufactured by the Marconi picked up the music from the Post Intelligencer Office, Seattle. (Note: This company. Mr. Paul F. Godley was at one phone is to watt Output). Have never heard this feat duplicated. Everything instrument and Mr. John Miller and the on one bulb. writer at the other instrument. No diffi- (Signed) Winfield S. H. Wood. culty was experienced in maintaining constant two -way communications over a distance of 8.3 miles of thickly wooded and The above receiver built from or.e of the 22 Blue Print Designs we hilly country. The antenna in each case was produce. Inspect them at your dealer or write for new illustrated 25' long and approximately 2ó high. The counterpoise was an insulated wire 25' Bulletin "B" long laid under the antenna. It was found by experiment that by pointing the two antennae toward each other and having the EXPERIMENTERS INFORMATION counterpoise pointing away from the an- SERVICE tenna 18o degrees, the antenna current was 45 PINEHURST AVENUE, NEW YORK CITY reduced, but the signal audibility increased in each case. This was due to the fact that the energy was concentrated and propagated in the desired direction, rather than equally distributed over an entire circle. The antenna current averaged .8 of an ampere with The Detroit Electric Co. an input of approximately $o watts. Inci- dentally, while making the receiving tests _Announce the opening of their new four -story building de- in addition to hearing each other, both receivers also picked up a radiophone from voted entirely to Radio. Our Mail Order Service is the best the Bureau of Standards laboratory, ship at sea and the Arlington station, demon- in the country. strating that the receiver was truly ape - Get our C talog No. 5 riodic. A similar equipment is also manufactured having an input of 200 watts. In this case DETROIT ELECTRIC CO. the buzzer steps the 12 volts up to 250 volts and the current is then stepped up through 113 -5 East Jefferson Ave. DETROIT, MICH. a power transformer to to,000 volts. The construction is very similar, only heavier, and instead of a storage battery supply the power is provided by a generator mounted on a bicycle and driven by foot power.

CANADIAN AMATEURS! Portable Sets prove most useful during Army HEADQUARTERS FOR THE BEST Manoeuvres RADIO EQ U I P M E N T (Continued from page 805) Write for Price List performance. Communication was established and maintained between the marching Marines and SCIENTIFIC EXPERIMENTER, the radio station at Quantico, Virginia, by Limited use of the portable wireless equipment de- 33 McGILL COL:.EGE AVENUE MONTREAL scribed in the photograph reproduced with this article. Radio apparatus installed in aeroplanes functioned without a hitch and Insure your copy reaching you each month. Subscribe to Radio News -$2.5o no difficulty was experienced in maintaining a year. Experimenter Pub. Co., 236-A Fulton St., N. Y. C. communication with stations on the ground. The execution of Infantry experiments

www.americanradiohistory.com Radi News jor March, 1922 857 Marshall - Gerken "Distinctive Apparatus" New Series of Interpanel Units Detectors and Amplifiers

Detector -Front View Detector- Rear View Amplifier Detector The Amplifier units, made to These new Detector panels are in match with the new detector panels keeping with our standard of are identical in their design and "Quality Always." They incor- construction with the addition of an porate the latest developments in amplifying transformer that has instruments of their kind and have been built to our oval specification. that distinctive touch characteristic The use of one of these amplifying of Marshall-Gerken products. These units produces very noticeable in. units match perfectly with our am- crease in volume. Two of these plifiers and together they make a units are sufficient to use with any wonderful combination. loud speakers. Amplifier individual cartons, Type A.W. i -o In individual -in cartons, each $1i.5o. Equipped each $5.50. Equipped with Stand- with Standard Federal Jack. ard Federal Jack. Detector -Amplifier Combination To these units can he added additional single stages of amplification until the desired volume is obtained. To add these additional stages of amplification, it is only necessary to connect the "in put" binding post of the added unit to the "out put" binding post of the last unit employed. This combination of detector and amplifiers can be placed in a cabinet to match the receiver. Manufacturers - Jobbers - Dealers Our new Catalog is ready with complete description and illustrations of our entire line -VARI- OMETERS - VARIOCOUPLERS - DETECTORS - AMPLIFIERS - DIALS - SOCKETS- RHEOSTATS- NON -REGENERATIVE RECEIVING SETS - BINDING POSTS - CONTACT KNOBS - STOP PINS - SWITCH LEVERS -COMPLETE AND SMALL ACCESSORIES. DEALERS -We are territorial distributors for RADIO CORPORATION - WESTINGHOUSE - MAGNAVOX- BALDWIN- REMLER- CUNNINGHAM- REILLY KLOTZ "ARKAY HORN" -FEDERAL - RHAMSTINE- ACME -WESTON AND JAVEEL METERS -HIPCO B BAT- TERIES- COOPER STORAGE BATTERIES -A. P. TUBES, etc.

The Marshall - Gerken Company Manufacturers and Jobbers Toledo, Ohio

www.americanradiohistory.com 858 Radio News for March, 1922

called for a manoeuvre in which the Third and Fourth Brigade captured and estab- Popular Mail Order Specials lished an advance base Somerville moulded -top binding on Wilderness Beach. posts $0.10 Amrad receiving tube rheostat, no dial $1..00 Westinghouse Model, metal binding posts .15 Amrad "A" This organization supported the landing and Somerville bat. potentiometer, no dial ' 1.25 Bakelite VT socket .75 Cyclone 221/2 v. "B" battery, aided in Somerville .Bakelite H -C coil plug tapped model 1.75 the seizure of the general line, Chirad variometer, no dial 5.00 De Forest geared triple coil mounting 6.00 Chirad vanocoupler, no dial known as Wilderness Tavern-Payne Duolateral coils, 100 turns, and up, 10% 4.00 disc Amrad variometer, no dial 6.10 Hailey -Tanner. An artillery air -going General Radio .001 mfd. variable condenser Amrad variocoupler, no without $3.25, dial 6.90 machine, dial, with 4" Somerville 4.75 Amrad vernier variometer, panel type 1.50 equipped with radio apparatus, as- Amrad shielded ampliformer 6.00 sisted the artillery forces in fire control. SPECIAL -ACME UNMOUNTED 50 An observation airplane, also carrying wire- watt -$12.00 less equipment, negotiated a search of all CW Transformers -while they last -10.25 lines of approach accessible to the make -- $8.50 RADIO SERVICE CW INDUCTANCE-$7.50 believe enemy, their observations being reported to the command post, the Fourth Amrad 48 mfd filter condenser, NEW $8.00 75 watt Acme Acme 200 filament heating trans. $12.00 Brigade. A contact watt, 350 -500. V. CW transformer...20.00 Type JX 0 -15 aircraft unit, flying Type J1( hand A.C. voltmeter 8.00 microphone, with cord 6.00 Radio Corp. UC 1014 3008v. condenser 2.00 over the lines of mock warfare, informed Federal universal plug, for above 1.75 Radio Corp. Wimco knocked %-l% amp. Magnetic Modulator 9.50 the expeditionary force -down C'W inductance 8.50 Radio Corp. 11/2 -3 amp. Magnetic headquarters of the Bunnell CW transmitting key Modulator 12.50 3.00 Radio Corp. 3 -5 amp. Magnetic Modulator 17.70 progress of the attack. The Bunnell line rheostat, 28 ohms 3.00 warfare fronts, whenever changes took place, were sketched in forms of maps and dropped from the air -- EVERYMAN'S SECTION at headquarters. - I lil No greater satisfaction n b _ can be obtained, 1n receiving e radiophone broadeastings, than by purchasing the fol- The study of Infantry problems in I O lowing complete outfit from us. human conflict, when radio telephony and radio- Complete Antenna and Ground Outfit s 7.00 Westinghouse Receiver telegraphy are put into service, was ap- I1Ì II' 11 +' ' Cabinet 130.00 +s 1 UV 220 Radiotron Detector Tube 6.00 proached from another angle in the Wilder- l' 2 Amplifying Tubes @ $6.50 13.00 I ness Run manoeuvres. I 1 2 No. 766 Eveready "B" Batteries @ $3 8.00 The First Battalion, 1 6 V. 60 Amp. Storage Fifth Regiment, II Battery 15.00 made an assault on Payne's g ,i 1 FederalFederal. 2200 ohm Headset 8.00 Ridge, conducting ,, 1 1 Firco Universal Cord Plug for above an assimilated bombing 2.50 raid on i the enemy I iÌ ammunition dump at f $1ß6.b0 I WEb11NGHOUSE ,»/ 1 REICEIVEB $130.00 Dempsey, and also assisted in the advance. 6 {'III This is the improved model, completely shielded, with A command to d v ,' L Ill smooth running Rheostats and provisions for using aeroplane flying over the Iine r "soft" detector tube. (Sent express prepaid). of moving infantry reported the progress -,_ YOU CAN HEAR. THU RADIOPHONE NEWS AND CONCERTS of the attack to the battalion headquarters. An observation flying machine hovered over WE ARE NOW STOCK DISTRIBUTORS OF the make- believe enemy lines and dropped bombs on their fronts to show the hostile WESTINGHOUSE AMRAD positions. An artillery airplane assisted in í RECEIVING EQUIPMENT the control of artillery fire by the use of ourt radio equipment in spotting. The decks of `0IV " ' SEND US YOUR OUR "OK" MEANS a battleship and an airplane carrier had ON EvEítYTnmc ORDER TODAY! YOUR SATISFACTION been marked on the ground and were em- WE SEW ¡ Our Enlarged "Add -A- Page" Catalog -25c ployed during the manoeuvres as a mount for the anti -aircraft guns and landing field, SPECIAL !.....THE NEW AMRAD "S" TUBE NOW READY respectively. The tube without a filament, which will revolutionize amateur CW. (two needed -instructions and hook-up included.) We will be the " $7.50 EACH first distributor to have a stock! ORDER NOW! PORCELAIN SOCKET FOR SAME, 15e EACH A Sea -plane High Power SOMERVILLE RADIO LABORATORY Bulb Transmitter SALES OFFICE, 178 Washington St,, BOSTON, MASS. (Continued from page 804)

receive switch. A little to the left of these switches are the antenna inductance con- INSULATION trols, the 600 -meter control at the top, and the I,600 -meter one at the bottom of the is the prime factor in building wireless apparatus inasmuch as it must have great set. To the right, on the other side dielectric of the strength, be moisture proof, mechanically strong, and yet easily wave- change and antenna switches will be machined. found another pair of controls, small knobs sliding in These qualities are all embodied in curved slots. These controls vary the plate -grid coupling of the set. Finally at the left of the panel near the top will be GENUINE found the antenna lead -in. Near the bottom will be seen the Century buzzer used for tone transmission. Below this at the extreme left are the microphone plug and BAKELITE -DILECTO jack, and right next to them the three point signal switch, for connecting either for straight C.W., buzzer modulated telegraphy "The Perfect Insulation" or speech. which we manufacture in sheets, rods, tubes and special shapes. The rear view shows very clearly the tubes and tube mountings with springs for Bakelite -Dilecto should be used for panels, coil cores, and other insulating absorbing heavy shocks and vibration. The parts in your wireless outfit. two separate coil systems for the two waves are clear, and Write our nearest office for full information about all of our products. also the mechanism for altering the coupling between the coils. The contacts of the antenna switch are seen at the top center, and the three-point signal THE CONTINENTAL FIBRE CO. switch is seen at the bottom, directly under NEWARK, DELAWARE the right hand tube. NEW YORK, 233 Broadway CIHICAGO, 332 S. Michigan Ave. The approximate ranges of the set using PITTSURGH, 301 Fifth Ave. SAN FRANCISCO, 525 Market St. the different methods of transmission are LOS ANGELES, 411 S. Main St. TORONTO, Ont., Canada., as follows: On 1,600 meters. 15o 89 Wellington St., West. miles for C.W., 730 for buzzer modulation and 110 for speech. On 600 meters, 250 miles for C.W., 200 for buzzer modulation MONEY FOR YOU-Add to your salary -Make extra pin money-Start a lucrative business and about of your own. Spend an hour each day taking subscriptions for the Radio News. We'll I50 for speech. - pay you well and you'll enjoy the work. Write for full particulars. Circulation Dept:, Radio News 236A Fulton Street, New Work City. *Photos by courtesy of General Electric Co.

www.americanradiohistory.com Radio News for March, 1922 859

The Stromberg - Carbon i No. 2 -A Radio Head Set These Stromberg- Carlson Radio Head Sets reproduce broadcasted, long distance, vocal or musical sounds with unequalled distinctness. Fine tonal qualities and extreme sensitiveness, are features of this high -grade piece of apparatus. For the past eight years its makers have been recognized leaders in manufacturing professional Radio Head Sets. Back of that is twenty -eight years' service in building voice transmission apparatus for telephone companies. Stromberg- Carlson Telephone Receivers and Radio Head Sets are known in every part of the world where telephones and radio stations are installed. This wide experience has enabled us to produce a new perfected Radio Head Set, a high -grade apparatus at a moderate figure - combining the important requirements of sensitiveness with convenience and comfort No. 2 -A Radio Head Set, for the wearer. Complete, $7.50 The No. 2 -A Radio Head Set comprises four distinct units; two receivers, head band are nickel finished. Another feature of merit, in and regard to the design of this head band is a pro- 5 foot cord. vision for separating the receivers which permits two observers listening in on a circuit simultaneously with but one Stromberg- Carlson No. 2 -A Head Set. This accomplishment is simple because The Receivers the Head Band is provided with spring stirrups which engage the receivers, in such a manner, Receivers are equipped with a one -piece bipolar that either receiver may be disengaged from the permanent magnet, of high grade magnet steel; heád band by simply spreading the stirrups. provided with phenol fiber spool heads, slotted soft iron pole pieces, corrosion proof diaphragm, enameled copper wire coils. All parts are encased in a receiver shell of cast non -magnetic insulating material, that is unaffected by either The Cords moisture or temperature changes. Each coil is wound to 500 ohms. The coils are connected in Each No. 2-A Radio Head Set is equipped with series. This gives a combined resistance of 2000 a 5 -ft. brown silk, moisture proofed, receiver ohms for the 4 coils of a No. 2 -A Radio Head Set. cord which is forked in two branches, one / branch for each receiver. This forked con- / struction permits two persons to use the head set simultaneously when desired- / Head Band a feature of great convenience. / Stromberg- The Carlson Tele- A head band is furnished of the spring wire type, phone Mfg. Co. covered with heavy brown webbing, correctly Rochester, N. Y. shaped, light in weight and comfortable to the / operator. Knurled thumb screws are provided on / Send me your free both ends to permit locking the adjustment after bulletin 1029 -R describing it is once fitted to the head. Exposed metal parts / / your No. 2 -A Radio Head / Set. / Stromberg- Carlson Telephone Mfg. Co. // Name ROCHESTER, N. Y. / / Address

www.americanradiohistory.com 86o ttadio News for March, 1922

,,,,,,,,,,,,,,,,,,,,,,11,1,.,,,,,,,,,1111,1,,,,,,,,,,,,,,,,,,,,,11,11,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, "CHI -RAD" APPARATUS Radio Digest K -D DETECTOR- AMPLIFIER (Continued from page 833)

and make it possible to overcome the shielding effects from nearby high buildings. A counterpoise ground system will he used, this type having proven very effective with the other antenna arrangement. Excellent work has been done by this radiophone, its voice and music having been heard as far as fifteen hundred miles at sea, and eight hundred miles being a nightly occurrence. This is remarkable ..z/, - when it is considered that but five watts 43 are used. Together with the erection of the new antenna system, a much higher powered outfit is planned, and apparatus is now on the way from the east to complete the installation. When completed, two 5o -watt tubes will x be used, and it is expected that the range will include from Sitka, Alaska, on the north, to Mexican coast on the south, and from Honolulu to well inland eastward. The wave will probably be be-. Aga 35o ' ¿ ti .. ^ tween and 400 meters, and the hours , of operation the same as at present, nine to nine thirty P. M. daily. Price Complete as shown, $25.00 Add PP on 10 lbs. Everything to build a high grade detector and two step amplifier at the usual "Chi -Rad" price. THE CHICAGO POLICE MOST Immediate Delivery -send in your order today! EFFICIENT. SPECIFICATIONS By Charles E. Wiley. Solid oak cabinet, hinged cover to take panel 7" x 9 ". I Formica panel 7" x 9 ". 3 Fada Rheostats. i Roll spagetti tubing. The Chicago Police Department under 2 Thordarson Amplifying Transformers. 2 Double Federal jacks. 8 Binding posts. the direction of Chief Charles I Roll tinned copper wire. I Grid Condenser. I Single Federal jack. Fitzmorris 3 DeForest Sockets. is rapidly becoming the most efficient police force in the United Watch for announcement of the new "Chi -Rad" loud speaker. A real instrument at the right price. States. Chicago was Dealers wire or write for discounts on "'Chi -Red" Apparatus-it is reasonably priced-yields you a real the first to perfect, on a large scale, a sys- profit and is in demand by discriminating Radio Men everywhere. tem of wireless communication from the GORTON ENGRAVING New Gorton Engraving Machine just installed -send as your panels and we engrave to your specifications. headquarters to the police on his beat. 5ç per letter, minimum charge of $2.00. Send sketch on paper same size of panel. By the means of the latest police wire- Radio Manufacturers engraved panels will enable you to market a real instrument, with small outlay for shop equipment. less radio, it is possible for the patrolman Let us supply you with any size panels completely drilled and engraved to your specifications. Write or mounted officer to catch from you the right price -the policy the air the stating full details, number of panels you can use and we will quote radio messages of his of "Chi -Rad." 508 S. DEARBORN STREET superior officer. This appliance is working wonders in the CHICAGO RADIO APPARATUS CO., Inc. CHICAGO, ILLINOIS apprehension of auto bandits. By means of a small receiving instrument which buzzes when calling the officer, by placing the receiver to his ear he is able Try Service to receive orders. He cannot talk back, as REYNOLDS RADIO there is no means afforded in answering. The police department has a portable "9ZAF" from DENVER "9ZAF" sending station or squad wagon, which can be rapidly moved for sending orders to Kennedy - RECEIVING OUTFITS - Grebe squads of police covering strikes, riots, etc. $250.00 -CR5 $ 80.00 Type 110 Universal GREBE DAYTON Type 2201 Intermediate 125.00 GREBE -CR8 80.00 POLICE TO USE RADIO. By Bert A. 281 80.00 -CRg 130.00 Teeters. Type Short Wave GREBE Following 75.00 a demonstration conducted by Type 525 Amplifier 85.00 GREBE -RORD radio officials at McCook field on Decem- Type 521 Amplifier 55.0o GREBE -RORK 55.00 ber 31, 1921, authorities of Dayton, Ohio, are contemplating the installation of muni- PHONES ANTENNA WIRE cipal wireless equipment as an aid to the Aluminum No. 14, per lb $I.00 police department in combatting crime. Baldwin Brandes (about 175 ft,) Under the tentative plans, a "central sta- Copper No. 14, per lb. 60c tion"' would be established at police Murdock Federal (about 80 ft,) headquarters, and four of the five police auto - mobiles would be equipped with both send- REYNOLDS RADIO CO., Inc. 613 19th Street, DENVER, COLO. ing and receiving apparatus. DISTRIBUTORS- Dealers, Write for Proposition During the demonstration, Chief of Po- i lice J. N. Allaback rode about the city in an automobile equipped with receiving sets, and at all times was able to hear and understand distinctly, matter transmitted by Radio Frequency Transformers radiophone from McCook Field, several miles away. Type RT -i, for the amateur and I was able to hear every word spoken," broadcasting range, 175 -500 meters. lw+j o said the chief in commenting on the dem- (Patent Pending.) ) onstration, "and the messages were as dis- e SONICC. tinct as any I have ever received over a $ 6.00 9 telephone. RATO' I see great possibilities in the use of ( Will work on all tubes. radio in the police department. We could relay messages to our machines in any part RADIO SERVICE LABORATORIES, Inc. of the city, giving them vital information ASBURY PARK, NEW JERSEY which might result in the prevention of 1 serious crime, or the capture of dangerous

www.americanradiohistory.com 861 Radio News for AParch, 1922

. } 'r'Ft N.3 . , \ E.f..v_..e.,.í..G:K3f;:'%.

Complete Sets to Receive the WIRELESS TELEPHONE CONCERTS

to the tremendous new interest in wire- miles. Under normal conditions you can hear voices and In response feet from less, created by the sweep of broadcasting stations all music by wireless telephone clearly 25 to 5o country, many styles of complete ready -to- the loud speaker. It is unusually simple to install and over the con- operate outfits have been developed. Continental has operate. Simply connect your Antenna and ground certain of these sets, of a wide price nections, insert tubes, hook on batteries, and you are carefully selected listed above range, which combine efficient service with simplicity of ready to listen. The price of this outfit as operation. is $246. there is set at $15 complete is truly "The For those who want the limit of perfection, The "Marvel" Ten, fc'r which we are sole wholesale Marvel of Radio." Within 25 or 5o miles of a powerful the Paragon R.A. on distributors. Many prominent experimenters who have broadcasting station, you can hear concerts clearly that it is knowledge of radio what- tested Paragon R.A. Ten, unanimously report a Marvel set. It requires no for telephone reception." This receiver so simple to install that you cannot go "unexcelled ever, and is employs the Armstrong Regenerative Circuit and is 24 wrong. per cent more sensitive and selective than its famous Another low priced, but entirely satisfactory set is predecessor-Paragon R.A.-6. And the new low price the Westinghouse Aeriola Jr., at $25. This is an easily of $69.50 makes Paragon R.A. Ten a remarkable value. adjusted crystal detector set purposely designed to re- It is so simple to operate and For a complete set built around the Paragon R.A. ceive the broadcasting. additional the instructions are so clear that it is practically fool Ten receiver we recommend the following proof. The Westinghouse reputation is back of this equipment: one $65 Paragon DA -2 amplifier. cabinet, 3 batteries, one storage battery, efficient instrument which will be found unexcelled for 3 vacuum tubes, "B" Type "C" phones, a radio Magna- distances of 4o to 5o miles from a broadcasting station. one pair of Baldwin number 3 Antenna Equipment. This $25 includes head phones. The only ex- vox and our The price of which gives a set fully equal in will need are included in our Antenna equip- entire equipment, you tras you results and appearance to a high class commercial re- ment Number r at $2 complete. Thus, for $27 you can station, +s priced at $258.50 complete. get an outfit complete in every detail. You can put it ceiving up in an afternoon and listen to concerts that same In addition to the sets described above, we also recom- evening. mend complete sets built around the deForest "Every- Eastham type H -R receiver To receive distances, it is, of course, necessary man" set at $25, the Clapp longer Acmefone at $80. Descriptive literature Most vacuum tube sets at $35, and the to have vacuum tube equipment. on request. are complicated and require considerable technical knowledge. This objection is overcome in the West- If you can visit the Continental Store in New York, inghouse Aeriola Sr. This set employs the Armstrong by all means do so. Come and listen to the differ- regenerative circuit, and includes a vacuum tube detec- ent sets in actual operation. Let our salesmen, who are tor in one handsome, portable cabinet. This outfit, experienced Radio operators, help you select a set which which is far more sensitive and has considerably longer meets with your particular requirements. Aeriola Jr., comes to you complete for range than the If you live farther away, our mail order department $75. is prepared to serve you efficiently. Any of the com- For those who want a longer range, sensitive and plete sets described above will be shipped to any part highly efficient set including a loud speaker, we recom- of the United States by express, immediately. mend the following outfit : a Grebe CR -9 receiver, which and two -stage amplifier If you do not wish to order at once, let us send you includes vacuum tube detector which illus- equipment, one Radiotron detector tube, two Radio - our new folder "Music From the Clouds" tron amplifier tubes, one pair of Baldwin type "C" trates and describes in detail five complete ready -to- is free. Drop a post card phones, one Radio Magnavox, 3 "B" Batteries, and one operate outfits. It absolutely storage Battery. This set has a range of 75o to 1,000 for your copy today. CONTINENTAL RADIO AND ELECTRIC CORPORATION Dept. C -3 6 Warren Street New York City "New York's beading Wireless House"

www.americanradiohistory.com 862 Radio News for iliarch, 1922

criminals. The radio sets would be especially valuable when the machines were out in the country searching for criminals for it would permit the interchange of infor- $5.00 ARKAY mation and make captures more certain." The chief indicated his belief that use of radio in police work would be of greatest Loud Speaker benefit when applied to rural patrol work. He pointed out that with a central station in the cities, rural patrols could operate in the country in automobiles, and be instantly RADIO available in case of any trouble. "The rural districts of the state could be blocked off in districts," said the police head, "and these districts could be patrolled HORN by officers in automobiles, the same as our city streets are patrolled by policemen on Will amplify your signals, speech beats. or broad casted music without distortion. "In case of any crime in any city, when the criminals fled into the country, the pa- This horn is constructed to fit any trols could be notified by wireless so they make of receiver through the use of could lay in wait and capture the men. an adapter under the base. "Such a system would greatly decrease Works on one or two stages of am- the chances automobile bandits now have of plification. making a getaway." Furnished in black enameled finish $5.00 WOULD USE RADIOPHONES. Order through your dealer or di- E. F. Albee, head of the Keith vaudeville rect from us, remitting by money interests, has a plan to equip all the the- order the price of horns, plus parcel atres on the Keith circuit, as well as his post to your address. residence, with wireless telephones. He is Shipping weight 4 lbs. having a big electrical company furnish him with estimates on the cost and efficiency of DISTRIB UTED BY such a system. It is his idea to keep in close INDIANAPOLIS IND NEW YORK CITY touch with the managers of all the houses Hatfield Electric Co., Indianapolis, Ind. Continental Radio & Electric Corp. 6 Warren St. and, possibly, get a line on new acts, how NEWARK, NEW JERSEY Manhattan Electric Supply Co., 17 Park Place Ship Owners Radio Service, Inc., 80 Washington St. by use of the Economy Auto Supply Co., Inc., 268 Halsey St. they are received, etc., the Radio Distribut;ng Co., 4 W. Park St. PITTSBURGH, PENNA. radiophone. It is believed the Government TOLEDO, OHIO Ludwig Hommel & Co., 530 Fernando St. would fix a Keith wave length, which Marshall-Gerken Co., 27 Onterio St. Robbins Electric Co., 830 Liberty Ave. would avoid interruptions. If the plan is DEALERS -Write for Proposition. carried out it will be the first extensive commercial application of the radiophone. RILEY -KLOTZ MFG. CO. AWARD OF PRIZE FOR COVER 17 -19 MULBERRY ST. NEWARK, N. J., U S. A. IDEA. Owing to an oversight, we neglected to give credit for the clever suggestion pictured on the cover of the January issue of R.sDiJ NEWS, entitled "The Street -Organ of the Future." This was sent us by J. M. Well- FOR PROMPT SHIPMENT man, 473 Greene Avenue, Brooklyn, N. Y. who received the $io award which we offered last year for cover suggestion. WMC Variometer $5.00 w WMC Variocoupler 5.00 W Splitting the Game (Continued from page 832)

WMC Crystal Detectors 1.00 II I Switches, Contacts, etc. would seem to the writer, that particularly in the case of the coastal station operators, where the responsibility of the lives of all those aboard a ship is not in their hands (I refer to the circuit jobs -not coastal Ma- rine stations) that they be licensed and em- M M ployed as operators ; not necessarily familiar with such a variety of radio apparatus. There are men provided at all shore stations of any size, to care for the electrical end; all that operators are required to do, is to pound out the signals, and get the incoming stuff down on a good, presentable copy. At sea, it is necessarily different. An operator must be able to repair his own break- downs, and operate his installation intelli- C gently. But it would seem as if a division C of classes could made. instance, we be For could license high speed operators for shore WESTFIELD MAC -11NE CO.,WESTFIELD. < -s MASS. station circuit jobs, under one class. If necessary, create a license to radio electricians, to cover the apparatus end. Then have a grade of license that would include such knowledge of radio apparatus as was 211 RADIO MANUFACTURERS and DEALERS are now using our necessary for a man to handle apparatus aboard a vessel at its highest efficiency, to- BINDING, POSTS, SWITCH POINTS, ETC. gether with a fair telegraphing speed. The Marine man would not need to he so highly The Reason QUALITY, SERVICE, PRICE specialized a code man. Neither, on the PREMIER DENTAL MFG. CO. 60 N. 2d St., PHILA, PA. other hand, would the shore operator have CREW MACHINE PRODUCTS Get Our Literature to be an electrician. Or perhaps, the vacancies in shore stations could be filled

www.americanradiohistory.com Radio News for March, 1922 863

No. 763 Eveready Air- plane Wireless Battery. Standardized for use in U. S. Signal Corps Avia- tion Section No. 766 Eveready Wireless Station Battery Standardized for use in U. S. Navy SIGNAL FACTS about the 5 Eveready Wireless B Battery -it lasts longer Because uniformly high grade materials and refinement of manufacturing processes insure proper working of elements -its insulation is perfect Because each cell is coated with special insulating material, and then further insulated from other cells by means of specially treated waterproof cardboard separators -its operation is noiseless Because of adequate depolarization and steady voltage, perfect connections, and prevention of corrosive punctures and leaks -it maintains high voltage Because ingredients are of proper proportion, and because short circuiting is prevented -it gives five positive leads without extra cost Giving critical voltage adjustment for all types of vacuum tubes

This roo %a Eveready B Battery, linked to your receiving set, will give you more in service -more in satisfaction -than any battery you have hitherto known. See your radio equipment dealer -or write us.

NATIONAL CARBON COMPANY, Inc. Long Island City, N. Y. Atlanta Cleveland Chicago Kansas City San Francisco

FLASHLIGHTS AND BATTERIES

Note: -Every wireless operator has use for an Eveready Flashlight N1654

www.americanradiohistory.com 864 Radio News for March, 1922

from the marine posts, by requiring shore operators to have had a certain amount of sea -going experience. They would then have a fundamental knowledge of radio electricity at least, and when they attained a certain code speed in their Marine experience, they would be eligible to assignment ashore. There is room for improvement yet, and it will soon be a necessity to make some such distinction as I have outlined, I believe. Meanwhile, can we not have a few opinions on this from readers, among the old -timers?

The Plainfield Radio Association Contest (Continued from page 828) 1111,1111111111111111111111111111 IMII 11111 111IIII, I III,,, I,I,IIIIIIIIIIIIIIIIIIIIIIIIM'E WE carry complete stocks of finished new transmitting set. It will be the put into operation as soon as Mr. Scott following companies: can obtain four 5o -watt tubes to be used as oscillators and modulators. Mr. Scott's station is 2BZH. Radio Corporation At present, he is not transmitting, as his 7o-foot lattice tower was blown down in Westinghouse the wind storm a short time ago. He intends erecting a seventy -five foot steel tel- A. H. Grebe escopic mast. Another of Mr. Taylor's exhibits is an Remler Manufacturing Company entirely home -made regenerative receiver following Paragon lines but differing from E. T. Cunningham it in several respects. Another exhibit was a combination long Radio Distributing Company and short wave regenerative receiving set with home -made honey -comb coils built by W. George Booth. The engraving of the panel J. Murdock Company was considered by experienced amateurs as worthy of special note. Federal Telephone & Telegraph Co. Others showing equipment were : N. G. Haas, 3 VU, portable receiving F. A. D. Andrae set. Henry Mrynairski, 2 AQY detector and one -step Send for booklet "R" enclosing amplifier. six Gibson Buttfield, NH, detector and three - cents in stamps to cover postage. step amplifier and a special helix. The detector attracted attention because of the shortness of the leads in the amplifying circuits. C. R. Vincent, Jr., long and short wave JOBBERS AND DEALERS IN RADIO regenerative receiver, also detector and two -step amplifier. Harold Blackford, 2 QB home -made regenerative set and detector. George M. Booth, long and shorts wave PHILADELPHIA SCHOOL OF WIRELESS TELEGRAPHY regenerative set of which every part, including honeycomb, was entirely made by 1533 Pine Street Philadelphia, Pa. himself. Corwin Scott, regenerative honeycomb set. George L. Babcock, two -step amplifier, notable for the neat workmanship. E. E. Iremonger, 2 BWM, special C. W. set. DON'T MISS THIS ll , is EPBERRIES "TRANSFORMER °i t t (Audio Frequency) Walton Bostwick, detector and three - If you need an audio frequency amplifying transformer, here is an exception; stage amplifier of exceptionally opportunity. We guarantee that this new transformer is at least the equal to compact any made regardless of price. design. Also a regenerative receiver. A well known radio engineer who has just completed tests on this transformer makes the following statement: "Audibility- Identical with the and transformers which I consider the best offered for experimental use -heretofore. - Distortion -Is reduced to a mf imam. They may be placed very close together without fear of howling due to the shell core construction which greatly reduces Storage Battery for the the magnetic field loss!' It is being put on the market by a large radio manufacturer and is being in- Plate Circuit cluded in their new catalog at the regular list price which is considerably higher than ours. (Continued from page 823) THIS IS STRICTLY AN INTRODUCTORY OFFER made possible by special ar- TT rangement with the manufacturers to introduce their transformer. The supply at this price is limited. $4.50 with binding posts. Also in the strips down POSTAGE FREE THE HAYNES RADIO SHOP one side of the battery there are small holes 629 Lexington Ave., (Between 53d and 54th Sta. ) New York City bored in the connecting strip between the cells. These are fitted with brass bolts for Get a Sandy Binder for your RADIO NEWS. Holds and preserves twelve issues, each of which connecting with the switch contacts on the can be inserted or removed at will, Price 65o. Experimenter Pub. Co., Inc., Book Dept., 286-A panel. When the cells have been completed Fulton St., New York. and set in the holes and the electrodes put

www.americanradiohistory.com 865 Radio News for March, 1922

CROSLEY The New CROSLEY Variable Condenser V -T Socket -- 60c. "Better Costs Less" - "Better -- Costs Less" MODEL "C" T111; e biggest selling socket The principle of this instrument on the market. needs no introduction Thousands Practically un- of the Crosley Model "A" Con- breakable. For densers have been sold with uni- either base or form satisfaction The Model panel mount "A" is conservatively rated at ing. Made of .0005 Mf. The new Model "C" one piece por- is conservatively rated at .0012 celain. no met- Mf. al shell, hence no ground While the Model "A" was made hum. Better - with wood frame and laminated and costs only 60e wood plates the new Model "C" has ground porcelain plates with die cast frame. It is as efficient a piece of apparatus as Harko Radio Receiver you could desire. For tuning C.W. and for power transmission The most it cannot be equalled. It is tested compact and on one thousand volts before ca- complete ef- shipment. No body or hand ficient crystal pacity. Low resistance due to ab- re ce iving sence of spring contacts, copper outfit on the plates, brass binding posts, etc. and laminated Will it "sensation" of radio-- "Better- Model "A" with wood frame market We call the plates. tune from Costs Less ". wood plates and die cast 200 to 600 Model "B" with wood meters bring- Every CROSLEY VARIABLE CONDENSER frame. satisfac- same capacity ing in spark, is GUARANTEED to give absolute (Both models have the - voice and tion or money refunded. .0005.) music with CONDENSER is Model "C" as illus^. :rated- capacity .001 -por- antenna. A wonderful little instru- The CROSLEY VARIABLE cast frame, etc. amateur now made in. three styles: celaiti plates, die ment. Price complete with battery, etc., $9.00. 1.25 feet Prices as follows: One thousand ohm single head set, With knob and dial antenna wire regulators, etc., $6.00 extra. Without knob. With knob Complete outfit $15.00 and dial and dial mounted in cabinet $1.75 $2.50 Model "A" $1.25 3.00 Model 1.75 2.25 "B" 3.50 Model "C" 2.25 2.75 Harko Senior Radio Receiver Ciosley, Cabinets Crosley Detector Units We build a full line of cabinets i n g u in, m a- hogauy o r g u a r tered oak and furnish the m with genuine formica panels. Prices on cabinets Complete tuner and audion detector assembled range from on a formica or other high grade dielectric $2.50 to $10,50 panel, mounted complete in mahogany finish cabinet. Range, 150 to 600 meters, non- regen- ative hook -up. Price without battery, tube Crosley Variometer or phones $16.00

Parts Furnished completely wired and mounted as shown in illustration or in knocked down form. Price completely assembled $7.50 Price Crosley Two Step of all parts including formica or other panel of high grade dielectric composition, drilled $ ó not Amplifier Crosley Rheostats

Complete with knob, point- ers, etc., as shown in illustration. Consists of two stators, one rotor, the necessary hardware as shown in illustration. Shaft Model "A"- overall for knob and dial is 3/16" diameter. The diameter 1 Vs ". Re- wood parts are furnished either in poplar or sistance 7 ohms, one mahogany. Price of Variometer parts, using ampere without heat- poplar wood, $1.50. If wood parts are made ing. Price 60e $1.75 Complete with amplifying transformers, sockets, of mahogany rheostats, switch, binding posts, etc., mounted Model "B "- Resistance 4 on formica panel in mahogany finished cabi- ohms, 3 amperes without net. Price complete as shown in illustra- Crosley Vario- heating. Price $1.25 tion $25.00 Couplers money formica Every article guaranteed to give absolute satisfaction or Consists of you, send us his name brass refunded. If your dealer can't supply tube, rotor and and order direct. hardware. Price, com- above should be plete as shown in illus- Dealers and Distributors. Every item shown Write for proposition. . tration not wound or in your stock. assembled, $1.50. Stator O. only 40e CROSLEY MFG. CO. Radio Dept. R -7 CINCINNATI,

www.americanradiohistory.com 866 Radio News for March, 1922

in place, the battery is wired according to the diagram in Fig. 4a. In this way the cell is ready for charging. When discharged, the connections are as in Fig. 4b. The electrolyte is made by adding CP sulphuric acid Wanted For Murder ! to distilled water until a reading of 7.1 is obtained on a hydrometer in the solution. The electrolyte should stand to within half Poo71y designed phones "murder" weak sig- an inch of the top of each cell. In charg- nals. Oftentimes they cut receiving efficiency ing the battery, care should be taken to keep in half, and yet how many amateurs the current low so as to prevent the cell realize from heating. When their importance? costly receiving fully charged, a read- A equip- ing of 1275 Sp.G. shoùld be obtained. ment may detect and amplify a weak signal, The cells will require a number of charg- but whether or not that signal will be heard ings and dischargings before the plates are depends upon the 'phones used. They may fully formed. The battery, of course, is make the most of the signal or they may "mur- used as usual to discharge. With ordinary care, the battery will operate the der" it. If your 'phones are 5o% efficient, detector how for soo hours. The cell should be charged can yo -zr receiving set be l00% efficient? periodically even if its voltage is not clear down. Care Go to your dealer today and get a pair of should be taken to keep the electrolyte up in the cells. As the water Brandes on the ten -day -trial money -back- evaporates, pure distilled water should be guarantee basis. added. It is well to keep the battery cov- to protect from "Superior ", 2,000 ohms, 7v eight ered it the dust. 14 ozs, Complete with head Our booklet G will be mailed for 5 cents. Similar construction is used for batteries band and polarity indt at_ng of higher voltage. It is practical to con- cord. $8.00. It will add to your 'phone education. struct batteries of 200 volts in this way. Such a battery of loo individual cells using the corrugated electrodes described will operate a telephone set using two bulbs, one C. BRANDES, Inc. oscillator and one modulator, for 500 to 1,000 hours before the battery will need re- Room 723, 233 Lafayette Street New York City charging. As before mentioned, the battery should be recharged every so often, Member Radio Secfon Associated Manufacturers of Electrical Supplies. especially when it has been standing idle for some time.

The Newspaper of Tomorrow (Continued page Matched-Tone F. front 823) .11111111 nnmmneennnw inmnnmnnnm m 11111111111111111111nnnnnmmmmmnumuummnmnmmni li BRANDI H EADSETS microphone connected with the radiophone equipment above. For receiving the messages, Galena crystal detectors are used within a radius of 12 miles ; tube detectors within a radius of 12 to 3o miles, and tube detectors with one or NAA ON A BUZZER OR SOUNDER more amplifiers beyond 3o miles. The sending apparatus was installed by the Marconi Company at an annual rental of about $1,700. The receiving sets are also furnished by the Marconi company at an Market Reports annual charge to the subscribers of about Time Signals $66 per station. In addition, the Bourse Radio Signals, charges each subscriber about $34 per Weather regardless o f Reports annum. By placing the receiving instru- the speed they ments in prominent positions in banks and Press are sent can be brokerage houses the entire personnel of recorded o n Amateur these organizations receive the market news Stations tape and read without having to leave their desks. Clients at your leis- are also invited to the companies' offices to Commercial ure, w i t h o u t Stations hear the market reports. previous e s- The "radiophone newspaper" published by can be relayed perienee at the German Post Office near Berlin fol- to a sounder, reading t h e lows much the same general plan of the buzzer, bell or code, by the "Telephone Hirinondo" recorder at Budapest. The tape, news bulletins are furnished by a news by the agency, and there is a regular daily schedule of news dissemination. There are approximately i,000 receiving stations. Dif. forent kinds of news is radiated with dif- different wave lengths, each receiving set being permanently adjusted to receive the HALL RECORDING RELAY particular kind of news contracted for. In connection with your s arda -d -eceiving equipment operates without the necessity of amplifieee. The Government controls the entire wire- Not a magnetic or eleetries= relaw. less situation in Germany and only licensed Our new DeLure catalog it ready. and is the most comprehensive and complete manual of wireless operators are permitted to install receiving apparatus ever offered the espe¢imeater. Listing complete sets and their parts, as well as a full description of this marvelous_ rec rdir g device. Many pages of instructions and diagrams. or sending sets. Send 15e in stamps for catalog, whisk will be credited on your first order of $2.00. German experiments with a lo- kilowatt set for radiophone broadcasting have indi- Sole Diatributen The Relay cated that the efficiency of radiophone ser- of Hall Relays, Hall ITHE KARLOWA RADIO CO. the only re- vice depends much upon the stentor's qual- Distributers of cording Maim' ity of voice, enunciation, and training; STOCK ROOMS, 5TH FLOOR, BEST BLDG. that Radio Corporation ment available te men and women are about equally effective Preclude and MAIN OFFICE, 606 BEST BLD-3., ROCK ISLAND, ILL. Amateurs. as stentors ; that more satisfactory results others. I are secured at long distances than close in; and that receiving sets equipped with de-

www.americanradiohistory.com Radio News for March, 1922 867 The Most Popular Radio Insulation Week by week the amount of Formica used for radio insulation by amateur and commercial operators increases. It is the most popular material of its kind. This great demand for Formica is due to its high dielectric strength, and the low power and hysteresis losses with high frequency currents where it is employed. It is due also to the handsome, good looking panels that Formica makes and to the fact that it machines easily. It is unaffected by weather conditions, oil, water, acids, alkalies. It retains its good looks and high efficiency indefi- nitely. Formica is approved by the United States Navy and the Signal Corps! Dealers: We cooperate to increase your Formica sales. You can buy Formica in 36" x 42" sheets and cut it yourself or we will cut it into any series of standard sizes that you want at a small extra cost. Write for our dealer helps. Let us send you electrotypes for your local newspaper advertising. The Formica Insulation Company 4618 Spring Grove Avenue Winton Place Cincinnati, Ohio

Made from Anhydr:us anol Resins SHEETS TUWF'; RODS

www.americanradiohistory.com 868 Radio News for March, 1922

'i III III IIIIIIOIIIIIIIIIIIIIIIIIIINIIIIiIIIIGIIIIIIIIIIIIlIIIIIIIIIII ïl" IIIII I IIflhIIHhIIJII III II III 11h IIiüIIIIUIlIIIIjiIpIIJJ Iii i tectors alone are unsatisfactory beÿond 152 miles. A vessel en route to South America heard the station at a distance of 2,100 Everything miles. Experiments at the Nauen Station with a high frequency alternator and 130 kilowatts in the antenna also demonstrated The new branches -arcs and tubes -of the revised examination of the that speech and music could be rendered Department of Commerce are fully covered in the Home Study Course M clearly audible throughout Europe from of the Radio Institute of America. Madrid to Bucharest without the use of amplifiers. Enrollments are coming in by every mail. Why aren't you one of the wide- The latest model of receiving set used in awake wireless men who have seen the new and greater opportunity opened to M the German broadcasting service consists of an upright panel a them by the Home Study Course, which is specially designed to land above small desk to them which the receiving apparatus is attached. one of the enviable jobs at the world's greatest radio station? The instrument is tuned so as to leave but one adjustment for the operator and is then It will be equipped to work simultaneously The graduates of the Radio Institute of Amer - with five other nations in widely separated and ica enjoy a great and exclusive advantage in locked. At the top of the panel there is an distant parts of the world. the close connection existing between tke In- additional apparatus controlling a relay bell stitute and the Radio Corporation of America, which can be rung from the sending stations the world's largest radio manufacturing and A position at this station is the height of by a series of dots and dashes. This is for every operator's ambition, for it means un- commercial radio company. limited opportunity to succeed and progress to sending news extras. An electro-static ap- higker, more responsible and better paying Prominent executives in the radio field are paratus that registers telegraph code letters former students of the Institute. The Radio positions in the radio . industry. So far as on a tape at the rate of 2,000 a minute, and opportunity goes the successful future of these Corporation employs thousands of men, in its men is assured. executive departments, on ships and at shore which can be used for receiving and record stations and in factories and laboratories. A M telegraph messages sent either by wireless large percentage of these men are graduates of E- How about Yyou? the Institute. or radiophone has also been perfected. s About a year ago the British Government The Radio Institute of America has been an established and successful institution for over N experimented with the broadcasting fifteen years. It has trained over 8,000 men, 95% of whom have successfully engaged in this of new branch of science and industry. news from a station in the vicinity of Lon- don, a 12- kilowatt vacuum tube sending set Write for our booklet and further details-Now. being used. The general results were satisfactory except for the interference of ship- HOME STUDY DIVISION ping signals. It is now proposed to establish a radiophone broadcasting station at Nairobe in British East Africa to be supported by English farmers and ranchmen in that region. A io- kilowatt set will be in- Radio Institute ®f America stalled, as considerable energy is required because of the absorptive power of the (formerly Marconi Institute) U jungle regions. Although amateur wireless telegraphy 324 Broadway, New York and telephony in Europe is not conducted on nearly so extensive a scale as in tha,

II I I I l' Illlrlll United States, due largely to Government restrictions, there has been considerable ex. perimentation in types of receiving sets. One of these sets consists of a pyramidal panel surmounted by a revolving loop five RESULTS!! feet square and equipped with two detector tubes, a five -step high frequency amplifier and a three -step low frequency amplifier. DX WILL The price of this apparatus complete, including tubes, accumulator and B battery is $391. Additional tubes are furnished at RADIO Bring in that $1.6o each. Another set consists of a crystal detector with two amplifying tubes, FREQUENCY LONG DISTANCE equipped with a loop about six inches square, dry batteries being used for both filaments and plates. AMPLIFYING RADIO Vacuum tubes or radio valves are manufactured everywhere in Europe and a 500 - watt oscillator which sells in the United TRANSFORMERS CONCERT States for $175 can be purchased in Eng- land for about $36. A London concern manufactures fused quartz oscillators about one -half the size of ordinary glass tubes of about the same power. The life of the fila- ON COIL AERIAL ments of the tubes offered by this concern is All U. S. about 800 hours, but the filaments can be Amateur renewed at about 25 per cent of first cost. RECEIVING The Marconi Company manufactures oscil- RECORDS BROKEN lators up to 10 kilowatts and expects shortly with the to produce them as large as 16 kilowatts. DX -1 Radio Frequency Amplifying Transformers How soon a national radiophone "newspaper" will be attempted in the United Simple Amplifier Construction States is problematical, although many experiments of a local character along this RF Amplifier Send for Curves and Data line are being successfully conducted. When Circuit Diagrams, 25c. Bulletin No. 11 on Coil Aerials, 50c. it does come to pass, the dream of every editor in the United States will be realized, a national newspaper received and read JO everywhere throughout the country the same ],ZA -D day it is issued. No longer will the farmer or other urban dweller receive his news twenty -four hours, and sometimes days, late. He will be as quickly informed as his ThsTRUNT COMP city brother. For the radiophone will simultaneously carry the news of the world to 3NGTON. A millions of people wherever they are located.

www.americanradiohistory.com Radio News for March, 1922

t11l

11 lll(I

.1 L d. A L 4 écognized Symhol of

Do YOU Know What's NEW? SUPPOSE some friend asked you quite as good results as on a VT to compare the merits of the detector? This is being done. Am- several receiving sets designed rad Crystal Receiver and VT 2 -stage for the beginner. Would YOU Amplifier in combination can be AMRAD CRYSTAL RECEIVING SET $27..00 KNOW about the automatic wave - used with a loud speaker for local A l0eginner's SOt Do Luxe -One You Never Need Discard. Anyone Can Operate. Price includes Phones change switch, the plug -in crystal radiophone. Here is a set which and 125 ft. aerial wire- Range 15-25 miles. detector, the rear panel connections, your friend, just shaking hands with the all formica insulation, the bas- Radio, can operate. No critical ad- ketball variometer, the load coil justments. Tell him about it. Also terminals, the solid mahogany cabi- described in Bulletin F. net -all features found only in the new de luxe Amrad Crystal Receiver. Do you know all about the improved You should SEE and EXAMINE Amrad Unit System? Does your this instrument. If your dealer does friend? Does he know he can buy not stock, write for Bulletin M. the Amrad Crystal Receiver and ex- pand his equipment without losing Amrad Crystal Re- a cent -as he progresses in his AMRAD COMBINATION B -I Do you know the Range fer hullo telephone, 50 miles ceiver, with detector removed, is a knowledge of radio? haine for radio telegraph, 500 miles A see1 Crvsta! Receiver. 2575 $21.50 highly selective single circuit tuner VT Deleon only. 2771 12.50 í1111.Ah Load Coil only, 2:h62 3.85 when combined with an Amrad VT Do you know there are at least fif- (Tho above is ono of 15 Combinations) Detector also NEW? This combina- teen NEW Amrad instruments action, with Amrad Load Coil, will tually ON SALE this month? Seven bring in Arlington, 500 miles away. Individual Receiving Units, a new And where can you find a modern Wavemeter, Send -Receive Switch, VT control panel in a mahogany Electrolytic 38 mfd. Condenser, and case for only $22..50? New Bulletin Safety Devices for the antenna are F describes it. among the more important. Better send five two -cent stamps for the Do you know a VT 2 -stage Amplifier latest Amrad Catalog. It will pay can be used on a CRYSTAL with you to keep posted.

AMRAD VT 2 Stage Amplifier, 2776 $38.00 Can be added to either of above Sets to triple range and audibklity.

No. 2573 No. 2572 No. 2834 No. 2766 No. 2777 Va rio- Coupler Variometer Send -Receive Switch VT 1 -Stage Amplifier Variable Condenser $17.50 $12.00 $11.00 $19.50 $10.00 AMERICAN RADIo4D RESEARCH C9RPomiTIoN

General Office, Factory and Laboratory New York District Office Chicago District Office 21 Park Row 203 College Avenue, Medford Hillside, Mass. 600 So. Dearborn St.

www.americanradiohistory.com 870 Radio News for March, 1922

RADIO CORPORATION PRODUCTS We are distributors and jobbers for the Radio Corporation of America and always carry complete line a stock of their apparatus. We list below their complete and in addition can supply you with the Radio Corporation C.W. instruction book at 25c per copy. Item VACUUM TUBES List Prise Item KENOTRON RECTIFIERS 1 Radiotron (detector) UV- 200 $5.00 List Price 6 20 -watt Kenotron, UV -216 7.50 2 Radiotron (amplifier) UV -201 0A0 7 150 -watt Kenotron, UV -217 3 Radiotron (5 -watt) UT 202 0.00 26.50 4 Radiotron (50 -watt) IW -203 80.00 VACUUM TUBE SOCKETS 5 Radiotron (250 -watt) UV -204 110.00 8 Porcelain Socket (for UV-200, 201, 202, 216) UR -542 1.00 9 Porcelain Socket (for UV -203 and UV -217) UT-541 2.50 POWER TRANSFORMERS FOR C.W. SETS 10 Bakelite Socket (for UV -200, 201, 202, 216) UP -552 1.50 12 325-watt, 17P -1368 55.50 11 Mountings (250 -watt tube) UT-501, UT-502 2.00 13 750 -watt, UP -1016 88.58 A- Filament heating Transformer for UV-2)4, UP-1633 SPECIAL CONDENSERS FOR C.W. SETS B -Power Transformer for UV -204, UP-1636 35 Antenna Series Condenser. 7500 V..0003, .0004, 0005 mfd., LO -1015 5.40 36 Plate and Grid Condenser-3000 V. .002 mfd., 17O -1014 2.00 C.W. ACCESSORIES 37 Special Condenser- 10,000 V. 000025 mfd., UC -1803 5.00 38 Special Condenser -.002 mid., 6000 V., ITC-11306 7.00 14 Oscillation Transformer UL-1008 11.00 15 Magnetic Modulator (54 to 11/2 amp.) UT-1643 9.50 VACUUM TUBE DETECTOR ACCESSOR.ES 16 Magnetic Modulator (11 to 31/2 amp.) UT-1357 (2.00 39 Intervalve Amplifying Transformer, UV -712 7.00 17 Magnetic Modulator (31/2 to 5 amp.) UT -:.367 17.88 40 Special "A" Battery Potentiometer, PR-536 2.00 18 Filter Reactor (160 mllliamp) UP -1626 11.50 41 Tubular Grid and Plate Condenser 19 Filter Reactor (300 milliamp) UP -1627 15.75 .00025 mfd. ITC.-567 1.20 20 Plate Circuit Reactor, UP-415 5.78 .0005 UC -568 1.88 Il Filter Condenser 3S mfd. 750 V., ÚO-1831 1.65 .001 ÚC-569 1.50 92 Filter Condenser, 1 mfd. -750 V., UC -1832 1.55 .0025 1.70-570 2.00 28 Filter Condenser, 1/2 mfd. -1750 V., 17C-1034 1.60 42 Grid Leaks a4 Filter Condenser 1 mfd. -1750 V., UC -1635 2.09 UP -509, .05 megohm UP -518, 75 megohm 86 Transmitter Grid Leak (5 -watt tubes), 5000 ohms, UP -1719 1.10 UP -510, .1 UP-519, 1.0 ` I6 Transmitter Grid Leak (60 and 250 -watt tubes), 5000 ohms, UP -1518 1.88 UP -511, .15 UP -510, 1.25 " IT Antenna Ammeter, 0 -2.5 amp., UM-530 LOO UP -512, .20 UP-651, 1.6 " S8 Antenna Ammeter, 0 -5 amp., UM -533 9.25 UP -513, .25 UP-522, 1.75 " 29 Sending Key ÚQ-809 2.88 UP -514, .30 UP -523, 2.00 " 80 Microphone Transformer UP--414 7.25 UP -515, .40 UP-524, 2.50 81 Filament Rheostat (for UV -200, 201 and 202) PR- 535 6.00 UP -516, .50 " UP -525, 3.00 ' SI Filament Rheostat (for UV -203 and 204) PT-537 (0.00 UP -517, 60 UP -626, 4.00 " 83 Rotary Grid Chopper PA -1638 7.25 UP -527, 5.00 ' _ .76 ea. 84 Shaft Bushings for U" or 5/16" motor shaft .20 43 Grid Leak Mounting UX -543 .50 CUT PRICES ON OVER -STOCK OF OTHER EQUIPMENT List Prim Our Price Acme F -1 fully- mounted 1 K.W. transformer with choke coil 545.00 588.00 Acme H -1 fully- mounted 6í K.W. transformer with choke coil 20.00 22.60 Acme 500 fully- mounted 'M K.W. transformer withoit choke coil 2.00 17.60 Acme 250 unmounted U K.W. transformer without choke coil 18.00 10.00 Sloane 1 K.W. keys with 'k inch silver contacts 4.00 2.75 Tuska C.W. inductance Type 181A 5.00 4.00 L -104 Regenerative receiving transformer (loose -coupler) 29.50 20.65 L -103 Regenerative receiving transformer (loose- coupler) 25.50 16.45 L -102 "tatandard" recelvtng transformer (loose -coupler) 19.50 13.65 121 Single capacity fired phone condenser .005 kLF 1.50 .80 122 Double capacity fixed phone condenser .005 5L 1.80 1.00 123 Double capacity fixed phone condenser .005 SLF. with switch 2.50 1.40 De Forest CV -500 condensers -ideal for C.W. work; .0005 MF 5.25 4.50 No. 115 Crystal detector complete with galena and cats- whisker 1.60 1.00 No. 117 Crystal - detester complete with galena or silicon 2.15 1.50 No. 110 Crystal detector complete with galena or silicon 2.10 1.45 Send 15c for our complete literature ELECTRICAL SPECIALTY COMPANY, 48 -50 South Front Street COLUMBUS, OHIO PARAGON TRADE MARK REGISTERED the PIONEER 1915 First regenerative receiver ever manufactured bore the name PARAGON. 1916 First Trans -continental Amateur Reception (California from New York; not pre-arranged) effected with a PARAGON Type RA -6 Receiver. 1916 First Trans -continental, Amateur Transmission (New York to California; not pre- arranged) effected by PARAGON designed transmitter. 1917 -1918 PARAGON acknowledged supreme on Western Front. 1921 First Trans -Atlantic Amateur reception effected with PARAGON receiving equipment, at which time 27 different amateurs scattered thruout the Eastern section of the United States registered signals at Ardrossen, Scotland-3500 miles. THERE'S A REASON! 2nd District Convention-Hotel Pennsylvania -New York, March 7th to 11th, 1922. The ADAMS - MOKGAN CO. Manufacturers UPPER MONTCLAIR, N. J., U. S. A.

www.americanradiohistory.com Radio News for March, 1922 871

Tubes and Transformers In Cascade

E (Continued from page 811) ri11111,,,,1.111111111...... ,,,..,,,. curs either a minimum of sound or silence in the receivers. At this point, the two phases of the AC are equal and opposite, differing by 180 degrees. The ratio of the resistance in the grid side to that in the plate side, will give the nearly approximate amplification factor of the given tube. This test presents the factor in a more accurate manner because it more nearly represents the action of the tube under actual operat- Variations of the grid volt- One ing conditions. age will yield slightly different results, but give the amplification factor CWAPPARATUS an average will close enough for the practical work of the average experimenter. For the computation of the internal resistance of the tube, refer to Fig. 3, where During all the time Acme has the dynamic value of the internal plate resistance is measured by the utilization of built C. W. apparatus, less than the apparatus represented. In the plate circus+ ;s inserted the ordinary out of every thou- plate battery at a fixed value of EMF. The one instrument secondary of the transformer receives current from an A.C. source connected in se- sand has come back for replace- ries with the primary. In shunt to the secondary is connected the large variable re- ment, or even repairs. sistance RI -R2 to which is connected the slider, with a lead to the phones and thence to the filament. The resistance R is of Take the uncertainty out of C. known value, as well as that of RI -R2. This is the ordinary bridge method, and when the W. by using Acme apparatus slider is placed at a certain point where the sound in the phones is at a minimum, or silence occurs, the insertion of the resist- thruout. ance values in the following rule will yield the approximate internal resistance of the Acme was the first to pre- ment is the fruit of exhaust- tube: pare for C. W. Years ago ive research and all are de- R -p equals RI divided by R2 and multiplied by R. we began to develop an signed with careful reference In connection with the plate resistance Acme instrument to .antici- to the others. Before you measurement, a word regarding the applica- pate every C. W. need. To- start your C. W. outfit, get Let us tion of transformers in amplifying day Acme has the most com- the Acme bulletins. And repeat a former statement, which is that the same current would flow in the plate circuit plete line of C. W. apparatus when you do build, use Acme if the latter were connected to an alternator in existence. Each instru- apparatus throughout! of the EMF of the product of the amplification factor and the grid voltage and possess- ing the same internal resistance as the tube (plate to filament). APPARATUS CO. It remains that the maximum of power ACME will exist in the plate circuit when the re- 188 MASSACHUSETTS AVENUE is equal to that of the sistance of the latter CAMBRIDGE, MASS. internal plate to filament resistance. If we consider that the impedance and the resistance of the plate circuit is all resistance there arc several ways in which to suit the particular tube to the individual plate circuit, or of fitting the particular plate circui' to a particular tube, over a certain range As the internal resistance of the plate -filament depends upon the tension of the plate STORAGE BATTERIES, battery, the temperature of the filament, and Designed Especially For PGO the voltage of the grid, there are offered at P °pa

least three ways in which a tube may be estro ELECTRIC CO used to greatest advantage in a certain cir WIRELESS cuit, or a certain circuit's constants may be 1KICO °B" batteries give years of service. Are not KICO "A" batteries. No more acid Owen rugs e harmed from short-circuiting, overcharging or stand- furniture. Truly a parlor battery. Sox and liars altered to fit the particular tube. ing idle. One charge lasts from three to six moulded in one piece from acid proof composition months while in the detector plate circuit. Can be many times tougher than hard rubber. Guaranteed The voltage of the "B" Battery may be recharged from your A. C. line in one hour. Panel 18 months on Ford, Chevrolet or any car tarn/ changed, thereby changing the internal re- refunded if unsatisfied after ninety day trial. Prizes battery 9% x 7% inches, but will last several sears as follows. as wireless "A" battery. Shipped ready for use sistance of the tube, or the grid EMF may (With Panels) .(Plain With Cline) with hydrometer for testing at $24.00 or with wooden be changed, or the external plate circuit re- 32 volts $11.00 $8.00 box and rubber jars. 6 volt, $20.50; 8 volt, $27.00; 48 volts 13.00 10.00 10 volt, $33.00. All 80 to 100 A.H. sistance may be altered to suit the particu- 68 volts 16.00 12.00 Write for particulars lar and desired result in the functioning apparatus. KIMLEY ELECTRIC CO., 290 Winslow Avenue, BUFFALO, N. Y. It is evident that in the selection of a

tube for use with a particular transformer . Insure your copy reaching you each month. Subscribe to Radio News -$2.5o in order to get the maximum of results, the a year. Experimenter Publishing Co., 236 -A Fulton St., N. Y. C. internal resistance of the tube should be

www.americanradiohistory.com 872 Radio News for March, 1922

found by actual test. In the presence of manufactured read -to -use apparatus, such as a particular transformer of a certain type this test of the tube must be made if the best functioning of the apparatus is desired MARKO because to resort to the change in the construction of dimensions of the transformer THE STORAGE BATTERY FOR WIRELESS WORK might incur tedious and extraneous labor, which the experimenter might shun as uncalled for and wasteful, in all prob- ability depreciating the value of the transformer under the value of the purchase price. On the other hand, if the characteristics of the tube are considered, in order to harmonize with the constants of the transformer, the change of the tube constants by the ways suggested heretofore might bring the working capacity of the tube to a stage where the results desired would be conspicuous by their absence, whereas another tube of other manufacture might exactly suit the requirements. As the tube itself could not be altered in in- terior construction, with a great lot of labor, it remains that the proper tube be selected in the first place to be utilized with the avail- The MARKO Radio Battery is especially designed for radio able transformer. work. You are assured of the highest capacity and a constant Measurement of the ohmic resistance of voltage. It has been used for over ten years by the most discrimin- the primary of the transformer may be made with the ordinary bridge method. ating wireless engineers. When the internal resistance of the tube is comparable with the external plate circuit 6W2 6 20 Amp. Hrs. $10.20 resistance, through the transformer primary volt the leads, 6W4 6 volt 4o Amp. Hrs. 13.70 etc., the secondary of the transformer must be regarded with care. Al- 6W6 6 volt 6o Amp. Hrs. 17.50 though the average experimenter may not 6W8 6 volt 8o Amp. Hrs. 22.00 care to carry the test to such an extreme as 6Wio 6 volt loo Amp. Hrs. 27.00 calculating the infinitely exact maximum possible voltage delivered by the secondary of the transformer to the grid of the next MARKO STORAGE BATTERY COMPANY tube, nevertheless the secondary must be designed for this maximum delivery of 1402 Atlantic Avenue maximum potential to the grid of the suc- Brooklyn, New York ceeding tube in the cascade. By calculation of the constants of the secondary of the transformer, it can be ap- proximated as to the potential delivered to the grid of the next tube, if the constants of the other plate- transformer primary cir- The Benwood Motor Generator cuit has been found by test. MADE FOR RADIOPHONE AND CW WORK In this connection, it may be well to re- 600 volts 200 watts mind the reader of the load current of the Has 84 segments in commu- transformer, which, although of not large tator, an exclusive feature. actual value these cuts the familiar "hum" down it transformers, never to absolute minimum. theless has considerable effect upon the operation of the amplifier. SPECIFICATIONS As the primary in- MOTOR. % hp. Runs at duces a current in the secondary, i8o time - 1750 RPM, 110 volts, 60 cycle. degrees behind the inducing current, there is Exceptionally easy running, in- a reaction upon the primary current due duction type. Motors for all to other standard voltages and the re- induced electromotive force in the frequencies in stock either primary of the transformer and this result- AC or DC. ant current opposes the primary current GENERATOR. A great (original), representing deal of thought and effort has thus the load upon been given to this piece of the primary circuit, which is a part of the apparatus and it is the finest plate circuit of the other tube. This Load that has ever been manufac- effects the maximum power delivery of the tured for radiophone or continuous wave work. There are 84 segments in the commutator plate circuit, (exclusive feature). The generator is very conservatively rated at 200 watts. It will easily and it may be of such value at stand a 300 watt load with no appreciable heating. The machine under actual load gave the to considerably deviate the power in the following results, which are quite remarkable, plate circuit from the value which repre- Running cold, No load 610 volts sents the imposition of maximum tension Under 50 watt load. 580 volts upon Under 100 watt load 550 volts the plates of the succeeding grid con- Under 150 watt load 530 volts denser. This fact occurs in certain types Under 200 watt load 520 volts of transformers which are utilized in am- Under 250 watt load 510 volts plification circuits of this type. Under 300 watt load 500 volts This complete outfit is fully gucranteed for a two year period against all electrical and me- The actual tests of the transformers may chanical defects. It is of the highest grade workmanship throughout and only the very best be calculated by the measurement in watts materials are used in its construction. We specialize on this one size only, thus we are enabled of the input and the output, and if the re- to quote the attractive price of $95.00 conplete, sult of the output is divided by that of the The motor or generator can be purchased separately. input and result Generator only, $55.00. Motor only, $35.00 that multiplied by too, the last result will be in per cent. While we cannot guarantee the generator against electrical breakdown, many stations are efficiency. driving the machine at 3400 rpm. to obtain 1100 volts for the 50 watt tubes. In the selection of a proper tube for use Send ten cents in stamps for the NEW BENWOOD RADIO CATALOG. Lists all that is with the choke coil coupling, it must be kept new in radio telephones and shows all the latest BENWOOD APPARATUS, in mind that one of the advantages of this Includes our new price dictionary on all radio apparatus. type is the possible reduction of the exter- TRY OUR MAIL ORDER SERVICE nal plate resistance to a medium low value We are the Western Distributors for the new MII -RAD (ohmic) and the resultant possible employ radio frequency transformer. Sells at $9.00 each. Write for special bulletin on this transformer. nient of a lower tension `B" battery. The power loss is, therefore, small. By the application of a condenser in shunt to the THE BEN WOOD CO., Inc., ST. LOU SE MO. choke, the reaction of the circuit may be made maximum, and the resultant voltage

www.americanradiohistory.com Radio News for March, 1922. 873

1BCG-GREEN WICH FIRST TO GET ACROSS Mr. Cronkhite Put It Over With This Set Read remarkable power of this out('t on page 25 Jan'y "Wireless Age" and page 29, Feb. "Q S T"

2 UNIT 4 BEARING 1500 WATT 2FD- FLUSHING Get Across With Similar Set 1IRU- HARTFORD Also-But With a 250 Watt Set

1 BKA - OLENBROOK Put It Over With This

3 UNIT 500 WATT OUTFIT

911K- CLINTON Iowa, Goes Coast to Coast with this Little Set

2 BEARING 100 WATT

THESE (and other) INSTITUTIONS USE OUR MOTOR -GENERATORS MASS. INSTITUTE OF TECHNOLOGY PRINCETON UNIVERSITY QUEENS UNIVERSITY- CANADA FORDHAM UNIVERSITY COLLEGE ST. CROIX- CANADA UNIVERSITY OF SO. DAKOTA UNIVERSITY OF MISSOURI RICE INSTITUTE -TEXAS UNIVERSITY OF IOWA UNIVERSITY OF FLORIDA BILLINGS POLYTECHNIC -MONTANA DENVER SCHOOL OF MINES PHILADELPHIA SCHOOL OR W. T. HAMMOND RADIO RESEARCH LAB. NORTHWESTERN SCHOOL OF W. T. ASBURY PARK RADIO SCHOOL CLARK UNIVERSITY, WORCESTER LaFAYETTE COLLEGE, EASTON Write for Bulletin 237 ELECTRIC SPECIALTY CO. MOTORS -DYNAMOTORS -GENERATORS -MOTOR GENERATORS 211 SOUTH STREET TRADE MARK "ESCO// STAMFORD, CONN., U. S. A. PIONEERS IN DEVELOPING HIGH VOLTAGE D. C. GENERATORS

www.americanradiohistory.com 874 Radio News for March, 1922

amplification be made maximum. In this connection, it may be kept in mind that the characteristic of vacuum tubes in- Mos$ dicates that the latter will function best Efficient Battery Nude. when the amplitude of the charge on the grid is at a maximum, operating at a better stage Radio Operators. -You owe it to yourself to try out the National than when the impressed grid voltage "B" Battery. It is the most efficient Radio battery matte. If your is at a lower voltage, due to the fact that dealer does not handle them yet, send in your order to us. enclosing the voltage amplification from the preced- check for amount, and we will send you the most satisfactory battery you have ever used. ing tube is smaller than possible or ordinary cn account of the improper selection of constants in the external plate circuit of that tube. If the constants of this latter circuit are not calculated by actual test, or by the knowledge of the manufacturer's tests, the resultant efficiency and the desired at l 13"13aftegLA5T5 LONGER results will not approach the maximum pos- SERVES BETTER- CO5T5 LE55 sible in the particular cascade. For amplifying tubes. detector and plate circuit The National "B" Battery gives more hours of The actual measurement of the total im- service, is moisture proof, silent and free from leaks. pedance of an alternating current circuit A NATIONAL, ALWAYS A NATIONAL" may be calculated in much the same manner "ONCE as that of a D.C. circuit, and with the No. Typo Size Voltage Hrs. Service Taps \Ct List Price 517 Plain 21/2x2x3% 400 1 lb. $1.50 proper instruments) the impedance of the 518 Variable 2%x2x3% 221 400 5 1 lb. 1.75 external plate circuit may be calculated from 519 Plain 3 x4x6% 221 1400 5 1hs. 2.5C 520 Variable 3 x4x6% 22Y 1400 5 5 lbs. 3.0C the following formula or rule, where I is 521 Plain 3 xSxO% 45 3000 10 lbs. 5.0C the in 6.00 current decimal fractions of an am- 522 Variable 3 xSx6% 45 3000 6 10 lbs. pere, the voltage V, and the total impedance line of Novelties and Flashlight Batteries Q, that is, Q equals E divided by I. Also a complete In regard to the calculation of the safe current carrying capacity, the following may National Electric Novelty Co well be utilized for comparison, by the ex- 53 Walker 5t New York perimenter': A filament .005" in diameter will safely emit .03 ampere per centimeter of length DEALERS 3...T.,_ NO AMP - The filament heating current represents 3.7 write for special JJ)i' f `I watts per centimeter of length. A filament C-tl' wI?C-*C, .or" in diameter may safely emit Jo am- offer and 11 ätioiíf! (t; jEalÿa pere per c.m. of length, while the filament Zr>STS discount SON6ew-,F... 'cfr t.>=. 7.2 *a1oT«t.ra,.nel..r.aR.e.T,.N óe,efeBotrery current represents watts per c.m. it .> mere twn.f semmag.i. ...Om< r. r.,t..t...añw length. l //y lion ccl lw ÿt qrK. vá eo cepa" In summary it is made readily obvious that if the average experimenter carefully selects the tube of the desired (or as near

as can possibly be obtained) characteristics . and with the same forethought, chooses the constants for the circuits of the cascade COMBINATION OFFERS amplifier, the result will be most successful SPECIAL PARADO OFFER No. 2 AGENTS and most gratifying. We list below the apparatus to make a 2 -step am- DEALERS and plifier complete. This equipment can be added to the apparatus described in Parado Offer No. 12, We are making special offers to our January Radio News. PLACE YOUR ORDERS NOW. dealers and agents to represent us 2 -Step Amplifier Complete all over the country. We are dis- What Anyone Can Hear 2 T5 Thordarson Amplifying transformers.... 8.00 tributors of the best equipment. Get (Continued front page 814) _ 2 UV-201 Radiotron or Moorhead AF ampli- lines appara- fier tubes 13.00 our prices on these of ..e. .11ll .,..1111,111111a....a.ee..,11a111111 .l..ea..11111111,.1 .,eeee,....ee,,,,l,,.,.,..,..l,l 11111.,,,l.` 2 1423 -W Federal jacks 2.00 tus: 2 R500 DeForest sockets 2.00 2 P500 DeForest rheostats 2.20 1 -45 volt Ace B Battery 3.50 Acme Clapp -Eastham Grebe thus keep the line of communication open. 4 Nickel plated binding posts .36 One boy, or young man, or girl in any 1 Panel 6 x 10 x % inches .90 Adams -Morgan DeForest Moorhead 20 feet connecting wire .15 community, with an efficient radio re- $32.11 Baldwin Jewell Murdock ceiver, could maintain this contact with CUR SPECIAL PARADO COMBINATION PRICE Washington. In time of danger a contin- $28.80 Brandes Federal Pacent uous watch could be maintained -an easy Complete instructions for assembly and connections matter if the system is once established included free of charge. Westinghouse Radio Corporation RADIO CITIZENS. -Get on our mailing list. locally. The Boy Scouts of America are Write for copy of Bulletin P -13. Order your ap- Write today to especially encouraged to serve as operators paratus today for early shipment and messengers in this system. KLAUS In times of danger, speed is necessary. Peoria Radio Wire service is fast, but radio is instan- Sales Co. RADIO taneous. One Government official in CO. Washington could give a word of warning Dept. B to every American community at the same PEORIA, Dept. 200 moment if every community were listening. to a means of se- Illinois Sometimes, provide _,T crecy, these messages are transmitted in __ Navy Amateur Code. Key to the codes FIRST TESTED - -THEN used will he sent free on request by the SOLD Seascout Radio Commodore, 200 Fifth Avenue, New York City. BROADCASTS FROM GOVERNMENT STATIONS (International Morse Code) "A" 6 Volt Storage Battery with Cunningham Tube C 300 by Amps. Battery only With C 300 Tube Weather reports are transmitted 60 $12.65 $17.15 Naval Radio Stations as follows: 80 13.95 18.45 100 17.50 22.00 Atlantic Coast. 120 19 95 24.45 Sent by express collect. Tube only prepaid $5.00. Washington, call letters NAA, 265o If Tube C301 is wanted in place of C300, add $1.50 Satisfactloi guaranteed or money back. meters. Io P. M. (Eastern Stand- Send for cur catalog of Radio Supplies. ard Time). Time signals start at 9.55 and stop at Io P. M. Key West, Florida, call letters NAR,

www.americanradiohistory.com Radio News for March, 1922 875 SOMETHING NEW IN RADIO MAKE YOUR OWN Send for Pattern Pattern No. 1 No. 2 Complete Short ``y Wave Regenerative Just Out tia. Set 40, W and for 2 50c. _ , Pattern No. Both Together: Per Set $1.00 DETECTO¢t;,. Prepaid Prepaid AMPtIFIÉR7Ì11ITS built the short wave regenerative set of This does away with all fussing and this series of patterns, can appreciate the calculating as we have done all the laying shop, and you need The second set of patterns that we are simplicity and ease of construction of out in our own offering now to the amateurs and radio these new instruments. not worry that the final instrument does experimenters, was designed so as to If, to the short wave set, which may not come out right match the short -wave regenerative set be built with the set of patterns No. I, BEFORE SELLING YOU THIS which may be built with patterns No. I are added a detector and two amplifying PATTERN WE HAVE GONE TO designed especially for its construction. units, the receiving outfit thus composed THE TROUBLE OF ACTUALLY The panel of each unit is of the same will give wonderful results and will en- BUILDING THE OUTFIT AND WE height, and the disposition of the bind- able the owner to operate a loud talker KNOW THAT IT IS ABSOLUTELY ing posts makes it possible to use the for the entertainment of his friends with RIGHT IN ALL PARTICULARS. detector control cabinet alone, or with radiophone transmissions, which may now any number of amplifier units, with only be received every day. The appearance The original may be inspected at any one "A" and one "B" battery, if so de- of the complete receiving outfit, which time. Only standard parts are used in sired. The arrangement of the binding may be built with these sets of patterns, making the outfit. posts was made with a view to :avoiding is as attractive as that of any standard Complete and very explicit directions any long wiring from the batteries to the make of apparatus, and its functioning is go with the pattern which is furnished filaments of the tube used in each unit, as good and we may say, in several cases. in a heavy envelope g x I2 ". and each of these control cabinets, being better. fitted with a jack, the telephones may be Patterns are printed on heavy blue- plugged in for the detector alone or any print paper exactly the size of the panels Complete pattern for detector and number of stages of amplification con- to be used. amplifier units consisting of two nected to it. The position of the holes and other full size blue -prints and four pages The detector and amplifier units, which markations are exact, so that all you 9x12 instruction pamphlet in heavy may be built from this set of patterns. have to do is to paste the pattern on top envelope, per set prepaid, may be used with any type of regenera- of your bakelite panel by means of ordi- tive receiver, or long wave set, using nary library paste, and when dry drill honeycomb coils or any other form of right through the pattern wherever the 50c inductance for tuning. Only those who marks are located. Either Direct from us or for sale by theifollowing responsible Dealers: Schmidt & Co., R. Rochester, N. Y. Alamo Sales Corp.. Indianapolis, Ind. Fergus Elec. Co. Zanesville, O. New England Motor Sales Co., Green- Am. Electro Tech. App. Co., N. Y. City Findley Electric Co. Minneapolis, Minn. wich, Conn. Sears, Roebuck & Co. Chicago, Ill. Conn. Fleron & M. M. Trenton, N. J. New Era Shop Milwaukee, Wis. Service Radio School, Washington, D. C. American Hdw. Stores, Bridgeport, Son, O. & Sons, Milwaukee, Wis. Fuller Co., Seth W Boston, Mass. Newman-Stern Co. Cleveland, Shotton Radio Mfg. Co. Scranton, Pa. Andrea Julius, Blg. Green, KY. Andrea & Sons, Julius Mason City, Ia. Galveston W'less Sup. CO., Galveston, Tea. Nichols Radio Sup. Co., Smith Radio Lab. Sarnia, Ont., Canada London, Canada Nola Radio Co. New Orleans, La. Anthracite Radio Shop Scranton, Pa. Gurd & Co., Wm. Smith Novatos' Elec. Ina, Charlotte, N. C. Atlantic Radio Co. Boston, Mass. Hall Electric Co., Wm. Dayton, O. Noll & Co., E. P. Philadelphia, Pa. Bamberger & Co., L. Newark, N. J. Hatfield Electric Co. Indianapolis, Ind. Northern Radio & El. Co., Seattle, Wash. So. California Elec. Co., Los Angeles, Cal. Banister & Pollard Co., Newark, N. J. IIeustis, A. E. Fitchburg, Mass. Northwest Radio Fiery. Co., Seattle, Wash. Southern Elec'1. Sup. Co. San Diego, Cal. Bellwood Specialty Co. St. Louis, Mo. Hickson Electric Co. Rochester 18. Y. N. S. W. Bcokstall Co. Sydney, Australia Southwest Radio Sup. Co. Dallas, Tex. New York City Blueburd Electric Shop Newark, N. J. Hiro Wireless Sup. Co. Marion, Ill. Pacent Electric Co. Sprott C. Fla. Paramount Radio Sup. Ch., Atlantic City -Shaw Schl. Vancouver, B. Brode Electric Co. Los Angeles, Cal. Holt Electric Util. Co., Jacksonville, Sterling Electric Co., Minneapolis, Minn. Brown, J. Edw. Glenbrook, Conn. Hughes Elec'l. Corp. Syracuse, N. Y. Paul's Electric Stores Medford, Ore. Bullock's York, Neb. Jenkins, Lester I. New Bedford, Mass. Pearlman's Book Shop, Washington, D. C. Stubbs Electric Co. Portland, Ore. Bunnell & Co., T. H. New York City Karlowa Radio Corp. Rock Island, Ill. Penn Radio Apparatus Co., Reading, Pa. T. & H. Radio Co. Anthony, Kans. Durham & Co., Deptford, S. E. 8, England Ratxenloach & Co., F. S., Trenton, N. J. Penn. Marconi Wireless Sell. Phila. Tuska Co., C. S. Hartford, Conn. California Eler. Co., San Francisco, Cal. Kendall Co., W. D. Worcester, Mass. Phila Sch1 of Wireless Tele. Phila., Pa. United Elec. Stores Cc, Braddock, Pa Electric Atlanta, Ga. Iíeubler Radio Co. Toledo, O. Piedmont Electric C'o. Asheville, N. C. Carter Co. Minn. United Electric Stores E. Pittsburg, Pa. Cation, Neill & Co. Honolulu, T. H. Killoch Co., David New York City Pioneer Electric Co. St. Paul, U. S. Radio Co. Pittsburg, Pa. Pittsburgh, Pa. Pitts Co., F. D. Boston, Mass. Central Radio Co., Independence, Mo. King Radio Co. Pa. Warner Bros. Oakland, Cal. Central Radio Co., Ransas City, Mo. Klaus Radio Co. Eureka. Ill. Pitts. Radio Sup. Co. Pittsburgh, Western Radio C. Ransas City, Mo. Chase, H. Newport, R. I. Kluge. Arno A. Los Angeles, C'al. Pitts. Radio & App. Co., Pittsburgh, Pa. Geo. Arthur, Tea. West'n Radio Elea Co., Los Angeles, Cal. Chicago Radio Ap. Co. Chicago, ID. Krause & Co., A. F. Detroit. Mich. Port Arthur Rad. Lab., Port Wheeler Green Electric Co., Rochester. Cleveland Co., L, W. Portland, Me. Kusel Co.. D. & F. Watertown, Wis. Post Office News Co. Chicago, Ill. O. N. Y. Cloud & Son Macy, Ind. Lehigh Radio Co. Bethlehem. Pa. Precision Equipment Co. Cincinnati, Mass. Whitall Electric Co. Westerly, R. I. taon. Radio & Elec. Corp. N. Y. City Liberty Incandescent Sup. Co., Pittsburgh, Radio Development Co., Springfield, Co.. The Columbus, Radio Co. Newark, N. J. White Ga. Cutting & Washington New York C'ty Pa. Distributing White & Boyer Co. Washington, D. C. Daily Battery & Equipment Co., Pitts- Liberty Radio Sup. Co. Chicago, Ill. Radio Electric Co. Pittsburgh, Pa. nl. Equipment Co. Boston, Mass. White & Bro., Frank Canton, burg. Pa. Lingo Elee'1 Sup. Co. St. Louis, Mo. Radio Williamson Elec. Co. Seattle, Wash. Delancey -Felch & Co. Pawtucket, R. I. Ludwig Hommel & Co. Pittsburg, Pa. Radio Equipt. & Mfg. Co., Minneapolis Cleveland, O. Wilmington Elec. Spec. Co., Wilmington Detroit Electric Co. Detroit, Mich. Luther. H. E. Centerville, Ia. Radioelectric Shop Wilson Co., Harold K., Grundy Center, Dewey Sptg. Goods Co. Mi',e kee, Wis. McCarthy Bros. & Ford, Buffalo, N. Y. Ray -Di 'C'h. Chicago, Ill. Radio Denver, Colo. Iowa. Doubleday -Hill Elea Co. Pittsburgh, Pa McMillan Bros. Pittsburg, Pa. Reynolds Co, Aurora, Colo. Y. & CHe. Reuter Electric Co. Cincinnati, O. Winner Radio Drevtuss Sales Co. New York City Manhattan Elec. Sup. Co., N. Wireless bffg. Co. Canton, O. Duck & Co., Wm. B. Toledo, O. Marshall- Gerken Co. Toledo, O. R. I. Elea. Equipt. Co. Providence, R.I. NMilwaukee. Wireless Press New York City Dunn, J. J. Pasadena, Cal. I Meter Eleé l Const. Co.. Oshkosh, Wis. Riverside Laboratory Neb. Cal. Rose Radio Supply kees, Ls. Wolfe Electric Co. Omaha, Electric Motor & Eng. Co. Canton, O. bfeyberg Co., Leo 3., San Francisco, Y. M. C. A. Los Angeles, Cal. Electro Importing Co. N. Y. City Mohawk Pilori. Sup. 'Co., Ss-raceme, N. Y. Roy News CO., Fre'k J. Toronto, Can. Ga. Sands Electric Co. Wheeling, W. Va. Zamoiski Co., Jas. M., Baltimore, Md. Elite Electric Shop El Paso, Tea. National Radio corp. Atlanta, Ziban Bros. Nashville, Tenn. Erie Book Store Erie, Pa. Nat'l Radio Institute, Washington, D. C. Sayre -Level Radio C'o. Phila., Pa. Consolidated Radio Call Book Co., Inc., 98 Park Place, New York City

www.americanradiohistory.com Radio News for March, 1922

5500 meters. Same time. Great Lakes. Great Lakes, call letters NAJ, 1512 "ILLINOIS" THE RELIABLE meters. Io P. M. (Central Standard Time). Time signals 9.55 to Io P. M. MADE RIGHT - STAYS RIGHT Pacific Coast. San Francisco, call letters NPH, 95z Three Styles: No z. meters. Noon and io P. M. Preceded by Panel; No. z, Open Type time signals on 2400 and 4800 meters as shown; No. 3, Fully from 9.55 to Io P. M. Encased. Anti Profiteer. North Head, call letters NPE, 952 Less than pre -war prices. meters. Same schedule. Fully assembled and tested. San Diego, call letters NPL, 952 meters. Same schedule. Style No. I No. 2 No. 3 67 Plates, $7.00 $8.00 $8.5o Local weather reports are broadcasted by Tatoosh, North Head, San Fran- 43 " 3.50 4.50 4.75 cisco 23 2.75 3.75 4.00 and San Diego at 8 A. M. and if" 2.25 3.25 3.50 4 P. M. on 600 meters and at noon and Io P. M. on 952 meters. Also by Money back if not satis- Puget Sound, Marshfield and Point fied. Just return condenser Arguella at noon and io P. M. on 600 within ro days by insured meters. Total weather report from Parcel Post. Farallone Islands is forwarded to San STYLE No. I STYLE No. S Options : - With Style Francisco for Marine Exchange at 8 No. i-instead of Scale A. M., noon, and 5 P. M. and Pointer, a 3 -inch Metal Dial at 5o cents extra, or a 3 -inch Bakelite Dial at $r.00 extra. Large Knobs. There are Navy radio stations in or near Both excellent values. Or we will, if desired, supply most of the coast cities of the United the Condenser with smooth 3 -56 inch center staff, with- States and its islands. Many of these out Scale, Knob and Pointer, at 15 cents off the list transmit press. Details are not given to those who prefer to supply their own dial. in the pamphlet on Commercial and Vernier with single movable plate applied to 13, 23 Government Radio Stations of the or 43 plate condenser, $3.00 extra. United States, but they are usually known to local amateurs. We allow no discounts except 5 percent on orders of 6 or more. An example of the broadcast schedules Sent Prepaid on Receipt of Price of Navy stations is given in the fol- Except: Pacific States, Alaska, Hawaii, Philippines lowing official statement: and Canal Zone, add roc. Canada add 25c. "All Broadcast Schedules of the Third Foreign. Orders other than Canada not solicited. Naval District are transmitted by the VERNIER U. S. Naval Radio Station, Navy G.F. JOHNSON, 625 Black Ave., Springfield, Illinois. Yard, New York, on 1832 meter wave- length as follows : Ten thirty A. M. and five P. M. Weather and Hydro - graphic information; Nine P. M. and three A. M. press; Nine thirty P. M. IT TAKES AWIZARD TO DO THE WORK Amateur Radio Broadcast." RADIO MARKET NEWS SERVICE All Wizard `B' Batteries are The Bureau of Markets and Crop Esti- mates of the United States Department of Absolutely Guaranteed Agriculture, in cooperation with the Air Mail Radio Service of the Post Office De Equally good for Wireless Music or Codes. partment, broadcasts market news by radio Buy direct from manufacturer and receive daily except Sundays and holidays, in ac- fresh Batteries. cordance with the following schedule: Be- tween June 15 and September 15 no radio Announcing Wizard's 2 New Improved Type "B" Batteries reports will be broadcasted on Saturdays No. 1632 -1 tap 45 Volt Var. Battery, Size 6x5x2% In. (Wt. 3% lbs.) Price $2.80 after I P. M. Notice of any changes in No. 1630 -6 tap 27 Volt Var. Battery, Size 6x3x2% in. (Wt. 2% lbs.) Price $1.80 this schedule will be broadcasted in connection with the radio reports for one or These new types are not made of the same size cells as a small size "B" Battery. The volume of one the more days prior to the date such changes of cells in these types is become effective. 4.7 cu. inches as compared with 2.5 cu. inches, the volume of a cell used in small "B's ". You can easily see that the life of these Washington, D. C. Call letters WWX. two types are almost double the life of the small "B's." Weather to A. M. Grain and live stock, 7.30 to 8 P. M. Fruit and vegetables, 8 OTHER WIZARD TYPES to 8.3o P. M. Eastern time. i8o0 meters. Cat. No. Size Taps Voltage Weight Price 1623 Plain 2 % x2x3% 22%s 1 lb. $1.00 Cincinnati, Ohio. Call letters KDQC. Live 1623 Variable 21/2x2x3% 5 221,2 S lb. 1.20 1625 Plain 3 x4xS% 22ls 5 lbs. 1.85 stock receipts g to 9.15 A. M. Chicago 1625 Variable 3x4x6% 5 22% 5 lbs. 2.25 live stock II to 11.30 A. M. St. Louis 1626 Plain 3xSx6% 45 10 lbs. 3.75 1626 Variable 3x8x6% 6 45 10 lbs. 4.15 live stock 12 to 12.30 P. M. Chicago live stock 7.30 to 7.45 P. M. St. Louis live FOR No. 6. WRITE BULLETIN stock 8 to 8.15 P. M. Central time. 400o meters. Dept. R, ldStreet Omaha, Neb. Call letters KDEF. Live WIZARD BATTERY CO. 1315 4 stock receipts 9 to 9.15 A. M. Chicago live stock II to 11.30 A. M. Omaha live stock 12 to 12.30 P. M. Kansas City live stock I to 1.30 P. M. Grain 2 to 2.15 P. M. Chicago live stock 4.30 to 4.45 MINATORE PLUG P. M. Kansas City live stock 7 to 7.15 A new VICTOR product. A beautiful little plug highly polished bakelite shell nickel plated metal parts. For battery control or any switching purpose. Instant connection and disconnection. Mount pin jack P. M. Omaha live stock 7.30 to 7.45 P. shown in cut on your panel. More efficient and better looking than binding posts. With and without M. Central time. 2500 meters. side screw. Without side screw for soldered lead 23 cents each P.P. With side screw 25 cents P.P. Nickel plated pin jack only with nut 11 cents P.P. North Platte, Neb. Call letters KDHM. CORD TIP JACK. Similar to pin jack in cut only smaller and drilled to take receiver cord tips. For Live stock receipts 9 to 9.15 A. M. Chi- connecting receivers in series. Set of four mounted on bakelite base 55 cents P.P. Set of six 75 cents P.P. Nickel plated pins only 11 cents each. cago live stock 12 to 12.30 P. M. Chicago Type 2 Pin Socket. Will take any standard four prong tube including power tubes. Fused. Mail P. P. live stock 5 to 5.15 P. M. Kansas City $1.00. Pins only nickel plated 11 cents. Drags 10 cents. Fuse only 10 cents.. PINS FOR 50 WATT tubes. No "arcing or fusing" 20 cents each. live stock 8 to 8.15 P. M. Omaha live stock 8.3o to 8.45 P. M. Mountain H. LAUGHTER DEALERS-Write for Prices P. O. BOX 78, MEMPHIS, TENN. time. V. 3000 meters.

www.americanradiohistory.com Radio ..Vans for March, 1922 877

uu il ullullllllllllllllulu MuHUllllllHlllllllluuuuMllullulllllllllllHlllll.I.....IllllliullllllllllllullllllllllllllllllllllllulllluuuulluuuluulnlNllü IHmMlulMlulMUlllllllllllullluum Mlullllulallllllllllllullllullllllllulluuuuullllllllllllllululmlllalll.lululuulllllllllllllll, unu iuuuuu,,,HHlHlluullllllllllli llnllM ull.Hllllllllulu "RASCO HAS IT!" for short probably tie most unique supply house in the United States, if not in the THE Radio Specialty Co: - "Rasco" -is immediate and prompt world to -day. This company makes a specialty of small orders, no order being too small to get attention for the simple reason that most of our orders are small. of Rasco goods, The reputation of this house was built upon service. Ask any of your acquaintances what they think on file to prove that we serve the public best! Rasco promptness ! Thousands of unsolicited testimonials Rasco service, is illustrated below. Be sure to get our great catalogue, containing several hundred different parts, which HOURS ORDER DIRECT FROM THIS PAGE. ALL GOODS SENT PREPAID IN 24 THE RASCO BABY BAKELITE PANELS 1100 AUDIO R FREQUENCY DETECTOR We list below six panels, TRANSFORMER In presenting this little De- the sizes of which have many tector, we feel sure that it been selected after care- We llave compared fills e never taken before of the present transform- place fully checking up many but by aey small detector. It does d.mensfons of the most ers on the market a variety of things and does have finally decided upon 1898 popular radio apparatus the most them all well and better than on the market. a type that is many $5.00 detectors. The base is solid, black com- that efficient one we have seen and Note particularly The best position. Mounted on same is a nickel holder our prices are anywhere so far. ampli- binding post which holds a fiutted Hard rubber knob 350-55 fying transformer is that from 25 to 50% lower with its sliding rod member. than those quoted by most other concerns. The reason in which the impedance The outstanding part of the Detector, is the patented of its primary is equal is that we buy these panels in very large quantities, impe- nickel detector cup and binding post. The knurled and we do not cut sheets to order. Remember always to or exceeds the cap unscrews and you place the Galena Crystal in the dance of the plate-to- that when sheets are cut to order they cost you at the cup, then replace the knurled cap and the galena least 50% more than our prices, because you must filament circuit of is held secure. The circular hole in the cap tube in which it is connected. crystal pay for the cutting and the necessary waste. any one on exposes enough of the crystal for ordinary purposes. Note also that we ship these panels prepaid. This We guarantee this transformer to equal No.1898,.Rasco Baby Galeaa Detector. Price, pre- the market. alone amounts to a considerable saving. Frequency Transformer (not paid $0.50 No. 350 6" x 12" x 3/16" thick, each....$1.90 No. 1100 "Rasco" Audio No. 1899, Rasco Baby Detector with Galena and Ra- assembled) each prepaid. $2.65 No. 351 6" x 18" x 3/16" " " .... 2.85 diocite Crystals. Price. prepaid $0.75 No. 352 9" a 12" x 3/16" " " .... 3.00 5.65 ANTENNA CONNECTOR No 353 12" x 18" x 3/16" " .... PANEL SWITCH LEVER No. 354 61/4" x 191/4" x 3/16" " .... 3.50 This antenna connector is made New style switch lever with No. 355 6" x 7'/4" x 3/16" " " .... 1.20 entirely of aluminum. is light lock fork. It is impossible for and will not rust. The only this lever not to make posi- connector of its kind. The 4 tive contact at all times. The "RASCO" LUBRICATED antenna wires go to the upper blade radius is 11/4". Blade PANEL SWITCH holes; the lower hole takes the is nickel plated and polished. A radio switch that has lead -0n. Don't solder your Fork is phosphor bronze. The two nuts at the end is a aerial, don't have loose con- lock fork holds the screw (in 200 monstrosity, for the reason nections. Dimensions 2" high, which it rotates), securely. that it will never stay put. lÿ'4" wide, %" thick. A loose contact is impossible. Our patent spring fork No. 999, Connector, each.. $0.35 999 No. 200, Switch Lever, complete as illustrated..$0.30. holds the switch handle always under uniform ten- 1921 PANEL LITZ WIRE aims, at the same time it KNOBS This wire is recognized as the only thing insures the best contact possible. New wiping con- No. 6241 is for winding coils for Radio instruments. tact, which covers every point of the switch point. P the lock fork, which can DIM III II well made Particularly recommended with our No. Another new improvement is and has a 343 Variocoupler Rotor, for variocouplers, assume three different positions to accommodate the good corru- banked windings, etc. switch to various thicknesses of panels. gation. I is No. 323, Litz Wire, 20 No. 38 strands, No. 1921 "Rasco" Switch, as illustrated, each $0.50. 6241 dia. is 1 ", enameled double silk wire, per foot, $0.02; height is per 100 feet, $1.15 No. 890, Litz Wire, 10 strands No. 38 KNOBS 'F_ ", hole 5/32 ". The shank is 1/4" high. knobs No. 6241, Knob, each $0.08 wire, per foot, $0.01; per 100 feet, $0.75. These 323 No. 891. Litz Wire, 16 cables of three are favorites MARCONI KNOB with all ex the strands No. 38 wire, per foot, $0.03; per 100 feet, Has a central hole of 5/32" and seat to hold $2.25. p e rímetlters screw, dia. is 11/4 ", height % ". Me size of No. 838, Marconi Knob, each s0.í5 both is: dia. only 11/4", height NOTE: This page contains No. 4451 RASCO POSTS 199 eA . 10/32 These are our very a few of our 300 specialties. comes with 8/32 and own patterns. from our bushing. No. 4451, Knob, each...50.06 own designs and look PANEL KNOB mighty handsome on No. 199 (screw length % ") This is a very distinctive knob Knob, each $0.10 any instrument. The and can be used on dials, panels. top knobs are of corn - switches, condensers, etc. It is 202 201 position, the bottom 030 029 exceptional and well made. Dia. iRi NAVY I(EY KNOB brass n i c k IIIIIIIIIIII 11111110 Parts el 1 1/16 "; height 11/16 " :.; comes This navy key knob is now plated polish. with 8/32" bushing. used on all standard wireless No. 202 is nickel plated at bot- No. 815, Knob, each $0.18 keys. It gives the right swing- tom part. ing motion and rests the fin- "Rasco" Binding Post, 8/32 VARIOCOUPLER ROTOR gers. It is a favorite with all thread, each, $0.10 doz., $1.00. advanced amateurs. Once used This rotor is used by all up- is No. 202, Post, each, $0.08 to -date amateurs. Is accurately always used. The screw Nos. 650 and 651 made entirely turned of hard wood and is 8/32 and will fit all keys. in composition with a hexagonal used as a secondary coil. It No. 748, Key Knob, each $0.28 brass nut in center. takes any finish, either shellac No. 650 has 8/32 machine screw. or stain and can be drilled THREADED BRASS ROD No. 651 has bottom wood screw. readily for any size hole. Large 1111111111111111111111MIII111 0 11111111 0 11111 0 1111111 6MIg is we carry two styles, 6/32 No. 650, Post, each $0.08 hole 2" dia. Width -of spool unlannmemneoatiamcommnmmnnowm and 8 /3't. thread. Only 6" 650 651 No. 651, Post, each $0.08 2 ". Total dia. 3%". 8032 lengths sold. No others. Dozen, each style , $0.90 Na. 343 Variocoupler Rotor, No. 8032, Threaded Brass Rod 8/32 thread, per 6" BRASS NICKEL POSTS 343 each $0.75 length $0.08 No. 029, Binding Post, each $0.05 No. 6032, Threaded Brass Rod, 6/32 thread, per 6" No. 030, Binding Post, each $0.04 "RASCO" length $0.06 NAME PLATES RASCO MEE Our name POINTS 827 plates are of THE "RASCO" CATALOG brass with a CONTAINS 50 Nickel plat- black back- VACUUM TUBE ed and pol- ground. Letters are polished -- s nickel. Order by name HOOK -UPS The ished. and number. Complete hook -ups of RASCO HAS IT.^ o 1 1 75 I 2 3 5 6 7 77 76 f owing Each Each all important vac- have bee n 807 "Phones" $0.05 810 "Ground $0.05 uum tube circuits found the most popular. 809 "Aerial" $0.05 812 "Primary" $0.05 are given in clear 811 "Secondary" $0.05 No. I '/4 "x' /4 ", 6/32 thread, ea., $0.03; doz.. 35c 814 "Detector" $0.05 diagrams with com- No. 2, 3/16" high, 1/4" dia., 6/32 thread, ea., $0.03; 813 "Audion" $0.05 866 "On" $0.05 plete explanation. doz., 35c. 865 "Off" 50.05 840 "Increase Cur- to name a few. 839 "Increase Cur Just No. 3, 3/16" x 3/16 ", 4 -36 thread, ea., $0.03; rent" (Left) .$0.10 -The V.T. as a de- doz., 35c. rent (Right) $0,10 834 "Series" $0.05 tector and one -step No. 4, '/4" dia.; %" thick; stem 6/32, ea.., $0.03'/4: 813 "Vacuum 830 "Receive" $0.05 amplifier; regenera- Tube" $0.05 820 "2nd $0.05 Do For- doz., 40e. 831 "Transmit $0.05 Step" tive circuit; 4 -36, ea., $0.03'!4; 827 "Tickler" $0.05 ; V.T. No. 5, %k" dia.: 3/16" thick; stem 821 "3rd, Step" $0.05 est ultraudion doz., 40e 825 "Plate Vario - to receive undamped ea., 819 "1st Step" $0.05 No. 6, 3/16" dia.; 3/16" thick; stem 4 -36, 826 "Grid Vario- meter" $0.05 and spark signals; $0.03'4; doz., 40e. meter" 0 05 835 "B Battery" $0.05 Armstrong circuits; No. 7, 3/16" dia.; /" thick; stem 4 -36, ea., 823 "Secondary" $0.05 817 "Output" $0.05 one step radio fre- $0.03'/4; doz., 40e. 836 "A Battery" $0.05 824 "Primary Con- quency amplifier and No. 75, Switch Stop. °/S" long, 4 -36 thread, com- 818. "Input" $0.02 denser" $0.05 detector; three stage plete with nut, ea., $0.05; doz., 500. 829. "Telephone" $0.05 828 "Parallel" $0.05 audio -frequency am- No. 76, New style Switch Point, to be pressed into 833 "Detector .$0.05 837 "4- -" $0.05 plifier; short wave bakelite panels with forced fit. Wire is sol- Tube" 50.05 841 "(Blank) "(takes regenerative circuits; dered to pin end. Head 1/4"; dia., 1/16" thick. 822. "Coupling" $0.05 pen or pencil V.T. radio telephone; $0.031/4; doz., 40e. 808 "Load'g Coil $0.05 writing) $0.05 4 -stage radio fre- ea., 50c, q u cy No. 77, same as above, but head is Y/4" dia. x 3/16" Price of all of our name plates in dozen lots, en amplifiers; doz., 400. with the exception of the two "Increase Current" radio and audio fre- thick, ea., $0.031/24 quency amplifier, inductively coup led This business was originated with the nnmmtimlw, m m in innunannnnnp 9608 ruk sole purpose to cater to the amateur amplifier; Armstrong Now York who has small orders. ALL OF OUR superautodyne; radio ORDERS ARE SMALL and that is why DEALERS frequency amplifier will never be side- and crystal detector; your small order 200 A will make etc., etc. The catalog contains illustrations. On tracked by us. trial order Get Our Special be you a life customer. Order from the account of its great cost, it cannot distributed "We can only stick Proposition free of charge. Mailed only upon receipt of above illustrations. 200 On account of you once." Try us with a 50e order. The catalog contains illustrations.

1 1 free of charge. ALL GOODS PREPAID. mon inaunnmu nuunuuuuuunnll its great cost, it cannot be distributed Mailed only upon receipt of Factories 15e in stamps or coin. PLAGE, NEW YORK CITY Brooklyn, N Y. Elkridge, Md. 96 PARK III, II,IIIIIIIIIIIHIIIIIIIIIIIIIII, -98 IIII 1I1III, ,IIIIIIIIIIIIIIIIIIIIII1II1, ,,,,,,,,,,,, I, rH" IMrtH, ImnHHHmmr7HHirrmHHHn.,.,,,,, ultrrnlmHmHHMrtHHTallia,MHm^^MHrt^^^m ^"^^ mmlllllllllllll1HHllllllllHllllllllllllllllllllHll1I1 :II11I1I1I11I11 11II 11IIII, IIIIIIIIIIIIII111111111I11II11II11IIIIIIIIIIIIIIIVII...., II^ m

www.americanradiohistory.com 878 Raaio News for March, 1922

Rock Springs, Wyo. Call letters KDHN. Live stock receipts 9 to 9.15 A. M. Chi- cago live stock 12 to 12.3o P. M. Chicago live stock 4.30 to 4.45 P. M. Kansas City MR. DEALER: live stock 8 to 8.15 P. M. Omaha live stock 8.3o to 8.45 P. M. Mountain time. 3000 meters. Ask your jobber for the "PINKERTON DETEC- Elko, Nevada. Call letters KDEJ. Live TOR" -the crystal receiving set that always brings in stock receipts 8.3o to 8.45 P. M. Chicago live stock 12 to 12.30 P. M. Chicago live the concerts and speeches-clearly and distinctly - stock 4 to 4.15 P. M. Pacific time. 3000 within fifty miles of a broadcasting station. meters. Reno, Nevada. Transmits on 3000 meters And you can sell this set for $25.00 with a pair of 2000 at t o A. M. ohm, Weather reports for mailplane pilots are highly sensitive head receivers. broadcasted whenever conditions require it. If you want additional information, Pilots listen at all times while in the air. drop us a card. The above market ,reports, whether sent Yours very truly, in Morse code or by radio telephone, are given by using abbreviations that would not NATIONAL SERVICE COMPANY, be understood unless the receiver had before him the blanks provided by the General Sales Agent, Bureau of Markets. A supply of these should be obtained from the Bureau. With 1834 Broadway. them even a novice can receive the reports. New York, N. Y. The reports are repeated by a number of local radio stations, especially those con- Manufactured by nected with State Universities and Col- leges. Details can be obtained locally. CONCERTS, STORIES, LECTIIRES, NEWS, PINKERTON ELECTRIC EQUIPMENT CO. SERMONS Akron, Ohio. Monday, Wednesday and Friday, 6.3o to 7 P. M. Eastern Standard Time, 190 or 200 meters, Radioart Store station. Call letters SUX. Radiofone, latest phonograph records. Normal range 3o miles. Exceptional range, 200 VACUUM miles. TUBE RADIO Friday evenings. Cleveland Radio As- "MIRACO" RECEIVER 150 -600 Meters sociation. Concerts: Daily except Sunday, 8 Tlink of buying a complete Vacuum Tube Re- to 9 P. M., Eastern Standard Time, 375 ce_ving Set including B Battery, Radiotron meters. Vacuum Westinghouse station, Pittsburgh. Call Tube, Murdock 2000 Ohm Headset, letters 15o ft. Aerial Wire, Insulators and ground KDKA. Press and music. wi-e complete ready for use for only $29.5o Sunday, 7 to 8 P. M. Same station. Prepaid. Church service. Only additional equipment necessary Atlanta, is a 6 volt storage battery or 4 dry cells and Georgia. Daily 7 P. M., Eastern you are ready to experience the thrill of catch- Standard Time. 5500 meters. Mexico ing signals, voice and Radiophone Concerts out City, Mexico, station. Call letters XDA. of the air. Spanish press. Daily 8 8.15 P. Miraco to M. 4000 meters. Radio Receiver, without these acces- Cincinnati station. Call letters KDQC. sories, $18.00 Prepaid. Order direct from this Press. ad or write for literature describing this ap- Daily except Sunday, 7 to 8 P. M. 375 paratus. Prompt mail order service on any meters. standard equipment. Westinghouse station, Pitts- Give us a trial. burgh. Call letters KDKA. Press and Dept. MIDWEST RADIO COMPANY A, 3423 DRURY AVE. music. . CINCINNATI, OHIO Sunday, 7 to 8 P. M. Same station_ "EVERYTHING FOR THE RADIO MAN" Church service. Daily except Sunday, 7 to 8 P. M., 375 meters. Westinghouse station, Newark, N. J. Call letters WJZ. Press and music. Schedule unknown. 200 to 250 meters_ Government station, Anacostia, D. C. Call letters NSF. Radio telephone. ieRHAMSTINE* No regular schedules. zoo meters_ Amateur stations 4ZF, 4BT, 4CO, 4VA, Music. Adapt -O - Phone Sunday, Tuesday, Thursday, and possibly Saturday, 7.30 to 8 P. M. 200 meters Will solve your laud- speaker problem. (may change to 275, 325 or 375 meters). Any standard head-set can be used. The sounds from two Carter Electric Company. Call letters matched receivers enter the manifold and emerge clear and, loud from the large horn. 4CD. Music and press. This station was installing The special construction of the manifold originated in the Rham radio telephone on date of re- stine* Shops. The angle of the receivers, the manner of holding port. them firmly at the two openings and the proportions of the horn No schedule. were all Amateur station Rome, carefully determined. Maximum amplification is ob. Georgia. Call letters 4BQ. tained from two receivers in combination with the Adapt-O- Phone. Radio tele- The entire unit is 20 inches high. phone. Range said to be Soo miles. Berlin, N, H., Y. M. C. A., is installing PRICE Receivers $1 2.00 radio telephone transmitter for broad- Send for complete folder. Dealers casting program of interest to the public_ wanted everywhere. Buffalo, New York. Daily except Sunday, Manufactured by 8 to g P. M., Eastern Standard Time. 375 meters. Westinghouse Station, Pitts- J. THOS. RHAMSTINE burgh. Call letters KDKA. Press and music. 2152 E. LARKED ST., DETROIT, MICH. Sunday, 7 to 8 P. M. Same statio:. Church service.

www.americanradiohistory.com Radio News for March, 1922 679 SIDBENEL RECHARGEABLE STORAGE "B" BATTERY A "B" Battery that will last forever Guaranteed for two years

The New Sidbenel Heavy Duty Radio Storage "B" Battery is creating a remarkable reputation and is especially popular in radio phone receiving stations where a heavy demand of current is required to supply a loud speaker. A single charge given to a SIDBENEL "B" BATTERY will last five times as long as the best dry battery made. The signals will not fade, nor will the set howl, and it will be noticed that the radio phone signals will come in much clearer and louder. When a SIDBENEL battery becomes discharged, after about four to six months of constant service, you do not throw it away like that of a dry "B" battery, and have the expense of buying new batteries, but you simply mail it to your nearest dealer, or, if you like to us. Upon receipt, we will reship you immediately a recharged "B" battery of the sane type for thirty -five cents. Or, if you have any source of electric current in your home, you can charge the "B" battery yourself in less than two hours without any trouble or danger whatsoever. With every battery complete details for making your own rectifier that will not cost more than twenty -five cents is included with the instructions for charging. SIDB'ENEL "B" BATTERIES are put up in moulded and sealed hard rubber blocks 4/, in. long by 2r/z in. wide and 3 in. IMMEDIATE DELIVERIES deep with a voltage 25 volts each tapped from two volts up. $6.50 Price for two Batteries, $12 00 Should you need a higher voltage you simply buy the required Price per Battery, amount of blocks. However, one battery will supply all the bulbs DEALERS AND JOBBERS on the set that needs 50 volts, etc. Is it not better to buy a in- Read this ad over very carefuly, The SIDBENEL STORAGE ' B" good battery that will give you years of service than many BATTERY will increase your sties far over that of the old typo 3ry ferior batteries that cost more in the long run? Go to your "B" battery.. Large territory will be given to a good reliable dealer nearest dealer and let him show you a SIDBENEL "B" BAT- or jobber. Write or wire and give preferred territory and the ap- TERY and get that TWO YEAR GUARANTEE. If your dealer proximate amount of batteries you can handle. cannot supply, order direct from us.

SIDBENEL RADIO MFG. CO., NewnYo k City, N Y.

DUC NEW CATALOG No. 16 275 Pages A Catalog Deluxe Send 12c today (stamps or coin) for copy of the Type CV greatest radio catalog ever put between the Crystal Receiving Set pages of two covers. The ideal receiving set for shirt wave telephone and telegraph receptial, Wave length ranga 700 meters. Never in the history of radio has there been such a catalog. The radio data and diagrams embracing upwards of fifty pages gives the experimenter more valuable and up-to -date information than will be found in many textbooks selling for $2.00, and $1.00 ccu:d be spent for a dozen different radio catalogs before you could gather together the comprehensive Listing of worth while radio goods found in this great catalog. A brief summary of the radio goods listed in this catalog: The entire radio catalog of the Radio Corporation, with a wealth of scientific and technical data on C.W. transmitting sets, and all the diagrams for the assembling of these sets; the ecmplete Bernier catalog, which embraces 25 pages, the Westinghouse, Firth, Murdock, Federal, DeForest, Clapp- Ecstham, Brandes, Connecticut Company, Thordarson, Turney, Magnavox Company catalogs, the best products of Adams -Morgan, Signal and countless other manufacturers, including our own complete line of radio apparatus, and many individual items and parts used in radio work toda'. Grained Formica Panel 8 inches x 6% inches x % inch. Three inch Realer dials. Crystal Detector extremely sensitive and DEALERS easily adjusted. Mr.rdock 2,000 ohm telephone receivers. F-irnished in rivo styles We want live respon,ibde dealers in every city and town in the United States. both for the sale of our complete. Panel tyl e as illustratbd $25.00. extensive lino of rod o apparatus and all other worth while lines of radio goods on all of which we can Cabinet type with deep cover ant compart- quote attractive dealers discounts. We can offer you facilities and advantages that no other radio house ment for receivers, $30.00. can offer. Send only 12e -or copy of this wonderful catalog. You will need no other when you have Duck's, and vru cannot find in all others combined what you will find in Duck's Wonder Catalog.

THE WILLIAM B. DUCK CO., 231 -233 Superior St., Toledo, Ohio

www.americanradiohistory.com tS8o Radio News for March, 1922

Daily except Sunday, 7 to 8 P. M., 375 meters. Westinghouse stations. Newark, N. J. Call letters WJZ. Press and music. Monday and Thursday, 8 to 9.3o P. M., 450 meters. Canadian Independent Tele- phone Company, Toronto, Canada. Radio telephone, wonderfully clear voice modulation. Boston, Mass. Daily except Sunday, 8 to 9 P. M., 375 meters. Westinghouse station, Pittsburgh. Call letters KDKA. Press and music. Sunday, 7 to 8 P. M. Same station. Type TRU Concert Receptor, $50.00 Church service. No schedule. H. A. Beale's station, This unit is especially designed for the efficient reception of Radio Telephone Parkersburg, Pa. Call letters 3ZO. Concerts from even the most distant Broadcasting Stations. The ease with Radio telephone. which this Receptor can be installed and of operation the extreme simplicity Daily except Sunday, 7 to 8 P. M., 375 make it ideal for use by even the most inexperienced. No previous knowledge meters. Westinghouse station, Newark, of radio necessary to secure results. N. J. Call letters WJZ. Press. Music. We stock a complete line of Radio Supplies and maintain a prompt, reliable Mail No schedule. T. F. J. Howlett's sta- Order Service that reaches all over the world. tion, Philadelphia, Pa. Call letters 3AWI. Radio telephone. Send 5e in stamps or catalog to Dept. "A" No schedule. (too and 250 meters.) Government station Anacostia, D. C. Call letters NSF. Radio telephone. THE PRECISION EQUIPMENT CO., INC. No schedule reported. Variable wave Manufacturers, Distributors and Retailers of Radio Apparatus lengths. Union College, Schnectady, New Cable Radio York. Call letters 2XQ. Music. Church ACEAddress Peebles Corner Cincinnati, Ohio WISH service. Cincinnati 8XB Daily, 8 P. M., 350 meters. American Radio and Research Corporation station, Medford Hillside, Mass. Call letters WGI. Boston city police reports, first in International Morse Code, ten words per minute, then by radio telephone. Radio Service Wednesday, 8.15 P. M. Same station. Concert. We give our customers the best SOMETHING NEW- Tuesday and Thursday, 8.15 P. M. service possible - Same station. Burgess Bed Time Stories. Baldwin Radio Frequency Monday, 8.15 P. M. Same station. Stand behind all goods we sell. Transformers will bring sig- Publicity and information of general in- "Highest Efficiency" our mot - nals you never heard bef re. terest. to- Can use as much amplification Saturday, 8.15 P. M. Football, base- as desired. Wave length 200- ball and other athletic events and gen- We are distributors for all 400 meters. Price $3.50. standard makes of Radio Ap- eral news. paratus- Special broadcasts. Same station. U. Try our H. G. "B." batteries. S. Public Health Service Lectures. De- Exhibitors of Westinghouse Long life and ideal for Radio. tailed reports of World Series. Concerts Radio Equipment at New York 22% volt small, 98e -large vari- by high class artists. Sermons on Sun- Edison Show Rooms- able 15 -22% volts, $2.25. days. Address by prominent speakers. Business reports. Heard in Indiana, Address all inquiries to Radio Dept. North Carolina, Canada, Texas, and on H. Goldberg (Est'd 1894) board ships in the Atlantic. We sell Anything and Every- 1373 Third Ave., Bet. 78th & 79th Sis. No schedule. Raymond F. Farnham's station, R. Electrical NEW YORK, N. Y. Pawtucket, I. Call letters thing IOJ. Radio telephone. No schedule. Thomas Giblin's station, Pawtucket, R. I. Call letters IXAD. Radio telephone. VERNIER RHEOSTAT Cambridge, Mass. Daily except Sunday, Another New Step 8 to 9 P. M., 375 meters. Westing- house station, Pittsburgh, Pa. Call let- in Radio ters KDKA. Press and music. 11ENERNIER Vernier Rheostat. No flicker- Sunday, 7 to 8 P. M, Same station. ing of lights. Smooth running Church service. and adjustable to one milliam- No schedule. 1600 meters. Station of FN'AIN UNIT pere. This article will fill a National Amateur Wireless Association. long -felt need in the Radio New York City. Reports of athletic field. No A or 13 potentiometer championship events such as the Demp- 4-UANEL necessary with this vernier sey- Carpentier fight, and the baseball rheostat. World Series. Concerts by famous musicians. Daily papers announce details

4E-RESISTANCE Save your money and use these en needed by persons who wish to hear the your new control panels. broadcasts from this station. Daily except Sunday, 7 to 8 P. M., 375 meters. Westinghouse station, Newark, EAIJUSTABLE Buy of your dealer or from us. CINTACT N. J. Call letters WJZ. Press and music. Daily, 7 P. M. H. B. Richmond re- TECO RADIO CO. ports : "One station using but a single aerial, detector and 2 -step amplify- LIST PRICE $1.50 P. 0. Box 3362 BOSTON, MASS. wire ing unit, has been able to copy the time signals from Honolulu, Hawaii, and

Nauen, Germany. . . These stations are A welcome addition to your library! Send $2.30 today, pins postage for 7 lba., and your copy of bound volume No. 2 of Radio News will come forward by return mail. sending the time signals 12 hours apart, Experimenter Publishing Company, Inc. 236a Fulton Street, New York City yet they are received in Boston simul-

www.americanradiohistory.com Radio Nc2Gs U1'i'a, 422 88I

IEOL RADIOA° E CE Vn BRACH RADIO PROJECTORS TAMER° IONS J The National Electric Code Permits the use of Vacuum Tube Protectors in place of the Grounding ,. Switch Formerly Required. THE BRACH RADIO PROTECTOR TUBE - MEETS THE REQUIREMENTS t 1 Where Radio Transmitters are Operated from Public * ' Service Mains, two Brach Radio Protectors con- = nected in series, with midpoint grounded, furnish the least expensive, and the best protection against surges. Price $2.50. Order early to make sure of obtaining a supply. Patents allowed and pending. Manufacturers of /. Lightning Arresters, Signal, Telephone and Wireless Specialties. L. S. BRACH MFG. CO., 127-129 Sussex Ave., Newark, N. J. \____ AMATEUR & PROFESSIONAL WIRELESS OPERATORS

= - - USE SOLDERALL Pat. Oct. 3, 19H PER --- SOLDEß LL : I SOLDERALLOLD 25c PER SOLDERALL TORCH $1.50 J A PASTE THAT TURNS INTO METAL WHEN HEATED A match will do it, but best results can be obtained by using our new improved torch. Requires no acid or soldering iron. Joins or repairs wires, metal or_. metalware. Sold by Hardware and Electrical Stores, or sent by us postpaid x¡ 1 rewire of Imitations with Similar Names. Dealers Send for Quantity' Prices ¢ Q,'. - tz Want distributors in every wok, large City- Distributor -PITTSBURGH, PA. - CI Sr, Get our proposition. Ludwig Hommel & Co. a `4" ,n. L. S. BRACH MFG. CO., 127 -129 Sussex Ave., Newark, J. =a

Saves Bulbs from Burning Out!

Placed where every bit of "juice" going into the filament of your vacuum tube must go through it before reaching the filament itself; the

Slides directly on terminals RADEGO SAFETY FUSE

makes it absolutely impossible for any No trouble to attach! This fuse slips excessive amperage, cven if set up by directly on the filament terminals of an accidental ' short ", to "burn out" any standard bulb in any standard a tube. socket. Come only in Order by mail packages for or from of four 1 your dealer

air:l though de- 4 sirncd primari- Carrying capacity, ? 2 3/4, I, 11/4, II/2, 2, 27 and 3 amperes. ly to prevent Vacuum 1 -isbas "brrnl+g out" the R.-ID9iCO Safety Fuse is DEALERS ! This is a 'live" one growing every day. Write today for dealers price list. cam-Illy good for the pro - tection of actors and other dcllica.tc instruments. Look. over your set. Ilote much td it cost you ro rchlace parts that n ight be burned RADIO EQUIPMENT Exclusive cot "P CO. 630 Washington Radio i g St. Boston, Mass. Store

www.americanradiohistory.com 682 Raaiu News for March, 1922

taneously. Kauen is sending signals at midnight.... The time signals from Honolulu are being sent out at 12 o'clock noon of the previous day. Because of the difference in time both come in at Bos- ton at 7 :00 o'clock P. M. It is quite effective to sit at one's apparatus and by simply turning the condenser knob shift from Germany to Honolulu, realizing as we do that these places are 12 hours apart ; in other words, on opposite sides Wireless B Battery of Pat. apd. for the globe. Refillable Variable No schedule. Local radiophone con- No. 100-22% certs. Volts Price $3.00 No. 140 -225 Volts Size 7 x 4 / x 4,gg Size 4i x24x2y Price $2.00 Chicago, Illinois. 8 P. M. Westinghouse station, Chicago. Call letters KYW. Refillable and variable B Battery especially designed for Vacuum Music. Grand opera every night. Navy station. tube work on plate circuits is guaranteed to be perfectly noiseless, it will Call letters NUR. give double Weather forecast, market reports. Press. the life of the ordinary battery. Army The above cut shows station at Fort Sheridan (not part of the cover cut away which illustrates the complete for public transmission on date convenience in inserting a new cell should one prove defective. These re- of report). placements are furnished complete with a positive and negative terminal Police and Fire Departments reported soldered fast, and will be sent to to be experimenting with radio tele- any address upon receipt of 25c. They phone. can be inserted without the use of soldering iron if desired. Amateur stations 9XG and 9LY. Music. Sample mailed to any address upon receipt of List price Cincinnati, Ohio. Daily except Sunday. 7 to 8 P. M. Central Standard LIVE JOBBERS AND DEALERS Time. WANTED 375 meters. Westinghouse station, Pitts- burgh, Pa. Call letters KDKA. Press and music HIPWELL MANUFACTURING CO., N. S25P TTSBURGHe P,A. Sunday, 6 to 7 P, M. Same station.. Church service. Schedule not given. Government sta- D H. E. Co. Pittsburgh Broadcasting Station Call, K.Q.V. tion, Anacostia, D. C. Call letters NSF. Radio telephone. Monday, Wednesday and Saturday, Highest Grade Radio Equipment P. M. Central Standard Time. 375 Best results can be obtained by using Radio Equipment and meters. Station of Precision Equipment Supplies sold by us. - Co. Call letters SXB. Music, vaudeville. baseball Distributors for Grebe, DeForest, Murdock,- Signal, Chelsea, scores and other information of Magnavox, Radio Corporation of America, Westinghouse, and value. Heard in Iowa, Michigan, Illi- other Manufacturers of highest grade Radio products. nois, Minnesota, Canada, Pennsylvania, Order Virginia, Florida and Tennessee. By Mail Cleveland, Ohio. Sunday, 7.30 or 8 P. M. Enclose Certified Check or P. 0. Money Order Eastern Standard CR 9 Grebe Receiver Time. Station of Cox $130.00 Manufacturing Company, CR 5 Grebe Receiver 80.00 Cleveland. Call RORK Grebe 2 -stage Amplifier 55.00 letters SACS. Zoo meters. Music and R2 Magnavox Loud Speaker voice. Can be R3 Magnavox Loud Speaker 110.00 heard with mineral detec- 45.00 tor receivers in Cleveland UV 200 Radiotron Detector Tubes, each 5.00 and suburbs. UV 201 Radiotron Detector Tubes, each 6.50 With amplifiers it is heard clearly at dis- No. 766 Eveready VT Batteries, each 3.50 tances up to 5o or 6o D.H.E. 6 volt, 80 ampere storage miles and has re- R3 Magnavox batteries, each 18.00 peatedly been heard at Loud Speaker distances of sev- Full List of Parts and Supplies with Prices on Request eral hundred miles. Thursday evenings. Concerts cinder DOUBLEDAY -HILL auspices of Cleveland Radio Association. ELECTRIC CO Different members give these 715 Twelfth St., N. W., Washington, D. C. Radio Dept. Desk B 719 -21 Liberty concerts. Ave., Pittsburgh, Pa. They are heard throughout Greater Cleveland and sometimes at greater distances. Daily except Sunday, 8 to 9 P. M. RADIUM JEWELL 375 meters. Westinghouse station, Pitts- DETECTOR burgh, Pa. Call letters KDKA. Press Requires no adjusting. Only occasional tuning, and music. which can be done in one second. Sunday, 7 to 8 P. M. Same station. No battery Church service. used. Can be applied to any receiving Reception set. Takes the place of crystal detectors. No more of broadcasts from the above fiddling around for sensitive spots; just pick up station is subject to local interference. Detector Bulb .60 the phones and listen. Worth several times the Almost any evening. Various radio price asked for this new Bulb Holder invention. If your dealer telephones. .40 can't supply, we will mail direct. Occasionally in the evening. Westing- Dealers write for proposition. house stations at Newark, N. J., and Chi- cago. Music and press. Newark Electrical Supply Distributor for New Jersey Columbus, Ohio. Monday, Wednesday and STAR MFG. CO., Newark, N. Friday, 7.3o P. M. Central Standard J. Time. Zoo meters. Station of Electri- cal Specialty Company. Call letters. 8BYV. Music, football scores, baseball TELLS TIME BY THE SUN scores and other news. A Vest Pocket Sun -dial THE ANSONIA Daily except Sunday, 7 to 8 P. M. Cen- D Compass in one. tral Standard Time. 375 meters. West- DAN BEARD says: "I would like UNWATC}I inghouse Station, Pittsburgh, Pa. Call to see every scout have one ". letters KDKA. Music and press. Mar- ket reports. THE ONLY COMPASS THAT GIVES THE TRUE DIRECTION Sunday, 6 to 7 P. M., Central Stand- ANDREWS AND HOLLINWOOD, postpaidctr ard Time. Same station. Church ser- 500 FIFTH AVENUE, $1.00 NEW YORK. Department 3 vice. Daily except Sunday, 6 to 7 P. M.,

www.americanradiohistory.com Radio News bor March, 1922 883

ANNOUNCEMENT A New Arrival In the DeForest Family - THE MOULDED, INHERENT- BALANCE CONDENSER Movable and Stationary Plates are divided into two sets of movable plates being moulded onto the shaft on - opposite sides. Stationary Plates are moulded to six sup- porting columns. MEIN This new model is made in three capacities, both mounted (as illustrated) and unmounted. Prices unmounted include knob and dial. CV -101, capacity .0005, mounted $5.00 CV -100, capacity .0005, unmounted 4.75 CV -201, capacity .001, mounted 5.50 - CV -200, capacity .001, unmounted 5.25 ('V -301, capacity .0015, mounted 6.00 CV -300, capacity .0015, unmounted 5.75 DeForest Radio Telephone & Telegraph Co. 1391 Sedlgwick Avenue New York City

THE ONE BEST WAY PA CENT IZE ! Why fuss about with binding posts and unsightly frayed wires when Pacent Radio Essentials will allow you to change connections in the twinkling of an eye? This Pacent combination was made to work as a unit in overcoming all connection problems in both receiving and transmitting apparatus. When the Plug, Twin- Adapter and Multi -jack are used together, they replace no less than fourteen binding posts! PACENT UNIVERSAL PLUG This plug was the first real radio plug to make an appearance and it remains the first radio plug in quality. A solderless, biting contact is made which will not give rise to disturbing noises. You can use the Pacent Plug with 'phones, Duo- Lateral Coils, microphones, keys, etc. The Patent Plug fits any jack. With its soft, velvety black finish it will add a touch of beauty to any receiver. PRICE $1.25 Catalog No. 5o PACENT UNIVERSAL PLUG, Price $1.25

PACENT TWIN - ADAPTER You can't put two plugs in a single jack, but you can malte a single jack serve the purpose of two jacks with a Patent Twin -Adapter. Just insert he Twin- Adapter and presto! -the usefulness of the jack is multiplied by two. Just the thing to use with a loud speaker; tune with the 'phones and then plug in the loud speaker. The Twin _Adapter has a multitude of uses in C.W. work. Catalog No. 52 Pacent Twin- Adapter, Price $1.5o PRICE $1.50 PACENT MULTI -JACK Here is another worthy member of the Patent plug and jack combination. This is really three independent jacks built into a beautiful composition base. Screwed to the side of a receiving outfit it will allow three sets of 'phones to be plugged in or two sets of 'phones and a loud speaker. It may also be screwed to the table or the testing board. All standard plugs will fit into it, but it was designed especially for use with the Patent Universal Plug or Pacent Twin -Adapter. Catalog No. 52 PACENT MULTI -JACK, Price $1.5o PRICE $1.50 Send for copy of circular N100 See the Pacent Radio Essentials at your dealers. Dealers and Jobbers -Write for our sales plan PACENT ELECTRIC COMPÍ'NY INCORPORATED LOUIS GERARD PACENT, President 150 NASSAU STREET NEW YORK CITY Member Associated Manufacturers of Electrical Supplies.

www.americanradiohistory.com 884 Radio News for ,4larch, 1922

Central Standard Time. Westinghouse station, Newark, N. J. Call letters WJZ. Market reports, music, press. No schedule. Doron Brothers Electri- AT LAST! cal Company, Hamilton, Ohio, station. Zoo meters or over. Radio telephone. The first successful vernier adjuster which may McCook Field, United States Army, be quickly and easily attached to any receiver Dayton, O. Call letters WA -1. Radio or type of dial. telephone. No up -to -date set is complete without United States Army station, Fairfield, Ohio. Call letters WL -2. Radio telephone. No schedule reported. 275 meters. The "Q -R" Vernier Adjuster Station of Ohio State University, Colum- bus. Time signals, market reports and other useful information. Call letters Price, $1.50 BYO. Daily except Sunday, 12.35 P. M., Cen- tral Standard Time. 800 meters. Uni- Enables perfect micrometer adjustments and versity of Wisconsin station. Call let- practically eliminates capacity effect from the ters gXM. Weather forecast for Wis- hands. consin. In International Morse Code, Liberal proposition to dealers. 18 words per minute. Repeated at 7 words per minute. Then repeated by Pat. Appd. For voice from radio telephone three times. Daily except Sunday. Same station ROBINSON and wave- length. 12.15 P. M. Report of SPECIALTY COMPANY Wisconsin Department of Markets. Same 13 Walnut Street Keyport, N. J. code, ro words per minute. Special abbreviations are used. Persons interested "YOUR DEALER HAS THEM" should secure from the University Forms MI -20 and MI -22. Reports are repeated by voice from radio telephone, using same special abbreviations, beginning 12.50 P. M. Friday, 7.30 P. M. Same station and wave -length. Edison phonograph music. BETTER At 8.15 P. M., wave- length is changed A VT SOCKET - to 375 meters for the benefit of those whose receivers will not receive the longer wave. Concerts given in the Uni- versity Armory by distinguished artists such as Vecsey, Lhevinne and Casals are transmitted by radio telephone in place of the phonograph concerts whenever the consent of the artists is obtained. Monday, g to í1.3o P. M., Central Stand-

ard Time. - 375 meters. Same -station. Campus news exchange with other universities. International Morse Code, 20 75c 75c words per minute. Tuesday, Thursday and Friday, io to 12 P. M. (beginning one hour earlier on Friday). Same station. 33o meters. The No. 707 WHITALL AUDION SOCKET is moulded of condensate, heat proof and strong. Exchange of messages with amateurs. No possibility of loose connections. Contacts are of lamented phosphor bronze with dual Wave -length raised to 375 on Friday. wipe contacts. Both bottom and side pressure insures a positive non -leaking contact. Ca- Speed adapted to the operator who calls. pacity effect, current leakage or dielectric less are at an irreducible minimum. Note absence of metal. Can be either front or back connected. Monday, Wednesday and Saturday, 8 P. M., Central Standard Time. 375 DEALERS WRITE FOR SAMPLES AND DISCOUNTS meters. Station of Precision Equipment Company, Cincinnati. Call letters 8XB. Music, vaudeville, baseball scores and The Whitall Electric Company other information. No schedule given. Station of Univer- Mass. sity of Iowa, Iowa City. Call letters Springfield, gYA. Market reports by radio tele-

phone. - No schedule given. Station of DeFor- est Radio Telephone and Telegraph Corn - VOU HAVE A BEAUTIFUL FACE pany, Ossining, N. Y. BUT YOUR NOSE? Dallas, Texas. Rumored that the Westinghouse Company will establish a

broadcasting station - similar to that at Newark, N. J. Davenport, Iowa. Tri -City Radio. Electric Supply Company reports : "Physically impossible to list all the calls heard. We get all the stations sending market reports. Hear Los Angeles music. Get NAH (U. S. Navy station, New York), like a "ton of bricks." Denver, Colorado. Daily,. to P. M. Y. M. BEFORE AFTER C. A. station. Time signals; weather re- IN THIS DAY AND AGE attention to your appearance all times. Permit no one to sea you looking otherwise; is an absolute necessity if you expect to make the it will injure your welfare; Upon the impression you port and news. most out wish to appear constantly make rests the failure or success of your life. of life. Not only should you Which is to be your ultimate destiny? My new Nose - Thursday, 8 to 9.30 P. M. Fitzsimons as attractive as possible, for your own self- satisfaction, Shaper, 'TRADOS" (Model 24) corrects now ill- shaped Hospital which is alone well worth your efforts, but you will find noses without operation, quickly, safely and. permanently. station. Concert. the world in general judging you greatly, if not wholly, Is pleasant and does not interfere with one's daily Daily, 8.3o A. M. Station of Reynolds by your `looks," therefore it pays to "look your best" at occupation, being worn at night. Radio Company, Inc. Weather forecast today free booklet, which tells you how toe rrect ill-shaped noses without cost if not satisfactory Write for (voice only). Radius 25o miles. Call Face Specialist 1588 Ackerman Bldg., Binghamton, N. Y. 1 M. TRILETY, letters 9ZAF.

www.americanradiohistory.com 885 Radio J l cws, for March, 1922

Compare it with ANY It SPEAKS for ITSELF

Pat's Pend F. O. B. -N. Y. Bring your station up to date Nothing to get out of order. You don't have to BUY EXTRA PARTS. A high class LOUD talker with polished aluminum body and nickle plated base and horn. Just slip your bead phones on the KING "Am -pli- tone" and you and your friends will beSURPRISED No distortion. Big Volume and Fine Quality for both Music and Speech. The volume is DOUBLED because TWO head phones are in service and are blended into one POWERFUL tone. Order from your dealer or direct. Dealers write for Proposition. THE KING "AEI -PLI -TONE" 82 Church St, New York City Immediate Shipments

The Recognized House for Service I and Quality When Ordering By Mail A KNOCKDOWN RECEIVER FOR $15.50 SET CONSISTS OF -1 Stained oak cabinet 18 s 7 z 7, re m ra- v.a,nr ble top and back, polished FORMICA panel 18 x 7 z 1/2 to fit cabinet, 2 variemeters, 1 FORMICA coupler tube, 1 secondary - 4 ball, 1 switch lever, 6 binding posts, 7 switch points, 2 switch s set all necessary Darts screws, etc.. for assembling the set together with a winding form to be used for winding Inside of variometers.

om :- y _, PRICE $15.50 as shown in cut; $19.50 with all windings in place TELEPHONES Type C Baldwin $12.00 type E Baldwin 13.00 Type F Burdocks 14.00 r`" \o. 56 Murdock 2000 ohm 5.00 °' NOV 56 Murdock 3000 ohm 6.00 At p 4i x ='- RHEOSTATS wt1 No. 25 Paragon $ 1.50 \ ï-V - - No. 214 General Radio 2.50 No 560 Murdock 1.00

No. 120 -A FADA new type - 1.00 _. ------No. 810 Bernier 4 ohm 1.00 ANTENNA WIRE "B" BATTERIES No. UV -202 Radiotron 5 watt 6.00 BRAIDED AEROPLANE UV -203 Radiotron 50 watt 30.00 Per 100 ft. .50 763 22V volts $2.00 No. Eveready No. 14 Bare capper wire, per 100 ft. .95 No. 766 Eveready 221/2 volts tapped 3.00 REGENERATIVE RECEIVERS Burgess 22% volts tapped 3.00 No. CR -3 Grebe 175 -610 meters $65.00 No. 5156 80.00 No. 2166 Burgess 221/2 extra large 3.50 No. 011-5 Grebe 175 -5000 meters LOUD SPEAKERS No. CR -8 Grebe 175 -1000 meters 80.00 VACUUM TUBES 175 meters with det. and No. A -2 Magnavox. new type 45.00 No. CR -9 Grebe -3000 type No. UV -200 Radiotron Det. $5.00 two stage amplifier. complete 130.00 VOCOLOUD. station 30.00 No. UV -201 Radiotron Amplifier 6.50 No. RA, Westinghouse 150 -700 meters 65.00 We have a complete stock of standard apparatus if there is anything that you can not find in the above list jug' send your order for it at the regular list price and it will be shipped at once to you. ORDER OUR SEND YOUR ORDER IN NOW CAREFUL ANDw APPRECIATIVE OUR MOTTO WE GIVE ALL WE CAN FOR WHAT WE GET Instead -OF GETTING ALL WE CAN FOR WHAT WE GIVE MISSOURI RADIO SUPPLY COMPANY 4623 MARYLAND AVENUE Dept. S ST. LOUIS, U. S. A. a --__VV

www.americanradiohistory.com S86 Radio News for March, 1922

Daily, g P. M. Same station. Weather forecast (voice only). Radius t,000 miles. 4 Sunday, 8 to to P. M. Same station. KLOSNER Concert. Radius t,000 miles. This music is used for dances in Wyoming, Neb- you want a shielded raska and Kansas. amplifying transformer VERNIER Galveston, Texas. Galveston Wireless Supply in a moisture proof Company reports : "Hear press 1 and music from Houston, 65 miles away. bakelite case, get a Do not know schedules. We expect to RHEOSTAT install 3o -mile radiophone and later a transmitter for relay and press wo-k on regular schedule. G.A. A.F. Transformei' Hartford, Connecticut. Tuesdays, Thurs- days, Saturdays, 8 P. M., Eastern Stand- The only transformer different in ard Time. 425 meters. Station of The design from any other made, and C. D. Tuska Company. Call letters WOB. guaranteed to give louder signals Concerts. These have been heard over a with less distortion than any other range of approximately goo miles. transformer at any price. Its ex- Johnstown, Pennsylvania. Hack's Electri- clusive features are: cal Store broadcasts program of interest T. No iron laminations, but not to the public. an airccre. Kansas City, Missouri. 11.30 A. M. 375 2. Solid, polished maroon bakelite meters. Station of Western Radio Com- case. Patent pany. 3. Pending Call letters 9NAB. Kansas City Absolutely moisture proof. Can Live Stock Market reports and weather be left in water without dam- FOR THE MODERN forecast. Voice only. age. 2 P. M. Same station. Kansas City 4. Very small in size. CRITICAL TUBE and Chicago Live Stock Market report, 5. Easily mounted in any position. grain market and weather report. 5. Entirely shielded. The first and only Vernier 7. And- Rheostat made having but 7.30 P. M. Same station. Repeats market and weather reports, followed by The Price is ONE SINGLE KNOB concert at 8. 8.3o to g P. for both rough and fine adjust- M. Same station. Con- $5.00 cert. Phonograph, and vocal and instruments mental music. Postage 10c SIMPLE QUICK Radio telephone is used exclusively in the above broadcasts and the voice at the 88-N Park Place POSITIVE telephone is heard over a range of 1,000 The General miles. New York City Highly finished Condensite base Apparatus Company Send 10c for the new and knob. Phosphor bronze con- Lincoln, Nebraska. Noon and 7.30 P. M. P J G. A. Catalog tact springs. All metal parts University of Nebraska station. Call let- polished nickel plate. ters gYY. Phonograph concerts. Range Diameter 21/8 inches. several hundred miles. Los CARDBOARD TUBING Angeles, Cal. Hamburger's Depart- IN ANY LENGTH ment Store broadcasts UP TO 28 INCHES PRICE ONLY $1.50 program of inter- Per in. or Per est to the public. Range t,000 miles. Fraction Ft. Add 2 shipping weight one pound. Louisville, Ky. Monday, Wednesday, Fri- 3 and 3/ in. diameter 3l. c 30c day, I and 4 a in. diameter 4c 35c Get it at your dealer or send to P. M. 200 meters. Station of 5 in. diameter 4/e 42c direct to us. Darrell Ashton Downard. Call letters -Ws. and 6 in. diameter be 50e 9ARU. Police news in code. 2/, 3, 3/, 4 in. diameter have in. wail: Sold on a / satisfaction or money Madison, 434, 5 and G in. diameter have 5/3.2 in. wall back guarantee. Wisconsin. Daily except Sunday, Postage extra; 12.35 P. M., shipping weight 1 lb. per ft. Central Standard Time. Boo NO stamps accepted Dealers-Jobbers-Manufacturers: meters. University of Wisconsin station. on orders. Write immediately for attractive Call letters 9XM. Weather Dealers Write for Discounts proposition. forecast for Wisconsin. In International Morse Code, MICHIGAN RADIO CO. 18 words per minute. Repeated at 7 KLOSNER IMPROVED (Formerly Jeffery, Crawford Co.) words per minute. Then repeated by 2173 Hiliger Ave. Detroit, Mich. APPARATUS CO. voice from radio telephone three times. DEPT. N Daily except Sunday, 12.15 P. M. Same station and wave- 2404 Crotona Ave., New length. Report York City of Wisconsin Department of Markets. Same code, to words per minute. Spe- BAKELITE cial abbreviations are used. Persons interested should secure from the Univer- sity Forms MI -2o and MI -22. Report; are repeated by voice from radio tele- RADIO PARTS MAGNET phone, using same abbreviations, begin- WIRE ning Quality guaranteed. Each spool contains 12.50 P. M. Moulded To Your Design one continuous piece. Ready for ship- Friday, 7.30 P. M. Same station and ment within 24 hours. wave- length. Edison phonograph music. PER %y LB. SPOOL At 8.15 P. M., wave- length is Size Enamel Single changed to Northern Industrial Chemical Co. Double 375 for Cotton Cotton meters the benefit of those whose 11 Elkins St. No. 20 .29 .37 .40 receivers will not receive Boston, Mass. No. 22 .31 .38 .44 the longer No. 24 .33 .44 .49 waves. Concerts given in the Univer- No. 26 .35 .50 .56 sity Armory by Moulders of Electrical No. 28 .40 .62 .70 distinguished artists Insulation No. 30 .42 .75 .60 such as Vecsey, Lhevinne and Casals are Larger quantities at proportionate prices. transmitted by radio telephone in place Shipped prepaid to any part of U. S. An of the phonograph concerts whenever order will entitle you to have your name the placed on our mailing list to receive monthly consent of the artists is obtained. bulletin of specially priced Radio aid'Elec- Monday, g to 11.30 P. M. 375 meters. Agents Wanted trical Supplies. Same station. Campus news exchange Slake extra money during your spare time by repre- with other Universities. International senting 'our publications in your town. Write us Newco Radio today regarding our special bonus offer. & Electric Supply Co. Morse Code, 20 words per minute. STRATFORD, CONN. Experimenter Publishing Tuesday, Thursday, Io to 12 P. M. Co. Same station. 330 meters Exchange of 233 Fulton St. New York. N. Y.

www.americanradiohistory.com 887 Raato News jo, Plarch, 1922

; 4 / - ,. ,. ,. - ;; . ,e.i :o, :í/ "+ / - r

-in home sets or amateur stations- -tubes which This A -P heard across Combination It is well known to the radio art that no tube the Atlantic can be both an amplifier and an efficient detector of spark signals. Only a combination of tubes With A -P tubes Paul Y. Godley, Ameri- can g. ve complete efficiency. Re eml,ir that, can radio engineer, recently succeeded in and when buying tubes insist on the .b -P Com- receiving radio messages in England across bination here iIlustiated. re- In this A -l' combination the Atlantic from the U. S. After the efficiency of neither A -P Co.: tube is decreased by turning to America he wired the trying to make it per - foan' the ftutclLions of the other, but each is highly spec' alized and to per- THE A -P VT fully developed THE A -P Godley's Telegram AMPLIFIER form in its own capac- ELECTRON ty, the two operating to- RELAY OSCILLATOR a used by gether, thus providing -the most sensitive de- "Yottr (A -P) tubes used EXCLUSll'ELY in --the Amplifier higher efficiency than tector of spark signals the U. S. Navy. "Use can possibly be accom- radio art. with excellent result tubes se- tube the Navy uses.' known to the superheterodyne the rlishecl by any one tube Price $5.00. and carried on Price $0.50. or in any other way. lected on this side remained intact under EeForest entire procedure also used your A -P Tubes ere lin'nsed by the Radio Corporation of America throughout for amateur and experanaental use in Radio tom- A 11(io9( II n,l Fleming patents (A -P) tube as detector with this outfit" ORDER FROM YOUR DEALER OR DIRECT FROM (Signed) GODLEY. Atlantic Pacific Radio Supplies Company A -P TUBES FOR EFFICIENCY 638 MISSION STREET, SAN FRANCISCO, CALIFORNIA USE HENRY M. SHAW, President Eastern Office: 5 Kirk Place, Newark, N. J. National Distributors for the Moorhead Laboratories, Inc.

v //'e. Ja1í.Lz?, vV`>`.:`\J

OF PEN N SI L,- NIA INC.

U. S. Eagle Galena PRICE EACH 25 CENTS Radio Reception by the Marvelous Crystals of Sensitivity ; Improve your use of this Crystal. No better Galena on the American market. Each Crystal be- is packed in a tin container, labeled U. S. Eagle Galena, the galena itself ing wrapped in tin foil and packed in cotton. DEALERS: Write for our proposition and catalogue, listing all popular makes of Apparatus. "If it is anything in Radio, we have it." U. S. RADIO CO. OF PENNA., Inc. Manufacturers, Distributors and Importers Corner Ferry and Diamond Sts. Pittsburgh, Pa., U. S. A.

www.americanradiohistory.com 888 Radio News for 111 árcda, 1922 messages with amateurs. 3 Friday, g to 12 P. M. Same station. 375 meters. Messages and tests. Speed adapted to amateurs. Medford you need a good look- Hillside, Mass., Daily, 8 P. M. 35o meters. Station of American G-W Radio ing knob for rheostat and Research Corporation. Call letters \\- or control try GI, Boston city police reports, first in If International Morse Code, ten words per SLIDERS minute, then by radio telephone. and RODS Wednesday, 8.15 P. M. Same station. A new quality product Concert. neatly made G.A.Indicating Knobs Tuesday and Thursday, 8.15 P. M. Same station. Burgess Bed Time Stories. Thousands on hand Monday, 8.15 P. M. Exactly the same shape as the Same station. for immediate Publicity and information of general in- G. A. LOCKED SWITCH terest. shipment KNOB, the indicating knob has a white line engraved into the Friday, 8 P. M. Amateur Night. Code N" Slider instruction; new licenses flange to work against one or announced. 30c more lines on the panel. Made Saturday, 8. 15 P. M. Football, base- ea. ball, for or % inch shafts. With other sporting events and general 3/16" Slider his knob and the G. A. STAND- news. 25e ARDIZED switches and dials you Special broadcasts. Same ea. have station. a complete, systematically United States Public Health Service Lec- designed set of controls. You can tures. Detailed reports Trade Mark Registered Mail Orders promptly of World Series. DEALERS: get a 6 -ohm rheostat for receiving Concerts by high class artists. U. O. Patent Office. - tunes, Sermons (Patent Pending.) Write for proposition. fitted with a G. A. INDI- on Sundays. Addressed by prominent Distributors Wanted. CATING KNOB for $1.15, a speakers. Business reports. Voices Carried in stock by the following distrtb- 2 -ohm, 6- ampere rheostat at $1.50. from this station are utors or on the heard in Indiana, INDICATING KNOB North Carolina, Canada, Ship Owners Radio Service, Inc., a lone Texas, and on 80 Washington board ships in the Atlantic. St., New York City Radio Distributing Co., Menominee, Michigan. 4 The Price is Reported by Sig- West Park St., Newark, N. J. nal Electric Manufacturing Company Economy Auto Supply Co., that they hear all broadcasts sent out 268 Halsey St., Newara, N. J. 40c with sufficient power to carry up to 800 GEHMAN & WEINERT Postage 3c or i,000 miles. 42 WALNUT ST. NEWARK, N. Montreal, Canada. Tuesday, 8 to 9.30 P. J. M. 1,200 meters. Station of the Mar- 88 -N coni Telegraph Company of Canada, The Park Place FOR BEST-RESULTS General New York City Limited. Radiophone concerts, news bul- USE letins, Storage D Batteries, good grade, 22í/z V $2.78 Send 10e for the new notices of wireless society meet- Electrolytic rectifier for charging above 1,00 PA Apparatus CompanyY J G. A. Catalog ings and other information. Range FORMICA PANELS about 3/16" cut to size, per sq. in 02 200 miles. Heard at Charlottetown, DRILLING and ENGRAVING we lay out and Prince Edward Island. drill holes any size up to 3/a" for 20 each, and from 1/2" to 1" at and 4c each. Letters Newark, New Jersey. Radio telephone figures engraved at 4c each, 130 scale at 65e broadcasts and each, arrow at 25c each. IMMEDIATE DELIVERY all sorts of traffic too MAGNET WIRE numerous to mention. Wireless Equip- Best grade, lowest prides, per / lb B. & S. gauge knew. L.C.C. D.S.C. ment Company reports hearing amateur No. 22 $0.44 $0.73 Cardboard Tubes, Seamless, Gray, -inch No. $1.00 wall, 2/x12, 25c; / Radio telephones in New York, Perth 24 .50 .83 1.20 3x12, 30e; 3/x12, 35c; No. 26 .60 .93 1.40 4x12, 40e; 4/x12, 45e; 5x12, 50e; 6x12, 60e, Amboy and Rutherford. Also Westing- AERIAL WIRE house station WJZ, Army radio tele- 7 No. 22 bard drawn copper, stranded, per 100 Contact Points, Nickeled 6 for 30e phones at Fort feet $0.75 Contact Points, Brass 6 for 25c Wood, N. Y., and the De Send for free catalogue Stops, Nickeled 2 for 10e Forest Radio Telephone and Telegraph HUGHES ENGINEERING CO. Phone Binding Posts, Nickeled, each....15c Company's broadcasts. P. O. Box 57, TERRACE PARK, OHIO Binding Posts, H.R. Top, Nickeled, each.lOc The Binding Posts, H.R, Top, Nickeled, each.15c Westinghouse Company's radio telephone broadcasting station in New- BRASS RODS, POLISHED and DRILLED ark is one of the most powerful in the BRASS country and, like this rx 7....15c %x 7....20e SLIDERS company's stations lr Storage x 9....15c %x 9....20e tá 25c in Springfield, Mass., Pittsburgh, and 4x13....20c /x13....25c / 30e Chicago, provides varied entertainment Batteries for all who listen in during the day and for Radio MAGNET WIRE evening. With proper receiving appar- Price pez lb. 5/4 lb, lb. / / / lb, / lb. % lb atus Westinghouse Broadcasts may be Work Double _ Double heard over practically the entire Eastern A good, dependable battery B. &S, Ga. Enameled Cotton at moderate Silk United moderare cost, bud, in No. 18 $.75 States and the addition of multi- iivery deals ofthe bet at. No. 20 enals obtainable. $,60 $.30 .80 $.40 $1.00 $.50 stage amplifiers and loud speakers will 6 V., 40 No. 22 .65 .35 A $ 10 .85 .45 1.05 .55 make the music, 6 V., 60 A $ 12 Quaranteed for One yea, No. 23 sermons and other things .70 .40 ,90 .50 1.10 .60 6 V., 100 A $ Distributors No. 24 .70 audible throughout the largest auditor- 16 .40 .90 .50 1.10 .60 6V,120 A H. ï is Wanted No. 25 .75 .45 .95 .55 1.15 .65 ium. No, 26 .75 .45 .95 ,55 1.15 .65 Bridgeport Storage New York City. A list of all that Battery Company No. 28 .80 .50 1.00 .60 1.20 .70 can be 235 Remington Street. Bridgeport. Conn No. 30 .85 .55 1,05 .65 1.25 .75 heard with a radio receiver anywhere within three hundred miles of Greater Prices net; parcel host Prepaid anywhere in New York U. S. Send for our catalog FREE. would fill a book. At any C. W. APPARATUS OF ALL KINDS hour of the day of` night, with any type Detector and One -step Amplifier in of apparatus, cabinets $35,00 adjusted to receive waves C.W. Chemical Rectifiers, complete, THE KING RADIO CO. of any length, the listener will hear some- 500 mill -amp. Cap. 14 jars, will thing of interest. Scores of ships may handle / amp. at 1,000 volts or less Century Bldg., PITTSBURGH, PA. be heard exchanging In cabinets 9.50 messages with shore Prompt shipment stations or with each other in the Inter- JONES ELEC. & RADIO MFG. CO. national Morse Code, Many of them 120 E. Lexington St. Baltimore, Md. have radio telephones also and conver- Remember the name sations may be heard in many different EASTON BETHLEHEM ALLENTOWN languages. Government stations send - - FEDERAL out third, second, eight, and all other districts. We have weather forecasts, hydrographic informa- the largest atock of wireless apparatus in this when in need of and carry section tion and time signals. complete lines of FEDERAL, - Radio Corp., Amateurs signal ACME, Murdock, NADA, Chelsea, and all other re- FIERE in Morse code, converse over radio tele- liable manufactures. Send ten cents for large cata- Sheets, Rods. Tobes. Special Pieces. eto. Also, phones or amuse the log. Phone or mail your order fer prompt delivery. Paper and Cardboard Tubes world by playing Listen for our radio phone, Call 51.1. jazz. At times there is so much going LEHIGH RADIO CO. A. F. Bredseh, FEDERAL FIBRE CO. Wilmington, Del. Center Mgr. on that it is difficult to tune out all but & Fairview St. BETHLEHEM, PA.

www.americanradiohistory.com Raain N cuus for March, 1922 889

WHEN SOU SPEAK OF "B" BATTERIES BE SURE YOU SEE THE A CE OF SPADES "It is Your Only Satisfaction"

We beg to advise the many admirers of the Ace 45 Volt variable Iattery that we are the originators of this type. We had experimented several months before introducing this battery and know how to compound the ingredients to assure onger life and better "B" Battery Service. But re- membe, that unless you see the "ACE" you are not getting the original and genuine.

Size 6"1 x 5" x 2% ". Weight 3% lb. Price $3.50

And now we want to tell you about our 4% Volt Block Battery. This "ACE" powerful unit is the real thing for boosting your weak `B" Battery. Five units connected together constitute one Navy size 22% Volt "B" Battery. Ace manufactures a Type Battery to meet any `B" Battery requirements and absolutely guaranteed. Ace Quality is Supreme and Within the price of Everybody's Pocket. No Radio Set Complete Without Ace "B" Batteries. first class radio dealers. Write for Catalogs. Ace Batteries are for sale by dl Size 4 "x3 "xI %" Weight r lb. ACE BATTERY MFG. CO., 264 Atlantic Ave., Brooklyn, N. Y. Price $o.5o

Wireless Course in 20 Lessons

By S. Gernsback, A. Lescarboura and H. W. Secor, E.E. BEACON MARCH RADIO SPECIALS (11th Edition) For those radioìsts who take pride in assembling their own sets, we list below some of the parts we have in stock NOW, ready for immediate shipment. Order right from this A Course that tells you everything you want to advertisement. Appreciation must be made of course that space allows only a 1.mited amount .know about "Wireless," starting off in lesson of stock to he listed. Therefore if you desire something not listed, write for sauce and we I-IAVE No. 1 by explaining the Principles of Electricity. if it is to be had, IT. By simple, easy stages, this won-

5l gm 1 Grid into II Condenser derful Course takes you Ingi Phone Condenser I \Vireless" by the use of such F r+o.c.tr .0000 M. F EEArON 110 8 ELEC. CO. BEACON RADIO & EtEC Co. s Mir YOM nn ihNO simple language so skillfully used Uo1 I s R DIO Et ,:;'i ' that of necessity you must understand every word. There is a CONDENSERS- Reproductions are two -th rds actual size. 35 cents whole lesson devoted to the The- each. Grid leak condensers 50 cents each. ory and Mathematics of this epoch making subject. The last lesson DIALS -Newest idea in dials for amateur CABINETS-Best grade cabinets for the is devoted to a history of Wire- use. Same as those used by the U. S. Navy. practical radioist who wants the best and yet less. Anti -capacity. Vario- coupler, 3 in. diameter, reasonably priced. Ours are made of solid This Course has been considera- $1.25. Varionteter to match, 4 in. diameter, oak, wax finished. Sizes: bly revised in order that it meet $1.40. some of the many important 7 x 7 $2.00 changes which have occurred in BAKELITE- Insist on Grade XX bakelite 7 x 12 2.50 Radio Telegraphy and Telephony dialecto for your set, 3/16 in thick and cut 6 x 14 2.50 within recent years. Much valua- to any size. Price $2.25 per pound. Order 8 x 10 3.00 ble data and illustrations concern- any size you require and same will be for- 7 x 18 3.50 ing the Vacuum Tube has been warded immediately. Any of the above with hinged top, added. This comprises the theory 50e additional. of the Tube as a detector and as an amplifier, and in addition has TUBING- Spaghetti Tubing for efficiency as well as good appearance is just what you need to add the final touch to your set. Comes in been included modern amplifica- lengths cents length. tion circuits of practical worth. either black or yellow in 2/ ft. -18 per Incidentally, space has also been devoted to the development of the Radio Compass as operated and controlled by the United States Navy with Beacon Radio and Electric Company its consequent great aid to present-day navigation. 246 Greenwich Street New York City Size of book is 7 x 10% in., 160 pages, 350 NEAR PARK PLACE illustrations, 30 tables.

"wireless Course In Twenty Lessons" Cloth bound in Vellum de Luxe, stiff covers, sewed, gold stamped, each, prepaid $1.75 hand- Agents Wanted NEGTICUT Make extra money during your spare time by repre- The Experimenter Publishing Co. s vting our publications in year town. Write us RADIO EQUIPMENT Incorporated today regarding our special bonus offer. Variable Condensers, Transmit- ters, Head Bands, Panel 236 -A Fulton Street Experimenter Publishing Co. Switches, Etc. 233 Fulton St. New York, N. Y. NEW YOP' Connecticut Tel. & Elec. Co., Meriden, Conn.

www.americanradiohistory.com 890 Radio Ncws for March, 1922

THE LEADERS

,,,",: HOW TO BUILD THE RADIOTROLA dale4 Dim x mä.;Áì{* 5r 3Çfssi,,x.,.istiç- E' 20 Cents RADIO February RADIO CONCERTS 1922 IN THE HOME NEWS Ow In Mustr,r5,t rte , . LL, <<.ss M6,1.1.

104 Pages 65 Articles 195 Illustrations 16 Pages Rotogravure 120 Pages 48 Pages 5o Articles 100 Articles 100 Illustrations loo Illustrations 16 Pages Rotogravure On all Newsstands 25c. On all Newsstands the copy On all Newsstands 25c. Subscription per Year 20C. the copy the copy $2.50 Subscription per Year (Add 5oc. outside U. S.) Subscription per Year $2.00 (Add 5oc. outside U. S.) $2.50 (Add Soc. outside U. S.) Exclusive Radio Articles Edited by a Special Circulation larger than all other Feature H. Gernsback Radio Magazines combined. and Present Issue Professor O'Conor Sloane 105,000 Copies "The Undisputed Authority on Simplified Science and "The loo Per Cent. "Electrical Progress in Wireless Magazine." Mechanics." Plain English."

Experimenter Publishing Co., 236 Fulton St., New York. Enclosed find $ for which enter my subscriptionfor one year (12 numbers) to J Radio News E Science & Invention n practical Electrics. Special Combination Offer: All Three Magazines, $5.25. Add $1.50 cutside U. S. Name Address

Town State

www.americanradiohistory.com Radii News for Munch, 19x2 891

tile station that the hearer wishes to receive, though the selectivity of modern tuning apparatus is marvelous. By merely listening in and writing down the ad- Here's A Receiving Set justment of the receiving apparatus at the time when it brings in each station, anyone may quickly develop a list of That Is Guaranteed broadcasts and then add to it each day as new and interesting stations are discov- - The Clapp - Eastham, ered. Type HR Regenerative One man reports : "I can hear nearly every high power station in the world." Receiver. Paris, Texas. Daily, 7 P. M. 375 meters. Station of James L. Autry, Junior, Hous- And the price is only ton, Texas. Call letters 5ZX. Weather forecast and local news. International $35. Morse Code. Daily, 7 P. M. 375 meters. Dallas, It's an easy thing to find a set that Texas, station. Call letters 5ZC. costs more money, but we'll guarantee Weather f or e cas t, highway report that no matter what price you pay, you (CAMAA), police bulletin and local can't get a set that gives better, more news. Code. satisfactory results. No schedule given. 375 meters. State Tuning is as easy as setting the hands University, Austin, Texas. Results of of a watch, and the distance at which athletic contests, local news and other in- signals are received and the sharpness formation. Call letters 5ZU. Code. and loudness of tones is almost beyond Daily, 7.30 P. M. 450 meters. Dallas, belief. Regeneration is perfect on all Texas, station. Call letters WRR. wave lengths between 180 and 825 Police and Fire Departments. Weather meters. Antenna Condenser built as a forecast, police bulletins, local news and vernier. "B" Battery may be placed in other information. Radio telephone. compartment inside cabinet or external used. Daily, 8.3o to 9 p. m. Same station. Licensed under Armstrong U. Et Patent, No. 1,113,149. "B" Battery may be Concerts. The experienced radio man will appreciate the quality indicated by these specifications: Daily, 6 P. M., until II or 12 P. M. Panel- Condensite, handsomely finished Oak, oil finish 375 meters. Denver, Colorado, station. Cabinet-Dark Vernier local news. Condenser - Balanced type, 2 Rotary, 3 Stationary plates, Built on Addresses, music and Dials- Indestructible metal. White figures on black ground At intervals. California stations. Col- Antenna Inductance -Wound on Formica Tube stations in New York, Michigan, Plate Inductance -Wound on molded ball lege Binding Posts-Nickel-Plated brass Wisconsin, Nebraska, Ohio, Illinois, Switch -Fan Blade Iowa, Dakotas, Indiana, Missouri, Rheostat -C.E. Type H 400 Georgia, Texas, New Mexico, Kansas, Circuit -Single circuit regenerative. Licensed under Armstrong U. S. Patent No. 1113149 Mississippi, Louisiana, Alabama, Vir- "B" Battery- Contained in compartment inside cabinet or external as desired. ginia, Kentucky. All the above were reported by A. L. If you're looking for the most efficient receiver that can be obtained at any price. Overstreet. ask your dealer to show you the C -E Type -or write us direct. Pittsburgh, Pa., Daily, 8 P. M. 36o meters. equally interesting items and it covers Catalog. Each of its three parts describes Westinghouse Station. Varied program. Send 6c in stamps for a complete Radioevery radio essential from the smallest to Doubleday -Hill Electric Co. 450 meters. the largest item. Range 70o miles. Schedule to be announced. San Francisco, Cal. Leo J. Meyberg Company reports the following concert CLAPP-EASTHAM COMPANY schedule: RADIO ENGINEERS and MANUFACTURERS, Sunday, Io to II A. M., Fairmont Hotel station. 120 Main Street CAMBRIDGE, MASS. Monday, 7 to 9 P. M., Presidio station. California Representative: AND LOS ANGELES 127 -19 Monday, 7. 30 to 8.30 P. M., Los Altos LEO O. MEYBERG CO SAN FRANCISCO station. LISTENING TO THE WORLD'S GRAND OPERA With TRESCO TUNERS- "They made their way by the way the're made for city or country home, cheaper than a phonograph" TRESCO SUPER -UNIVERSAL TUNER

Cabinet I2 x 171/2 inches, Formica or Hard Rubber Panel. Weight 15 lbs.; shipping 25 lbs: Wave length range, 150 -25,000 M, Tuners inside- three, AC. BS, KS. Recommended by users of the Bureau of Market Reports and guaranteed to get all the wireless signals, either Cw, spark, or telephone within the range of the sending station. This is the only tuner in the world that has this range of leave lengths and gets the signals on the smallest possible single wire aerial. Arlington time, Annapolis, San Diego signals clearly re-ad through even a violent thunder storm. Nearly all stations in the United Estates of the Bureau of - Markets come in on this tuner in the center of the United States, and no point in the country would prevent the reception of these signals. It is recommended for the Farmer, Bureau of Markets, Schools, Colleges, etc. There is nothing about it to get out of orier or need replacing except the high voltage batteries, a replacement of which costs only a few dollars. We ship only by express. We do not ship without testing and calibrating with your bulb, and each one is absolutely guaranteed to do lust as we claim or we will refund your money. You do not need to know anything about wireless to operate this tuner or to get the signals and telephone reports. Cabinet is highly polished and all parts nickte finish. If you wish extra loud signals you may use one or two step amplifier, as posts are provided on the tuner for this purpose. We recommend Baldwin or Brown phones. We only sell this toner osemtled and calibrated to your bulb ordered with the set. It is complete with all that is needed except a pair of phones and a few dry cells to light the filament of the Audios. Reach to use when it arrives with full directions so that a child can operate it. Priced at $100.00, F. O. B. factory. COMPLETE TUNERS FOR MUSIC -ONLY $60.00. Licensed under Armstrong Patent No, 1113149. 10e brings Our Catalog. TRESCO - DAVENPORT - IOWA

` Subscribe to R dio News -$2.50 a year. Insure your copy reaching you each month. Experimenter Publishing Co., 236-A Fulton St. .N.Y.C.

www.americanradiohistory.com 892 Radici News par March, 1922

CT f4- ELECTRO- Instruction (soak x.,rr A TREATISE ON ELESEWTARY ELECTRICITY l 100 Electrical Expermeeab TO y..wrus.ssn xm a The "g4r Nog Electric gaps" 3 lectrir. sys BOY'S

cTRO IAIMPOR NG CO. ELECTRIC CMIC TOYS As Shown Teacnet you all the prime' pies of electricity by the "Learn by Doing" Method. Entertaining, Instruct., More $Z.50 Fascinating than any game M aad Ftocacs The most complete electrical a nrcüm Plan experimenters' outfit that has Complete ever been put on the market. 'R

n. CANCER C¢ ei_Me.on á /'I Valuable Electrical Instruction Book With Each Outfit With each outfit we furnish free a very corn prehensi -e book of electrical instruction. All BA7NLIA,A00 EucTPKLuxr (It crirc Peso vLUY the fundamentals of this fascinating science are clearly explained so even a layman can understa -id every word. Profusely illustrated The instructions for building the apparatus are given in such a simple and easily grasped manner that anyone can make them without the least trouble. Over a hundred experiments that can be performed with the outfit are listed in the instruction book, nearly all of them illustrated with superb drawings.

11111111111 INIMBI A Sample of What You Can Do With This Outfit This illustration, made from an actual photograph, shows enly a very few of the many instruments that can be made with the Boy's Eleetri Teaches You How To Toys: Electric Pen d u l u m, Electri, Build Electrical Apparatus Telegraph, Current Generator, Electrlr THE BOY 'S ELECTRIC TOYS' contains enough material to make Dancing Spire, and complete over twenty -five different electrical apparatus Galvanometer without any other tools, except a screwdriver furnished with the outfit. Tke box contains the following complete instruments and apparatus which are already assembled - Student's chromic plunge battery, compass -galvanometer. solenoid. telephone receiver. electric lamp Enough various parts. wire. etc. are furnished to make the following apparatus: Electromagnet, electric cannon. magnetic pictures, dancing spiral, electric hammer, galvanometer, voltmeter, hook for telephone receiver, condenser, sensitive microphone, short distance wireless telephone, The outfit contains 114 separate pieces of material and 24 pieces test storage battery. shocking coil, complete of finished articles telegraph set, electric riveting machine, electric buzzer, dancing ready to use at once. fishes, singing telephone, mysterious Among the finished material are included: Chromic salts, lamp dancing man, electric jump- socket, mercury, core wire, iron fillings, three spools of wire, ing jack, magnetic geometric figures. rheostat, erratic pendulum, carbons, machine screws, flexible cord, wood bases, glass plate, electric butterfly, thermo electric motor, visual telegraph, etc., etc. paraffin paper, binding- posts, screw-driver etc. etc Shipment guaranteed within 24 hours, ELECTRO IMPORTING CO. l 231 Fulton St., N. Y. As per your advertisement, ship to me at once, C.O.D., SEND NO the Boy's Electric Toys with privilege of inspection. It 1s MONEY understood do not like outfit T We have so much that if I the can refuse it confidence fin this set that we desire to ship it to yen C. O. D. with the privilege of inspection. It does not cost you one cent to take a good look at the outfit, and see if it comes up Name If does, ea,v to your expeetatlone it the postman $7.50. plus shipping charges It It does het. you need not accept it. and we will pay the return charges as well. Address

THE ELECTRO IMPORTING CO. City State 1 231 Fulton St., N. Y. City ! (PEN 3-22)

www.americanradiohistory.com Iculy News for March, z922 893

Monday, 8.3o to 9 P. M., Fairmont Hotel station. Tuesday, 7.30 to 8.15 P. M., Hotel Oak- land station. Tuesday, 8.15 to 9 P. M., Radio Shop station, Sunnyvale. Wednesday, 7.30 to 8.15 P. M., Harrold Laboratories, San Jose. EQUIPÌE N T Thursday, 7.30 to 8.30 P. M., Fairmont Hotel station. Thursday, 8.30 to 9 P. M., Los Altos station. Friday, 7.30 to 8.15 P. M., Radio Shop HIGHLY EFFICIhNT I station, Sunnyvale. Friday, 8.15 to 9 P. M., Hotel Oakland station. s H o R T ° w A v = Saturday, 8.15 to 9 P, M., Fairmont Hotel station. Every afternoon except Sunday, 3.3o RADI O RECEPTION to 4.3o P. M., Rockridge station of At- lantic- Pacific Radio Supplies Company. 36o meters. Call letters KZY. Concert. Every night except Sunday, 6.45 to 7 P. M. Same station. General news, sports, foreign news. Sunday, 11 A. M. to 12.15 P. M., sermon and sacred music. Same station. ** 3 to 4 P. M., Same station. Concert. 4 to 5 P. M., Same station. Concert ** * *This station will carry the Sunday morning schedule of Trinity Center and the Sunday afternoon schedule of Colin B. Kennedy until these two stations are An unsurpassed combination -the Kennedy ready to carry their schedules shown for Type 281 Receiver with the Type 521 Amplifier. that day. Wednesday, 7.30 to 8.15 P. M. Same 1'75 620 the Kennedy Type station. Concert. WITH a tuning range of to meters, Saturday, 8.15 to g P. M. Same sta- 281 Short -Wave Regenerative Receiver is designed for extremely tion. Concert. effective reception over a range of wave lengths which includes those Also the following, daily except Sun- used by the regular and special amateur stations and by the nu- day: merous broadcasting stations throughout the country. 7.10 to 7.20 P. M., Hotel Oakland station. General news. AS illustrated above, this receiver may be connected to our 7.20 to 7.30 .P. M., Fairmont Hotel Amplifier. This amplifier station. Market, bond, and weather re- Type 521 Two -Stage Audio Frequency ports. was designed especially to be used with the Type 281 Receiver when 4.30 to 5.30, Fairmont Hotel station. amplification of signals at audio frequencies is desired ; consequently Until the California Theatre can make the ensemble is harmonious both as to appearance and performance. the necessary changes to operate on 36o meters, the Presidio will broadcast con- KENNEDY EQUIPMENT has established for itself an envi- certs on their schedule, Wednesday even- able reputation in which QUALITY and VALUE are the out- ings, 8.15 to 9, and the Fairmont Hotel Our trade -mark is your assurance of un- full hour and a half from standing characteristics. will run the questioned superiority in design, workmanship and performance. " 7.30 to 9 P. M. on Saturdays. Hotel, Los Altos, Hotel The Fairmont 201 501 describing these units Oakland, and the Presidio are heard con- Write for Bulletins and sistently up to 1.500 miles. Reports have Co- All Kennedy regenerative receivers are licensed been received from Alaska, British under Armstrong U. S. Patent No. 1,113,149. lumbia, Washington, Oregon, Nevada, Utah, Arizona, Montana, North Dakota, and practically all of the Northwestern states. Stations within a radius of two THE e LI:® INCORPORATED and three hundred miles are consistently receiving concerts from the above men- RIATTO) 'BUÌLDIINGI SAN FRANCISCO tioned stations loudly enough to be heard all over the house,. Rumored that Westinghouse Company will establish broadcasting station similar to that at Newark N. J. AMATEURS St. Paul, Minnesota. It is reported that city officials, a Are You a Member of the Radio Exchange? through cooperation with of Used Radio Equipment. is The Radio Exchange is the meeting place of buyers and sellers Boy Scout Municipal Radio station want to pay, and sell what you don't want will be If you want to get what you want, at peces you being established. The station at prices you do want. then able to send by radio telegraph over a radius of 1,000 miles and by radio tele- JOIN THE RADIO EXCHANGE high as 500 miles. It will dis- phone as Upon receipt of 25e we will mail you a membership card with full details regarding our tribute crop and weather reports and co- plan, along with a catalog of prices on all standard makes of New apparatus. The prices operate with the State Department of in this catalog are incomparable, and are for the use of members only. This catalog alone membership fee, so if you really want to save money, Forestry by reporting forest fires. Inter - is worth many times the small troop communication will be maintained JOIN NOW between Scouts in all parts of the State. EXCHANGE addresses given at THE RADIO Concerts, lectures and 804 HELEN STREET SIOUX CITY, IOWA the Municipal Auditorium will be broadcasted. The station is reported to be in charge of 16 Scouts under the leadership of a Scoutmaster who was formerly a MONEY FOR YOU -Add to your salary -Make extra pin money -Start a lucrative business of your own. Spend an hour each day taking subscriptions for the Radio News. We'll radio inspector. pay you well and you'll enjoy the work. Write for full particulars. Circulation Dept., Schenectady, N. Y. Union College broad- Radio News, 236A Fulton Street, New York City. casts programs of interest to public.

www.americanradiohistory.com 894 Radio News for March, t92.

Seattle, Wash. Post- intelligencer broad MEMORIZE casts programs of interest to public, including United States Public Health Ser CONTINENTAL CODE vice Lectures. ALMOST INSTANTLY Toronto, Canada. Tuesday, 8 to 9.3o P. M. 1,200 meters. Station of the Marconi -"As handy as a pair of BKUMA YRLSBUG Telegraph Company of Canada, Limited Radiophone concerts, news bulletins, no- 'Red Devil" Pliers!" Two Hundred Beginners in tices of wireless society meetings and HAT could Forty -Four States Have Report- other information. Range about 200 be more ed Mastered Code In 30 Minutes. miles. W practical In 45 Minutes. In One Hour, Washington, D. and handier to the One Evening, Etc., Etc , and C. Tuesdays, 7.30 to 9.30 P. M. Station of White & Boyer. amateur or profes- With Little Practice Obtained Con- sional License as Radio Operators. certs, with short lectures on radio and in- radio man formation than a pair of "Red Do not of interest to radio amateurs. be Satisfied to Limit the Planning to broadcast. Keith's vaude- Devil'. Slip joint Use of Your Radio Receiving Set ville, Pliers of forged to Periodical Broadcasts of steel? Tuesday, Music, Weather and Market 4.15 P. M. Naval Air Service For making delicate Reports, Etc. Station. Call letters NOF. i,loo meters adjustments a r o u n d Master Continental Music. United States Public Health spark gaps, etc. -for Code Service Lectures. cutting wire, and foi snit Understand _verything you may hear at keeping wireless sets any time tram anywhere. Eventually add a send- "tuned up" to the top ing net to your Wednesday, 9 P. M outflt. Get In touch with the Same station. 36c, notch of efficiency, a World. Talk Back, Ask and Answer. meters. Music. Talks on radio. pair of "Red Devil" Pliers fill a big need. Code Memorizing Records Friday, 8.30 P. M. Same station. Get a pair today -from all reliable MADE BY BEGINNERS Music. Music, 9 P. M., United States dealers, or from us, Mention WHO USED Public Health 70e. Dodge One Dollar Radio Service Lecture style 924 -6% inch. Sunday, 103o A.M. Church of the Write for r.'echanie's Tool booklet Short Cut Covenant. (Transmission by Radio Con- M I TH & HEMENWAY CO., Inc. AND PASSED GOVERNMENT struction Company. Call letters WDM. Monujaciurers of "Red Dee+l" Tools EXAMINATION 365 meters.) Church service. 273 Broadway, New York, N. Y W. A. Oettler, Woodhaven N. Y. Sunday, 3 P. M. Same church and Radio 2A0I 340 Woodland Ave. transmitting station. Addresses by fam- MIT Time required 30 minutes ous men and women on topics of public E. Gundrum Elizabeth, N. J. interest. Radio 2BXY 303 Cherry St. Time required one hour Sunday, 7.30 P. M. A New Service- Panels Cut to Order Same church and There is no need of using panels cut to make- Robert Gerbrick Philadelphia, Pa. transmitting station. Church service. shift sizes. We cut them exactly to the elze Radio 3BHP 2116 Hicks St. you require and they cost you no more. Time required less than two hours Some of the most important Govern- Bakelite Formica Fiber so. in, so. in sq. in. ment stations are located in the vicinity 1/16" 1/16" ..$.01.. 1/16" ..$0034 Mrs. Julia Garrett Fort Worth, Tex. ..b013á 24" of Washington. 34" .0234 iá" . .02 . .01 Radio 5PJ 303 So. Jennings Ave. The Arlington station 3/16 ...O33á 3/16" ...O23í 3/16" ...0114 Time required odd moments ten days of the Navy, call letters NAA, transmits %; time signals .....37 %" .....05 " .....03 J. E. Farquhar Hamilton, Ont. and news on 2,65o meters 44 Radio 3DW Canada 18 Albert St, daily at noon and Io P. M. This station DRILLING" Time required one hour and half We drill holes to your specifications up to 34- and the still more powerful one at An- ín diameter at a price of 3c each. Thos, F. Baird Preston, Ont. napolis, which transmits similar informa- ENGRAVING Radio 31IL Canada P. O. Box 78 tion on the same We engrave letters or figures to your specifica- Time required less than one hour schedule, can be heard tions at 5c each, 180 scale at 75e each, arrow throughout the United States and in fact at 30e each. Postage 15e on any size panel. David E. Day WINSTON SALEM, N. C. throughout a large WIRELESS CATALOG Radio 4BM P. 0. Box 48 part of the world. sic in stamps or coin brings new 100 -page The station the loose -leaf catalog, giving all instruments needed Tinte required 46 minutes at Bureau of Standards for wireless receiving and sending sets; places conducts tests in which it has the coöper- you on mailing list to receive regular bulletins. Roland Richardson Oakland, Calif. keeping you posted on lat- Radio 6AVH 4258 Foothill Blvd, ation of many amateur stations. Then est developments in wire- Time required one hour there are Army stations less telegraph and tele- and stations con- phone. Write NOW. INVESTIGATE nected with the Army and Navy flying The Kuebler Radio FOR TEN fields. Radio telephones may be heard Co. RED STAMPS frequently. 23 Gibbs Bldg. will mail Booklet containing information Loomis Radio School is TOLEDO OHIO and Reports from 240 successfully self - planning to broadcast, daily, music played instructed beginners -many of them now in a local theatre. licensed operators. No Instruments needed with this method. Westerly, Rhode Island. Nightly. Whitall Entire necessary expense for Code instruc- Electric Company station. Music and tion One Dollar, and limited study of Dodge Short Cut. speech. The Westinghouse stations at Pitts- C. K. DODGE burgh, Newark, N. J., and Springfield, Box 200 MAMARONECK, N. Y. Massachusetts, are heard here. They transmit on 375 meters concerts, readings, sermons, and news. Schedules are given in reports from a number of preceding WE CARRY A FULL LINE of RADIO cities. BROOKLYNITES SUPPLIES AT SPECIAL PRICES American Radio and Research Radio Service V.T. Sockets $ ,80 Corpor- 002 -0005 M.F. Phone Condenser ,25 ation station, Medford Hillside, Massa- 002 -0005 M.F. Grid THEY'RE MAKING A HIT! Condensers .25 chusetts. See One 221/4 Volt B. Battery, Small ,90 schedule under "Medford RADIO BLUR PRINTS after a full range of proven VT hookups for 22'/ Volt B. Battery, Large 1.60 Hillside, Mass." sending and receiving. No. 14 Solid Copper Aerial Each diagram on a separate print, clearly out- Wire, 100 ft .60 lined. No mistakes with 7.22 Stranded Copper Aerial Wire, 100 Radio telephones on board these circuits and they ft. 1.00 vessels sail- are always at hand for quick reference. Just TITAN STORAGE BATTERIES ing along the coast are frequently heard right for mounting in cabinet. WESTERN ELECTRIC PRODUCT here. Complete set of 24 postpaid 61.00 6 Volt 40 -60 Either half set, sending or receiving .50 Amp. $14.00 Wall chart blue print 6 Volt 69 -80 Amp. 16.00 Anywhere in the United 6" 28" Continental Cede States. With an x .25 KENSINGTON RADIO SUPPLY CO. up -to -date long -wave receiver, it is pos- No stamps for more than 25e 4416 Eighteenth Ave. Brooklyn, N. Y. sible to get the news broadcasted by high THE PLAN BUREAU 1929Sinióúis"MCAVE. powered stations in the British Isles. Germany, France, Italy, Russia, Mexico. GALENA SILICON West Indies, South America, Hawaii RADIALL With the increase in power of transmit- Agents All three for 25 cents ting stations world-wide reception has be- Wanted Make Contact points, nickel plated. 2c each come possible. Radio Central the new extra money during your spare time by repre- Compo Binding Posts 8/32. 7c each senting our publications in your town. Write um commercial station today Write for Dealers Proposti on of the Radio Corpor- regarding our special bonus offer. ation of America, located at Rocky RADIALL ELECTRIC COMPANY Experimenter Publishing 253 Passaic : treet Passaic, N. .1. Point, Long Island, New York, has been Co. 233 Fulton St. heard in New Zealand, moor miles away New York. N. Y.

www.americanradiohistory.com Radio News tor March, I922 895

Radio in Porto Rico (Continued from page 829) Build Your Own and NZR. regeneration for all waves, 1 am using Tower undamped. Radio damped and Time signals are heard every day at 1 THINK of the benefits and pride you would enjoy by having a real you P. M. and at 2 P. M. and 10.55 P. M. radio tower right on your own grounds. Think how much better NAA, NBA and NAR. This could hear and how much further you could send. Think how your rep- from NSS, community! is a great benefit for me as I am a watch- utation as a radio operator would travel through your maker. All high power stations are copied You can now build a tower yourself from standard materials easily, and on favorable conditions, LCM which are all sold by your local dealers -build it from 40 to 100 and POZ are also copied. XDA speeds up feet high - economically and safely - from the easy -to- understand every night from g.00 P. M. sending press Hull blueprint plans that are as simple as A -B -C. in Spanish. We are one hour faster than make it, according to blueprint num- CORRECT PRINCIPLES To the 75 meridian. building bers- you can't go wrong. experimenting For years we have been operator who likes to make things, I have been working and heavy transmission towers for big building this tower will be real sport. Rico since 1914. At last, central stations all over the country. alone in Porto started a department OFFER hers and 1 ex- Now we have SPECIAL there are some amateurs to permit radio operatorì to have the offer, for future. It expe- As a special introductory pect to have a Club in the near benefit of our tower building a limited time we have reduced the have some gocd work with rience. At great expense we have prices of all Hull radio tower working is my wish to drafted simple, yet detailed archi- out- specially those in the 4th towers blueprint and erection diagram the amateurs, tects' blueprint plans for radio fits exactly 50 %: District. of seven popular heights. Every second amateur licensed in problem is properly covered-founda- 40 -ft. and 50-ft. Hull Tower Plans, I was the tions, weights, stresses, wind pres- regularly $ 4.00- special $2.00 was Mr. E. Ca- figure Porto Rico. The first sures, etc. You do not have to 60 -ft. and 70 -ft Hull Tower Plans, my assistant, who was taught by me. out any sizes or what to use. Every- regularly $ 7.00- special $3.50 muñas, thing is shown plainly, right down to building a spark set and a Radio- to bore the holes. 80-ft. and 90 -ft. Hull Tower Plans, I am where and what size regularly $10.00- special $5.00 phone set, using 3 -5 watt bulbs. MONEY in the con- YOU SAVE 100 -ft. Hull Radin Tower Plans - As I have been interested Our plans call for everything that regularly $12.00 -- special $6.00 struction of apparatus, I have not speeded is best for strength, yet cheapest to so I can copy only use; you waste no money on useless All orders filled promptly upon re- up much in the code, parts. And, of course, because you ceipt of money -order or draft; send about 15 words a minute. build the tower yourself it costs you letter registered if it contains curren- My experience in construction work is but a fraction of what you would pay cy. Select the size tower you want to one ready -made. build and order the plans now; get an intelligent amateur may construct for tower that ERECT everything ready to build your any kind of radio apparatus as efficient as SIMPLE TO this Spring. saving two -thirds in The erection of your tower is sim- any built by firms, plicity itself. No long, awkward,heavy s. W. HULL & COMPANY initial cost. pieces are used; everything is light, with my nearly strong and easy to handle. After cut- Steel Tower Specialists I hope to get amateurs to size and boring the set, in a few months. ting the pieces Qeneral Offices completed short wave holes, you start building up and up, Cleveland, Ohio merely bolting each piece into posi- 3729 Prospect Ave. tion. You number each piece as you Addres ; Department R Notes on High Power Quenched Spark Sets (Continued from page 809)

sometimes considerable,able, and can be reduced by proper insulation of the laminations. The best insulation of laminations is shellac as indicated by the following results obtained on a 5- K.V,.. Navy transformer at 500 cycles Insulation. Volts. Watts Loss, T. Irons shellacked 150 251 2. Irons paper insulated loose 150.2 273 3. Irons paper insulated tightened 147 295 4. Irons s i m p l y rusty. loose 150 298 5. Irons s i in p l y rusty tightened 150.1 332 The core is held together with wood braces and iron bolts. These iron bolts reach a considerable temperature due to hysteresis loss. Substituting brass bolts the temperature attained is only one -half and mostly due to heat conduction from the core temperature. BADN 0 TOWERS In a similar manner the losses in an external reactance wound with one heavy wire due to eddy currents is much greater than in a reactance wound with a cable of a number of small wires each insulated from each other. Furthermore, the cable is KILLOGH OFFERS easier to wind mechanically than the heavy wire. Thordarson Amplifying Transformer $4.00 The reactance in ohms of an external reactance can be found closely by. Ohms = K Chirad Knocked Down Short Wave Sets I0.00 X Turns' X solid section in square inches Marko 6 Volt bo mp. Hr. Storage Batt 14.40 (core), K being a constant for the shape of the core. Emco Variometers and Couplers 7.00 The maximum inductance per square inch King Amp -li -tone Horn 12.00 is found as volts times 45,00o divided by section in square inches times the turns. There is a limit to heating due to maximum DAVID KILLOCH CO. induction in the center of the coil and 57 Murray Street NEW YORK CITY should not be much greater than 20,000 C.G.S. lines per square inch for soo cycles. WRITE FOR CATALOG TO -DAY In a 20 -K.W. spark transmitter the volt-

www.americanradiohistory.com Radio News for March, r922

ages it the antenna circuit are nigh with a high antenna capacity which in this case was .004 MF. Even in the primary radio frequency circuit an arc can be drawn out THOSE "CHELSEA" 3' or 4' around the gap units. The trans STOP former secondary is protected by two -air core radio frequency choke coils. To be HISSING NOISES No. 50 effective these chokes should liave a fundamental wave- length approximately that of the NOW! transmitting wave- length and with a AMPLIFYING minimum of distributed capacity. The transformer secondary is also protected by With Burgess " B" Batteries! a ball gap, a third ball in the center and TRANSFORMER connected to ground. Transformers or this Operation to the Last Volt! size are usually oil cooled which in addition Absolute Battery Silence! adds to the safety factor of the insulation. Multi -stage Radio Frequency Tuning of the various circuits is first ac- and Audio -frequency Ampli- complished on low power, even as low as fication Made Easy! 5 K.W. on a 20 -K.W. transmitter, and after all circuits are adjusted the power may ne increased 25 to 5o per cent. above 20 K.W., Burgess °B" Batteries Do IL without any danger of overload. the equipment being designed to stand that additional load for short periods of 3o minutes. BURGESS BATTERY CO. MADISON, WIS. The Hall Air Jet Relay for Recording Radio Signals ( Continued Trani page 809) ,11,.111 13111111111111,111111111111111111331,1111111111111111111111111,1111, 111111111IIIIII:I.,,111111116` set. Amplifiers are not a necessity, providing a clear, readable signal of only average was designed for use with the strength is audible in the head receivers. present day models of vacuum The relay is, to a great extent tone select- tubes, and ive, and signals of equal intensity, which when so used pro- cannot be readily _differentiated by the ear, may be SPECIAL duces remarkable amplification. individually recorded, providing a reasonable difference in tone frequency ex- This Month Only with minimum noise. It is well ists between them. adapted for table mounting or The foregoing paragraph would indicate Postpaid $5.45 Postpaid may be panel mounted in any the relay to be an extremely sensitive de- position. Its high efficiency vice, and so it is. In marked contrast to COTOCO to- this inherent quality to detect the weak in- gether with its neat appearance coming currents of the radio signal, is its extreme ruggedness Variable Condenser and compactness, makes it a and ability to withstand abuse. After once having adjusted the air .00r mfd. completely assembled for predominating feature in any pressure feed, which is supplied by a minia- panel ture mounting, without knob and radio receiving Equipment. blower, to the incoming signal, f urther dial. Positively the most adjustment is unnecessary. rugged and efficient amateur condenser on the A remarkable and unusual test of this in- market. The above with 4" Somer- Immediate Delivery strument came about unexpectedly. During ville dial attached for 6.9o. Order a recent demonstration a relay, which was now before the supply is exhausted. operating, accidentally Price as shown, $4.50 was thrown from its WANTED reliable AMATEURS in support and dropped over three feet on to a every town to act as our representa- Unmounted $3.75 hardwood floor with sufficient impact to tives. Write for proposition. loosen the seams of the enclosing wood cab- Bulletins sent upon request inet of hard dovetail oak. The instrument We handle all standard makes of upon being replaced on the table, continued RADIO APPARATUS. Send Purchase from your dealer. If he YOUR order to the does not have it, send to us. to operate perfectly, without the necessity of a single adjustment or repairing of any part. This same instrument, without any American Radio Supply Co. CHELSEA RADIO CO. replacements other than a new cabinet, has 225 E. Market St. Wilkes -Barre, Pa. given over five hundred hours' service. and 150 Fifth St., Chelsea, Mass. shows no signs of usage. I $1.75 In the matter of replacements, the only LEARNERS SETS $1.75 1 parts would be the rubber diaphragm and With Code and Instructions the silver contacts, which would possibly require renewal every three thousand working hours. The up -keep cost would hardly average one dollar per year. The relay is a sound, operated device, with no electrical or magnetic amplifying I 60e BUZZERS 60e circuits. A small air jet inflates the rubber Hightone; silver contacts; tone adjust- diaphragm, on which the movable spring ments located on top. contact rests. Adjacent to the jet, is a " $1.50 SENDING Mica Grid Condenser and Grid Leak Mountings KEYS $1.50 standard telephone receiver, which is con- I All brass, lever type, bakelite base and From .00005 to .00025 MFD. $.60 nected to the radio receiving set. knob postpaid. Prom .0003 to .0005 MFD. .65 An in- all Mica Grid Condenser only .00005 to .00025 MTh .36 coming signal, audible in the receiver, is AJAX Mica Grid Condenser only .0003 to .0005 MFD .50 conveyed to the air jet, causing it to flare. ELECTRIC CO. Grid Leak Mounting only 25 LPalmer St. Cambridge, 38,, Masss.I Cups Dozen .2S which allows the diaphragm to deflate, Alum. Condenser Plates (Kohler Type) bringing the spring contact in touch with Rotor or Stator, each a stationary contact. This closes a local Spacer. %" a 1 /10" thick, dozen .08 "Aerial Wire" Spacers %" 1/1" thick, dozen .15 circuit of about six volts to which a tape Triple Con Mounting 5.00 recorder, bell, buzzer, or land line sounder Special 2 -Coil mounting with gears 3.50 may be 150 feet Plugs for mountings .50 connected. Upon cessation of the No. 14 copper wire, $1.00 100 Kindly add 5c for Postage. incoming signal, the air jet immediately re feet Stranded copper wire, $1.00 turns the diaphragm to its normal condition Empire Radio Equipment Co. MONTROSE MFG. CO. thus opening the local circuit. This 610 St. John's Piase BKLYN., N. Y. process 271 West 125th St New York City is repeated in response to each incoming dot

www.americanradiohistory.com Radio News tor March, 1922 or dash. It is very evident that this perfectly and speedily reproduces the original signal. It has been found that 12 -volt currents are readily handled directly by this PRODUCTS rugged set of contacts. For higher currents a four -ohm relay is first actuated and used "WORKRITE WORKRITE' as an intermediate circuit. One Western university nightly flashes government time signals from its administration building dome by means of a 1,000-watt lamp search- - light. This makes i; perfectly evident that distant mechanical devices may be started and controlled by radio signals.

Real Sport Playing Games by Wireless (Continued from page 825)

;1.11o.111.11.11,111111111111,,,11111111111,.,,.111111,11.,,111111111,111,,,,,,,,,,,11111111,1,11111,,,1111111,,. the fallacy of such an objection. The con-. lestants cannot cheat when playing a radio game any more than they can cheat when WORKRITE 180° engaged in the usual game. If one player makes a move without reporting it, his attempt to cheat will appear on the other SUPER VARIOCOUPLER later and one ex- player's board sooner or represents months of experimenting to make perience of this kind is sufficient to prove The WORKRITE COUPLER that it is best to play honestly. it the best that it can be made. Why bother with a coupler that simply "works," Chess can be played in much the same when you can get a WorkRite that will tune in the ones you want and tunes out if way. The boards can be numbered, or the others. the players are expert enough, it is not necessary to use a numbered board. For Bath stator and rotor mad- from formica and wound with double silk covered wire of the however, it will facilitate the exact number of turns to make it perfect. All metal parts made from brass and highly polished beginners, nickel plated. Shaft 3/16 in. Both connections made by spring contact eliminating all scratches. playing if numbers are employed. The Binding posts attached for connections. Oscillates perfectly from 200 to 600 meters. The game of chess is carried on in much the WORKRITE COUPLER tunes extremely sharp and is very sensitive. PRICE $6.00. same way as checkers. Cheating is just as inadvisable. A trip through a sporting goods store or toy shop will bring to light many games Illustration TYPE "A" Take, shows actual that can be played over the wireless. s iz e s. Binding "Bringing Up Father" for instance, which post has hard WORKRITE is the latest. In this game, little spinners rubber top. All various moves metal parts made are used to determine the from brass, nickel HYDROMETER that are to be made. In fact, this principle plated. Will fit is used in numerous games. If each station panels from 3/16 Double the life of your bat. has one of the game boards and one of the in. to 5/16 in. tery by giving it proper care. thick. Fill and test it regularly with spinners, asmany as four people can enjoy a WorkRite Hydrometer. Never the game at one time. The little spinner is let it become discharged belo manipulated and the arrow stops at a cer- WorkRite Binding Posts $ .12 1150, or it will soon be ruined. number. The player then makes this .04 Full instructions for testing tain WorkRite Switch Paints and care of battery with each move and reports the move to the distant WorkRite Switch Strops .06 "WORKRITE ". Get one now! player who accounts for the move on his WorkRite Switch Arm with bushing .50 PRICE $1.00. own board, moving the button forward to the proper position. He then spins for himself and in turn reports this to the opposing Insist that your dealer furnish a "WORKRITE ". Accept no substitute. players. If he cannot supply you, we will ship direct by mail prepaid. Every game in which the moves are determined by a spinner or by throwing dice can be played by radio. Most of the popu- JOBBERS AND DEALERS Write or Wire for Discounts method, and for - lar games depend upon this that reason there are few gaines that cannot be "radioed." 5602 Euclid Ave. Many card games have been very successfully played by wireless. Some wire- THE WORKRITE MFG. CO., Cleveland, Ohio. less fans have gone to the trouble of in- venting new games that lend themselves to this sort of playing. One enterprising fan has brought out a game that he calls Radio - êtes. To play it, a single pack of cards is divided between two stations, each station TUNESHARP VARIOMETERS The cards are laid face receiving 26 cards. at the following prices are without doubt the downward. A starts the game by turning Best Buy on the Radio Market today cards over. Let us say that it ine of his VARIOCOUPLERS is the ace of hearts. A at once reports this VARIOMETERS over his top card and Complete - - - $5.00 Complete - - - $4.00 to B, who then turns Unassembled - - 4.00 Unassembled - - 3.00 attempts to match A's. If B turns over, (P. P. Wt. 3 Lbs.) (P. P. Wt. 2 Lbs.) say, the ace of diamonds, he is credited with the ten of Complete Knocked -Down Set, Wound, $10.00 ten counts. If he turns over (P. P. Wt. 6 Lbs.) spades he gets nothing. However, if he happens to turn over the eight of hearts, he " THE HOUSE OF SERVICE" gains five, since he would then be matching the .cuit of the first card turned over by A Line Electrical Supply Co. First A turns over a card and then B, and and We Lave in stock Panels, Switches St. Dept. N3 St. Louis, Mo. the plays are made alternately until the Other Apparatus to Complete your Set 1129 Olive halves of the deck are exhausted. The cards are then picked up, shuffled and the game continued until one player has two Subscribe Radio hundred counts to his credit. To sum up Insure your copy reaching you each month. to News 236 A N. Y. this game : One player simply tries to match --$2.50 a year. Experimenter Pub. Co., Fulton Street, the card turned over by his opponent either

www.americanradiohistory.com Radio News fur March, r92 a

in number or suit. If he matches the card. he gets ten points, and if he matches the suit he gets five points. It is, of course, necessary to carry the game through on an $15 honor basis. 66 The podular game of rummy can be SHRAMCO played very nicely by four players, two at In Canada $18 each station. To do this it is necessary to 9, overstep the rules of the conventional game PRODUCTS F. O. B. to a slight extent. However, the new game Niagara Falls is just as fascinating and requires the same amount of wit and just as much enjoyment Type DXA -3Já-Mahogany Finish Case can be had from it. Two separate packs of Amateurs: Send 5c cards are in used, one at each station. Each stamps, today Equip Your Radio of the four players is independent. Every- for our Telephone one plays for himself. The progress of the new Catalogue L show- With the New game is reported at various times. Let us assume that we have four players, ing complete line of USL "A" Battery A, B, C and D. If A succeeds in laying parts, raw materials and 6 Volts, 6o ampere hours- mahog- down three or four cards, a report is im- high grade apparatus. any finish -non -leakable post bush- mediately made to the other station. If A's ings. Designed especially for Radio good luck continues and he succeeds in lay- Telephone service so as to retain ing down all his cards he wins the game Dealers: Write for our and each of charge on open circuit and to give the other players must have attractive proposition. long life. Plates built to U. S. Gov- the number of counts in his hand chalked ernment specifications. A quality up against them. The game can be carried product in every detail, backed by on in this way, or if the players wish, one 21 years' experience gained in mak- station can play against the other. The ing over two million storage bat- game is carried on in exactly the same way, THE SHOTTON RADIO teries. only the counts, instead of being marked against the individual players, are marked MFG. COMPANY, Inc. Purchase your USL Radio Telephone "A" against the station. Battery from any of 4600 USL Service Stations and Dealers. If no representa- 8 Market St. Albany, N. Y. tive in your town, we will ship by express on receipt of draft or money order for $15.00. How to Make a Radiophone Receiving Station U. S. LIGHT & HEAT CORP. (Continued from page 836)

, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Niagara Falls New York tarn ,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,l,,,,,,,,,,,,,,,,: U. S. LIGHT & HEAT, Limited one telephone receiver, though a pair is the 4i Niagara Falls Canada more satisfactory Dio íï arrangement. A very good pair may be obtained for four or five NEWARK dollars and as the distance over which a f set will receive is governed to a great extent by the type of receivers employed, it RADIO SHOP SUPER recommended -SENSITIVE is that good receivers made GALENA specially for radio be purchased. AND RADIOCITE After these requisites have been secured. Can't be beat, a million good spots, everyone guaranteed to be louder than the ordi we come to the installation of the appar- nary common crystals. Everyone guaran- atus, which is a very simple matter. The teed to give good results or your money .lead -in wire is connected to the binding returned, A large generous piece 25c, mounted in Woods Metal 40e, by mail 5 post of the tuning coil which is attached to cents extra. the end of the wire wound around the cyl Binding Posts 5 cents up send for our OUR NEW ROTARY AMPLI- inder. The binding post which is con samples. At all times during the present netted to the slider rod is then shortage we haven't failed as yet to fill the FIER CONTROL SWITCH connected many requirements for the Amateurs. to one side of the detector and the other Distributors for Murdock, Grebe, DeFor. with AUTOMATIC FILAMENT side of the detector is connected to a wire est, Fada, G. A. Co. Dealers write for our CONTROL. which runs to the ground connectior. The proposition. Takes the place of filament control jacks and receiver cords are connected to each side THE RADIO SHOP OF NEWARK plugs. no more. Costs Our Switch will puf of 41 S your amplifier in a class by itself. Gives the detector, as shown in the illustra- ORANGE AVE. NEWARK, N. J. instant control of det. and 1- 2 and 3 -stage tion. amplifier. Furnished with knob as shown, In making the ground connection from screws for panel mounting and blue print of directions. the detector, it is merely necessary to run PANELS PRICE $6.000 a wire to a water or gas pipe, located some- 3/16" hard rubber polished cut to order. Old Eng- where near the receiving instruments. The lish monogram with lodge emblem. 3 cents per square Send for folder giving complete description inch. of this and other apparatus and materials. be Holes drilled any size to one -half inch, 5 pipe should thoroughly scraped and the cents; over, 10 cents. Instruments mounted free if STORM -LEE RADIO APPARATUS CO ground wire wrapped tightly around it and ordered with panel at standard catalogue prices. 742 Highland Avenue NEWARK, N. J Vernier attachment placed on instruments for $3.00. soldered if possible. Send full size drawing showing location of drilling Large Variometers, inside windings $5.00 and size of hole. IMUMMwnMMMM,,,,,.MMMMMMMMl,, MMMMMMMMMMMMMMMMMMme Variocouplers, multiple and single turns on bake- M All panels without Instruments 20 cents postage Iite tubes 4.00 in U. S. Large Variometer Balls .50 Important New 22 DCC Magnet Wire quarter pound .30 Radio A. R. WOOTTEN (All Sizes Carried) 10726 110th St. Richmond Hill, L. I, Hard Maple Stators for variometers, per pair.... 1.50 Legislation Windings in place 1.10 (Continued from page 818) Large Variometer Balls, wound and axles In place l,tO :, MM,,,,,MMMMMUMMMMMMMM.1.1,,,M MMMMMM.IIIIMMWWMM1,11.MMMMM No. 6647 OAK CABINETS $1.20 7 x 7 x 6" Deep 315 100 7 x 10 x 6" Deep 2.50 amateur broadcasts speech or music on a per 7 x 12 x 6" Deep 2.:5 wave-length say below zoo meters. for the No. 7138 7 x 16 x 6" Deep S.:5 reason that the present commercial 6 x 14 x 6' Deep 2.75 broad- $1,30 12 x 14 x 6" Deep 4.00 casting stations use a wave -length of 36o No. 71, like cut, 7-c per 100 Dealers Write for Proposition. meters. Inasmttcll as the tuning has to be No. 72, larger, Sc. Nickel polished, 75c 100 extra MEADE BAKELITE AND RADIO APPARATUS quite sharp anyway 44 Jefferson Ave. Brooklyn, N. T to receive the present CONTINENTAL ELECTRIC COMPANY radio concerts, etc., it would seem that the 118 East 129th Street. New York, N. Y. =THE HOUSE OF RADIO= lower wave -length would certainly not interfere with that of the WING to the unprecedent demand for Arnold QUALITY SERVICE commercial stations Apparatus I wish to advise those who have cent AND Will you be kind enough to inform the 0 inquiries for ¡ny Literature Ac, same has not writer fully, so been forwarded because my entire output has been PRICE we can publish an intelligible ..sold out. article in connection with this matter, and Literature will be forwarded in the near future and Try us and See ,ou will be able to get from your dealer Arnold ap- greatly oblige, paratus as in the Yours respectfully, past. KELLY & PHILLIPS J. F. ARNOLD, 2082 Lexington Ave., N. Y. 312 Flatbush Ave. Brooklyn, N. Y. (Signed) H. GERNSBACIK, Manufacturer of the Arnold Loose Coupler Editor RADIO NEWS. Established 1910 Tel. Conn.

www.americanradiohistory.com Radio News jor March, 1922 899

Department cf Commerce, Office of the Secretary. Washington, Jan. 31, 1922. a man write a better book, preach a better sermon, or make a better mouse -trap than 1\1 r. FL Gernsback, "If neighbor; though he build his house in the woods, the World will RADIO NEWS, his Editor, make a beaten path to his door. " Emerson 33 Fulton St., New York. -

Sir : I have receiver your letter of the loth instant, requesting information concerning; ( the new regulation prohibiting the use of amateur radio stations for broadcasting. The new regulation is not intended to wkito permanently prohibit amateur radio stations performing a broadcasting service, but to prevent the indiscriminate use of any amateur station for service of this FIRCO JACKS kind. Broadcasting is a new service which had developed rapidly within the last three months, and which can be made of great public benefit in many ways if properly regulated. It is realized that certain regulations must be enforced or the value of the service will be destroyed. The first regulatory steps have been taken ;in connection with the larger stations, limiting them to certain wave lengths and classes of licenses. It is not possible to as- sign to each station a special wave- length for broadcasting, therefore the wave- length of 36o meters was selected for broadcasting entertainment and the wave -length of 485 meters for Government reports, such as market and crop estimates and weather forecasts. It is desired to arrange some satisfac- present, the tory plan for the amateurs. At FIRCO Jacks were not. offered until our engineers were assured they 'following plans are under consideration: had produced the best Jack on the Market. They are now working on 'First, authorizing amateurs desiring to in Firco products, which will be announced public some very radical innovations broadcast, if such broadcast is of in an early issue of this magazine. benefit, to use the wave length of 20o meters Alloy nickel - at certain specified times, so as not to seri- These Jacks have heavy Sterling Silver Contacts, Special ously interfere with the existing amateur silver springs, giving highest resiliency. ; Second, to allow radio telegraph service circuit closed $ .85 to broadcast only on 175 or 225 Type 201 J Single smateurs Type 200 J Double circuit closed I.o0 meters, leaving the 200 meters wave -length open .70 amateur communication Type 202 J Single circuit open to regular Type 204 J Three spring automatic filament control I.20 service. Type 203 J Five Spring automatic filament control 1.50 If it is decided to authorize broadcasting on 175 meters this authority can be in- Seibt Condensers :hided in their present regular amateur sta- The Famous 225 meters is authorized Meters, Frequency Meters, and other Precision Instruments are tion licenses. If Capacity the patent rights and special amateur station licenses will be nec- now controlled absolutely by us. We have purchased ssary. will continue to be exclusive distributors. It is not the intention of the Department A Word to Our Dealers unreason- to impose upon the amateurs any orders, but with increased production we are he helpful to the We arc overburdened with able regulation. It will our best to keep up with the insistent demand. We ask you to be if the amateurs will cooperate doing $35; Laboratory Department a little patient on Vocaloud deliveries. Station type now in arranging a plan which will be produc- to the largest type $30. tive of the greatest good Place your orders now for April and May requirements number. so you will be in line for prompt delivery. Broadcasting should he considered a service desired by the public and not operated solely for the amusement or benefit JOHN FIRTH & CO., Inc.. of the individual having the broadcasting 18 Broadway New York station. Respectfully, (Signed) C. H. HUSTON, Assistant Secretary of Commerce. U. S. GOVERNMENT RADIO BLINKER SIGNAL SET The Relay Antenna Transfer A model of perfection and all- around utility, officially adopted by the U. S. Army Air Serv- Switch ice, U. S. Marine Corps and Navy Department (Continued from page 820) Bureau of Steam Engineering. It is a self. contained unit, and may be operated on the table, in the lap, or in any position desired. Note detachable arm. should be maintained between the transmitter and receiver antenna contacts. Very Special Price $6.00 small spacings can be employed with CW Ask your dealer or write us. sets duc to the much lower voltages encoun- tered for the same output than that obtained Of high trade construction, designed fer the purpsee Frank B. Perry & Sons sets. of instruction in audible or visual signals. with the with the obsolete spark International or other codes based en the dot and Newton Center, Mass. It is hoped that this relay, because of the dash principle. It is srentinestlr made for efficience. Providence, R. I. compactness and durability. ease with which changing from transmit- simplicity, ting to receiving can be effected, will stimu- use of the up -to -date CW and ICW $2.50 today, plus postage for 7 lbs., and your copy late the A welcome addition to your library! Send help to eliminate the obso- News will come forward mall. equipment and of bound volume No. 2 of Radio 6byFtireturn New York City lete spark sets and the QRM caused by Experimenter Publishing Company, Inc. them.

www.americanradiohistory.com 900 Radio News for .11 arch, 1922 Government Needs Assistant Special Prices on Complete Sets and Parts Radio Engineers The United States Civil Service Commis- sion announces an open competitive examination for the position of assistant radio engineer. A vacancy in the office of the Chief of Air Service, Washington, D. C., at $2,400 a year ; a vacancy at Camp Al- fred Vail, N. J., Signal Ser -vice at Large, at $2,000 to $3,000 a year ; and vacancies in positions requiring similar qualifications, at these or higher or lower salaries, will be

filled from this examination, unless it is. found in the interest of the service to fill any vacancy DIALS by reinstatement, transfer or Anti- capacity, metal, with large black knobs, promotion. for regenerative sets-4" for grid & plate variometer, each $1.40 Applicants should at once apply for de- 3" for Variocoupler, each 1.25 tailed information, and for Form 2118, stat- We carry a full line of all the best Wireless Complete Receiving Set ing the title of the examination desired, to Apparatus and parts. Special Genuine XX Gracie Bakelite -Dilecto panels, cut at $10.50 the Civil Service Commission, Washington, any size to order. 1 pr. Murdock No. 56 -2000 ohm plrones $5.00 D. C.; 100 ft. pure copper aerial wire .90 the Secretary of the United States 2 pr. glazed cleat Civil CABINETS insulators .10 Service Board, Customhouse, Boston,. 1 approved Solid oak, waxed finish, size 18 x 7 $4O0 ground clamp .25 Mass., New York, N. Y., New Size 12 x 7 3,50 1 portable -600 meter receiving set and guar- Orleans, La., Size 7 x 7 3-00 anteed crystal detector - 5.00 Honolulu, Hawaii; Post Office, Philadel- Hinged top, additional .50 phia, Pa., Dealers, send for quotations Total $11.25 Atlanta, Ga., Cincinnati, Ohio, EURACO Mica Grid Condenser .00025 AUDIOTRON Chicago, Ill., St. Paul, Minn., Seattle, Mfd. to fit standard grid leak base, .60 Genuine Two Filament with adaptor Wash., Special while they last 6.00 San Francisco, Calif., Denver, Colo.; Old Customhouse, St. Louis, Mo. ; Adminis- Beacon Radio tration Building, Balboa Heights, Canal & Electric Company Zone; or to the Chairman of the Porto 246 Greenwich Street, Tel. Barclay 3189 New York City Rican Civil Service Commission, San Juan, P. R. Receipt of applications to close on March 2I, 1922. TRADE-MARKS AND Something to Try pATENT COPYRIGHTS BY FRANK BUKACEK. Before disclosing an invention, the inventor should write While experimenting at the radio station for our of Coe College some time ago, I discovered blank form "RECORD OF INVENTION ". This should be that phone and C.W. stations will come in signed and witnessed and if returned to us together with model or more consistently and louder on the single sketch and description of the invention we will give our opinion as coil, tickler circuit such as the Grebe CR -9, to its patentable nature. Electrical cases a speciality. CR -5 and the \\ estinghouse set, by disconnecting the ground and connecting the ends Our illustrated Guide Book, "HOW TO OBTAIN A PATENT," of a loop antenna to the antenna and ground sent Free on request. Highest References Prompt Attention Reasonable Terms posts, leaving the regular antenna connected 1111111111111111111111111111111111111111111111H.M..11111111, on. FREE COUPON 1111111111111111111111111111111...... 11, This connection seemingly works one way VICTOR J. EVANS '& CO., Patent Attorneys only, that is to say, one end of the loop con- Chicago Offices: Pittsburgh Offices: Philadelphia Offices: OlSices: nects to the antenna post only and 1114 Tacoma Bldg. San Francisco the other 514 Empire Bldg. 714:715 Liberty Bldg. Hobart Bldg. end to the ground post only, for best re- New York Offices: 1001 Woolworth Bldg. sults. MAIN OFFICES: 919 NINTH, WASHINGTON, D. C. I was listening to Name Address KDKA's bedtime story when I discovered the above, and almost fractured my ear drums as a result of the increased intensity of the carrier wave. Wonderful Course in Wireless at Home The dimensions of the loop appear to be the limiting FREE INSTRUMENTS factors as regards wave- length. Phone stations and C.W. stations come in AND TEXT BOOKS Theory better than spark stations. The strangest part of it is that no directional effect is Text Books noticeable. I discovered in my own station one even-. est Instruments in that the above mentioned circuit requires no external ground. 9X1 surprised In addition we furnish free a complete Vac- me by coming in louder without a ground This wonderful Set for learning the Code furnished uum Tube Radio Phope Receiving Set. Send than with one. I have heard KDKA once for free quite FREE with our Course at catalog. normally on a Grebe CR -9 using no ground, way out N. Y. WIRELESS INSTITUTE 258a BROADWAY, NEW YORK here in Iowa.

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STPR Club Gossip NEW MOTORS MRPT DERIVOE s (Conti,ztted from page 835) ALL SIZES UP TO S H.P. Compo -site, Inc. HUI 111.1111M.M.M.M.MMTMImMIMIIIIIMMIIIIMIMirimm.11...... ,,,,,,,, We Specialize In Small MotorsEGenerators 207 -215 ASTOR . ST. NEWARK, N. S. reception of the long -wave stations. We also have 511 PHASES AND FREQUENCIES IN STOCK AT ALL TIMES a smaller aerial for the reception Established 1910 of amateurs. Largest e,,ciusive MaI Order-Small Motorcealers in the world. The smaller aerial will be used for transmission also, CHAS. H. JOHNSTON, Boxfp.West End,Pittsburgh,Pa. Manufacturers of The club has been very fortunate in securing WIRELESS,TELEPI1ONE RADIO AND ELECTRICAL the services of Mr, J. Jacob, manager of the GENERATORS Radio Exchange, as president. 500 VOLT- 100 WATT P. M. The Radio Exchange - 3400 R. PARTS IN SHELLAC is backing the club and is donating gUNTING MOTOR GENERATOR_ SETS. the use of any COMPOSITION equipment the club requests. The other officers FOR O 50 of the club are: Mr. Herman Asmus, vice- presi- dent; Mr. Owen l EACH Marsh, secretary and treasurer, Manufacturers of molded, mechanical and and Mr. Milton Reiser, sargeant at arms. electrical parts in plastic composition. We would like very much to hear from other RITE FOR' Quantity production our specialty. radio clubs in CATALOG this territory Address all communications to the secretary, Mr. Owen Marsh, 3 91.5 Peters Ave., Sioux City, Iowa.

www.americanradiohistory.com Radio Acws !or dlarch, 1922 go1

There's Nothing too Good for the Man with Brains from page 826) (continued ° hunderd an' fifty," said Sam wonderingly. "But I'se gettin' fifteen, now. Specks to get sixteen stahtin' right aftah Crismus." "Sam, do you ever hear music on that Radio outfit down there ?" asked Wheeler. "Pass, suh. I gits snatches of it in de evenin's sometimes. Times is when it's real clear, but that low down radio trash they got ain't no good 'tall. Now of I jest had my new set on dat little of aerial, why - yoh could heah de musics all ovah de town," boasted the little coon. "But Mandy, she winds the bed roun' my neck ebery time I peeps 'bout it " Wheeler cut in with, "Are you sure that your set will work anywhere near that well, Sambo ?" "Abso-tootelooey," Sam declared. "C'ose, The Tuska Moulded Variocoupler 'twould need a few little finishin' touches yet, whut I cain't afford, lessen Mandy does equipped with a Tuska Knob and Dial is not only an mob washin' an' less heavin' de sideboard at me whenevah I says any instrument of striking beauty, but it is mechanically built "Listen, Sam. Where is your set now ?" and of superb electrical design. "Hid up in de bahn. Mandy'd smash -" "Sammy, how would you like to quit your job with the Ihorld and work for me for You make no mistake in demanding fifty dollars a week ?" Astonished, Sam opened his mouth, shut it again with a snap, bit his protruding tongue, and swore. TUSKA APPARATUS "Doggone! Whenevah I does dat I knows dat my cup is gonna runneth ovah. How many of dem dare iahn men did yoh say ?" 1 Send 5 cents "Fifty, Sam," said Wheeler laughing. The C. D. Tuska Co. For our Catalog "How about it ?" "Man, yoh is malt bacon. Who does you 24 Hoadlley Place No. 2 all want murdered? Which will be mah capacity at dis heah beauteous sum per each HARTFORD Saturday nite ?" CONN. "You will he chief Radio reporter on the Memphis Journal. But in addition, I have Price a little scheme which should net us each over twice what I have just offered you. I have already had a fine set installed in the Type Journal's offices, so you won't have to work 233 $7.00 on any low down trash any more. Come on in, Sam, and let me tell you about the rest of it." The editor and his colored employee of five minutes entered the office of the former. A half -hour later, Sambo emerged, a huge grin splitting his face wide open. His step was light and springy as he swung along o homeward. He stepped into the door of his Cv house, grinned amiably at Mandy, and sat him down to his battered old desk. "Mandy, yoh can put de sideboard in de attic. Yoh sho ain't gwine t' need it t' throw at me no moh. Caise I done nevah gonna say no moh 'bout dat antenny. Don' want de darn thing no moh," he said as he pulled a yellowed sheet of stationery out of a skibbet -hole. Mandy was amazed. LIGHTNING STORMS AHEAD "Is yoh sick, Sambo?" she queried. Sam shook his head mysteriously. "No. PUT IN PROTECTORS but I might be dreamin'," he said. Mandy, a little awed by the distance her "JACOBUS" husband's chest stuck out, and by his un- afraid, and otherwise unusual manner, re- treated to the kitchen door where she stood Type J. S. W. leaning on her broom, surveying the back For use in place of Sam's curly pate. Noting this from the The Vacuum of corner of his eye, Sam immediately assumed Protector a more important and business -like manner, Aerial Ground or Lightning and with many "Alt- hum's" and scratchings Eliminates amid his wool. composed his letter of resig- Switch nation from the staff of the World. Switch Throwing When finished, he arose, cast a sidelong glance at Mandy, and moved toward the door. :When outside, he peeped in at her, EVERY AERIAL MUST BE PROTECTED and said, "They ain't nothin' too good for $2.00 From Your Dealer or Sent Direct de man \vif brains, Mandy. Specks maybe yoall kin have dat air chicken -fedder hat 81 Orange St., Newark, N. J. gonna be gone E. JACOBUS, 'long 'bout nex' week. I'se of Apex Electrical Specialty Co., Inc. foh a time. Don' take in no mob washin's Arrester Division flan yob has to."

www.americanradiohistory.com Radio News -for March, 1922

And he went whistling away down the street. Mandy was dumbfounded and a little Dealers and Amateurs Scared. "Dat main sho have done gone plumb bughouse ovah dat fool ray- dee -oh. 'Taint Say Try no use, l'se got to brain him an' put him you have been looking outen his misery," she mumbled to herself. for a book giving As he had promised, Sam did not show de- up for several days, and his spouse was dis- I tails of good sets, get tracted. She made the rounds of the neighbors, telling them all about the "idiut ray - dee-oh" and its dreadful effect upon the human mind, loudly bewailing the fact that DESIGNS OF MODERN QUALITY SATISFACTION she had not let the antenna go up long ago, and that she would never more see her poor RADIO We serve thru six stores and dis- little "Lily." RECEIVERS tribute the full lines of Radio Corpor- A few days later, the towns of Woods- ville, Hampton, A splendid volume giving clear ation of America, Clapp -Eastham, Seedville, Cedar Creek, and photographs, Remler, several others, all of which were little iso- scale drawings, and Chelsea, Signal, Murdock, lated simple instructions for making Electrose, Federal, villages around Memphis, were buz- Magnavox, Conn. zing with excitement. On the roof well designed crystal and audion of the receiving sets, Tel. & Electric Co., and others. town -hall of each little place had been including two spe- erected a strange- looking cial regenerative receivers for RADIO CORP. PRODUCTS contraption of radio phone wires strung from upright poles. And prop- reception. This ap- UV 200 Radiotron detectors $5.00 aganda had been spread that paratus is so designed that you. each week there can build it in your UV 201 Radiotron detectors 6.5o would be given in each town, a hoedown "kitchen table work shop" with UV 202 Radiotron detectors 8.00 for colored folks exclusively, with the finest, the simplest most up -to -date music tools, yet the finished appearance UP 1627 Filter Reactor 15.75 by Radio. A large and the operation advertisement also appeared to that effect in of the instru- UP 1638 C.W. Transformer, 325 watts the Journal from Memphis, ments will be equivalent to the giving the finest you UP 1016 75o watt C.W. Transformer schedule of dances -Monday in Woodsville, can buy ready-made. Tuesday in Hampton, You need this book. UP 1638 C.W. and so on. Transformer...... 25.00 Monday UP ioi6 C.W. Transformer.....38.50 night of the first dance came, The Price and the hall doors were mobbed long before is UC 1014 .002 MFD. Condenser.. 2.00 opening time. When the doors opened, UP 415 Plate Reactor 5.75 there sat Sambo John Rockefeller, etc., 50c White, PX 1638 Rotary Grid Chopper 7.25 chest puffed out to the bursting Postage 4c UR 542 Sockets i.00 point, before his instruments, tightening up a binding post here, adjusting a condenser BALDWIN PHONES there, but all the time seeming to watch the The wonderful eager crowd with the whites of his eyes. 88-N Park Place receiver The The General Clapp -Eastham Type HR for dance was a huge success, and Sambo New York City was the hero of the hour. Send 10e for the new spark or phone $35.00 Apparatus CompanyP Each succeeding dance was the same, and Y G. A. Catalog Clapp -Eastham Type HZ 2 stage Sambo's amplifier eyes bulged dangerously as, at the 35.0o end of the week, Editor Wheeler handed 6 -Volt storage batteries, 8o amp him the Journal's check for fifty dollars, hour - 12.00 and his personal check for a hundred and The "QSA" Line of Radio Equipment Our own 3" bakelite dial, 13/8" thirty dollars! Larger business has made necessary larger space and larger stock. So we have moved knob 1.00 Without a word, Sambo clenched the where into new quarters we will be better able than ever to supply New Maximus checks in his fist, and started a your wants. Items listed below Clapp- Eastham on run for mediate are in stock for im- Amplifying Transformer 4.5o home, but as he passed the hank, he stopped delivery. short Cunningham C -300 detector and considered. Cunningham $5.00 C -301 amplifier 6.50 "No sub !" he grinned. "Dis yere money Radiotron U.V. 202 -5 watt Federal power tube 8.00 ain' safe within Mandy's No. 226 -W amplifying transformer 7.00 heavin' range. Everready No. 766 variable B battery 3.00 Dis goes right in heah, ceptin' a little." FADA No. 120 -A panel mounting rheostat WHITALL Saco Clad 1.00 That evening, Sam sat the head amplifying transformers 5.00 at of his Paragon V.T. socket No. multiple seated table, and grinned inces- 30 1.00 Catalog of "QSA" equipment will be santly. cents which sent for 10 ELECTRIC will be refunded on initial order or "Reckon," he said, glancing at Mandy. FREE with order from this advertisement. "Reckon, dat of yo'se gwine to de hoe- Chicago amateurs -are lucky! We have something down at Woodsville Monday new for you. Come in and investigate our "ham COMPANY nite, yoh bet- room." You'll be glad you did. New location I ter have dat chicken fedder hat. How easily reached from all parts of the city. WESTERLY, R. much is him ?" Radiophone converts-Call, or write us for estimate "Foh dollahs," replied Mandy breath- on complete radio installation for receiving wire- SEND 4 CENTS FOR CATALOGUE less music, etc. Come in and ask as many ques- lessly. tions as you like. "Hmmmmm. Well, heah's yoh grocery money an' heah's three dollahs molt Put Independent Radio Supply Co. a dollah of yoh chicken money wif it, and 3239 Ogden Ave. THE AMATEUR RADIO CENTRAL git de hat," Sam spoke generously. CHICAGO, ILL. IN LONG ISLAND "Sambo, mah little Lily, I's usually a "A Radio Store with a Conscience" awful shy an' gentle little lady, but w'en We can make immediate delivery on yoh is like dat -" FADA accessories She came around the table. TUBING FOR WIRELESS "W'en yoh is like dat, I jest gotta kiss SET OF 6 CARDBOARD TUBES IN HEAVY RADIO yoall," and she spread her lips over Sam's MAILING TUBE FOR $1.00 RIDGEWOOD SHOP physiognomy. Postage Prepaid Each Tune is 12" Long 1603 Myrtle Ave. Ridgewood, L. I. with'" Wall. Sizes are 3 ", When Sam got his breath, he said, "They 35/1 ", 4 ", 41/2", 5 ", 51 ". Any One C'ize 12" Long ALL cars to Wyckoff Ave. reach our door. ain't nothin' too good foh de man's whuts for 25 cents. Mail orders given immediate attention. got brains. Reckon, maybe I'll make up dat RUTHERFORD SUPPLY HOUSE dollar to yoall 'bout nex' week." 78 CHESTNUT ST. RUTHERFORD, N. J.

STOP ! ! STOP ! ! SUPER STORAGE BATTERY STOP ! ! For wireless purposes Our new Price Bulletin will be sent to anyone on receipt of a 2c stamp to cover postage. 6 Volt 80 Ampere Hour 45 lb. battery A complete Stock of all Standard makes 'of Wireless Apparatus and C.W. Supplies always $13.50 F. O. B. carried in stock. ALO SPECIALTY COMPANY All shipments made same dey as received. 614 N. 32nd St., East St. Louis, Illinois Each battery carries -one- -year pro -rata guaran- APEX RADIO SHOP 1105 W. 69th St., CHICAGO, ILL. tee against defects. Shipment by express unless otherwise specified.

www.americanradiohistory.com Radio News for March, 1922

A Transmitting Tube is A Good Amplifier 3 l t,nlinued from page Sao) feitrat 3 caused from that source as these coils will stand well over Soo volts continuously Junior without danger. The transmitting tube is also much freer from distortion than lower voltage tubes, and when used at or slightly belcw their rated voltages will give a minimum of distortion so long desired for the perfect reproduction of the wireless music and speech. Try transmitting tubes if you need greater volume for your loudspeaker, and T is unrivaled you will be surprised at the excellent speech as well as the increased volume. in its simplicity of installation; in its effec- The Ordeal (Conlirwed froid paye 827) of operation; tiveness PRICE IN U.S.A. as possible," said the captain, for the first in its beauty of form time removing his cigar from his mouth. $25.00 "Details are unnecessary. Everything has and finish. already been arranged for except your part. We arc now in the midst of a thick fog. out an All you have to do is this : send show SOS, give out the position of the ship and Let your dealer also that we are ablaze and are about to abandon her. Isn't that easy? For this you this unique slight service, very slight compared to what you did before, you shall receive one thousand dollars. How does that sound to you ?" instrument. Kluge puffed vigorously on his cigar, he seemed to be deliberating what the captain Rii, had offered him. So they expected him to eberat etep one send out false distress calls. What advantage would be gained by the owner if Co. find the l.r & Tetegrapb this were done? He determined to 1-, answer by seeming undecided. "Well ?" said the captain. Jfiuffato, P. D. ' "I'll have to know the reason for the have SOS," blurted Kluge obstinately. "I re'Aa;sY: to know what I'm going into." y,x,ä:r'v'ykt,_.u` Johnston grinned and nodded to the com- -`Éót.. mander. 2ÿ:5' "Very simple," the uniformed man began, "all we intend to do is this: after the ship is supposed to be abandoned we'll lower a boat. Part of the crew and Mr. Johnston will be in it. They'll tell the rescuers about the supposed destruction of this vessel by fire. We'll then change the name to the S. S. Tirso and no one will be able to tell the S. S. Midway from a hundred other ships like her. We shall then sail under the Spanish flag. Papers and everything INSTRUMENTS else have been arranged for. The cargo we USE JEWELL have is very valuable as is the ship. Leave in Your C. W. Set it Johnston collect the insurance to Mr. to To properly time up a C.W. set, in- in full. As I said. there are details with a wiich you will have nothing to do, and it struments in the various circuits are be unnecessary for you to know about necessity. will RtfIO FREQUENCY Jewell instru:nen for alternating, di- them." AMPERES rect and radie frequency currents are "i sec," murmured Kluge, "but when no work and trace is found. what then ?" designed especially for such "Some disaster has overtaken us." smiled are proving their value wherever used. the captain. "This is your chance to get Order from your dealer away from the police. The rest of the crew we'll let off at some foreign port with Jewell Electrical Instrument Co. enough money to keep them in booze for a CHI 2AGO long time. They don't know what's up anyway. No need to fear them, they're all crooks wanted for something or other." "Your scheine is very clear to me now!" cried Kluge. His eyes flashed with indig- ! ACT ! nation. ."Thought I was a crook, did STOP ! LOOK and you? \\'o supply free of rharre with each 50 watt ti.\'. power tube, price $::0.00, the R.C. .)f A. porcelain \\'ell. you thought wrongly. I'll have noth- P.T. Socket. price $2:le; and with ea ^h 5 watt V V.-' 262 power tub price EN, your rhni: e of either Socket. insatisfaet.try Radintron ing to do with your nefarious crime." a Fada 5 ampere Nichrome power rheostat or It. C. of A. porcelain V.T. Tubes will be reploted at once. No risk. Shipped post pa 'd and insured. Inlme.hst, delinry. Dis- No sound disturbed the absolute stillness. tributors for Acme, R. C. of A.. and Federal C.W. Apparats.. Both men were momentarily dumfounded. THE KEHLER RADIO LABORATORIES, Dept. R, ABILENE, KANSAS The captain's first thought was that their diligent could plans not be carried to a suc- We are interested cessful finish. He then saw his dignity fall- Manufacturers . literature and prices. TELEGRAPHYACCOUNTING they. ing. Even a word to the proper authorities (Morse end Wireless) and RAILWAY taught ughly. BIa hulas; great opportunitlee. Oldest, largest hood. would ruin him. Once before he had been E. A. ERICKSON, Electrical Supplies Endorsed by Telegraph, Railway, Radio, and Government &Befall. Expenaee to w- o p tunities to earn Ìart. !rtton. Catalog free. called before the shipping board. and only 7834 So. Halsted St. Chicago, Illinois DnDG6'S IN -T'Iil UTE, D -.t ot, Valperalso, Ind.

www.americanradiohistory.com Radio News for March, 1922

by painstaking pleas of his innocence did they dismiss the charge. Only lack of suf- HYGRAHE SPECIALS ficient evidence saved him. The owner did not appear. worried: he Save You scrutinized Kluge as a detective views a WIRELESS Money criminal. Satisfied with his circumspection, Audiotron tube, two filaments $5.50 he smiled. The smile turned to a sneer, Radio Service V.T. Sockets .80 and the man winked at the perplexed cap- CATALOGUE 223/2 Volt Cyclone Small B. Battery .90 tain. Whether you Volt are interested 22% Cyclone Large. B. Battery 1.60 "You certainly know how to get it, Kluge, in a complete radio receiving 45 Volt Cyclone Large Variable B my boy," guffawed the owner. "It doesn't outfit, or a half a dozen bind- Battery 2.75 ing posts, fool me, though. Ha- ha -ha, I don't see how you'll find the par- 22% Volt Large Eveready Variable ticular instrument, best for B. Battery the jury could doubt your sincerity on the 2.50 stand. your needs, in Corwin' cata- Binding Posts (rubber cap), per doz .76 They must have been twelve deaf logue. Send 10 cents (credited .0005 Mf. Grid Condensers .25 men. No, Mr. William Kluge, you cant to your first order), for your .002 Mf. Phone fool a man with my experience." copy today! Where's the near- Condensers .25 est mailbox? Variable Grid Leak, % to 3 Megohms Kluge did not understand the man's de- Electrose Ball Insulators, each .28 clamatory outpouring. He had expected per dozen 3.00 both men to curse him in anger. The captain no MARKO STORAGE BATTERIES longer seemed worried, the man A.H.CORWIN &CO. leered conspicuously, 4 Volt 40 Amp 7.50 and the owner puffed 4West Park St.Dept. away like a man of wisdom. B 4 Volt 60 Amp 10.50 6 Volt 40 Amp 10.50 "I don't know what you mean, Mr. Newark NewJersey 6 Volt 60 Amp Johnston," said Kluge. `Please explain 14.00 yourself 6 Volt 80 Amp 18.00 more fully." "Still trying to hold off, eh, young man ?" ////1//MiIII) IiIIII I111 We do not charge for crating. The above Johnston chewed on his cigar in preparation Prices are F.O.B. New York. Above Bat- for teries are fully charged when shipped. further speech, and with a menacing grimace cried : "See here, Kluge, I'm will- RINTRODUCING THE Hygrade Electrical ing to give you a good price and a chance Novelty Co. to disappear. 41 West 125th Street New York I intend to make a large profit on this deal and I don't mind playing fair. ADIO HOOKSWITC How will fifteen hundred dollars strike you? AN D OURSELVES That's the best I can do and not a cent more." Unconditionally Guaranteed for 1 Year "You have the wrong impression,' spoke up Kluge serenely. `'What I said a few U.S. Storage moments ago, I mean. I will do nothing Batteries against the law." Supreme for Wireless Telephone This last statement enraged the two men. Telegraph, electric trains, motors, lighting toys, etc. The captain frowned and bit hard on his Pat. App. For 6 Volts 40 amp. $10.00 6 Volts 60 amp. cigar. Johnston seemed about to $ 3.75 strike the AnotherStepTowardsEfficiency 6 Volts 80 amp. $17.50 operator, instead he twisted his mouth into The 21 OTHER SIZES an ugly hypocritical semi -grin. hookswitch provides the logical resting Price place for phones, simultaneously list mailed free. Dealers write for discounts "Damn it !" swore the owner, acting as When the least money buys the best, why not decided a vacuum tube switch. save the difference. upon a course of action. "I'll 'tend to this Nickel Plated $1.25 Prepaid Mail Orders filled upon receipt of price. man, Captain. No crook can put anything Dealers write for proposition U. S. STORAGE BATTERY CO. over on me." "Yes, UNIVERSAL RADIO & MFG. FAR ROCKAWAY, N. Y. but the SOS must be sent out im- COMPANY mediately," muttered the captain. "The fog 1809 Carter Avenue New York Distributors will not last forever, Dept. H -1 BRONX, NEW YORK Broadway Electrical Nov. Douse 324 Bowery you know, and we U. S. Storage Battery Co need 4- Barclay St. it to nide our movements. I have KEEP P. M. Dreyfuss 152 Chambers St. everything ready. THE PHONES OFF THE TABLE, Dreyfuss Sales Corp 179 Greenwich St. The men will throw over Lyknu Auto Co. 606 Bergen Ave., Bronx the half- burned pieces of the lifeboat and Beacon Radio Elec. Co. ..246 Greenwich St., N. Y. other small Kensington Storage Bat. Co., 4416 18th Ave.,'Bklyn. parts of the ship when I give David Killeen. Co. 57 Murray St., N. Y. the word. We can launch the other boat Also on display and demonstrated at soon afterward." A Multi -Wave Tuner N. Y. EDISON RADIO BUREAU Johnston remained thoughtful for a mo- 15th St. & Irv:no PI. 124 W. 42nd St. ment. He glanced Tremont and Monteray Ave., Bronx at Kluge, who seemed for quite heedless of what the captain said. "You absolutely refuse to help us ?" asked the owner tentatively. $19.50 Kluge had no intention Do your own assembling, complete set of aiding the of parts: owner in any way. The man had made a mistake. Kluge had 1 10x10x% Condensite panel, drilled. T ODU3 served a term in the 2 Panel type condensers. 1 penitentiary, true, but many men innocent 1 Three coil mounting. of crime had been convicted because of cir- 1 Phone condenser. DAD cumstantial evidence. Johnston's 1 Series parallel switch. I0 offer was 2 Large terminals, tempting : it presented Kluge with a chance 4 Small terminals. APPARATUS to evade the police, but the young man did 2 Phone terminals. not wish crime to pend his struggle for Necessary screws. and SUPPLIES existence. Necessary wire. Full instructions. ROSE "I refuse to help you in any way," said RADIO SUPPLY Kluge firmly. All you have to do is to mount the parts 604 Gravier St.. New Orleans, La. on the panel and wire it up. Johnston raged internally. To have his Send 10e for Latest Catalog plan go unperfected after his labor ana a THE large bill of expenditures was too much for VIMY SUPPLY CO. the owner. 567 College Street TORONTO "See this !" he cried, drawing a revolver Send for our Price List, 5 cents from his hip pocket. "You send what we i tell you or I'll send you to hell !" The revolver served to make Kluge falter FREED -EISEMANN momentarily. His face became pale and his SPECIAL FOR MARCH RADIO CORP. hands twiched nervously. 255 Fourth Ave. New York City 7 Strand Phosphor Breeze Aerial Wire "Send the SOS !" ordered Johnston, "or per loo ft $2.00 Assembled Regenerative Realm Complete in three seconds you'll be a dead one, Federal 330 Line of and Loud Speakers 14,.00 Highest Grade Wireless Outfits I'll send the signals myself." Amplifying Transformers &60 Double Cireult Jacks and Plugs Complete The man's last statement Ne. 1.59 about sending 14 Hard Drawn Aerial Wire per 100 Send 15c in Cash or Stamps for the SOS himself brought back Kluge's ebb- ft. 22 V IB Batteries. small Instructive Catalog "N" i ing courage. It was ludicrous to think of elm LOO any person trying to send intelligible sig- NEWARK WIRELESS EXCHANGE nals unless a perfect knowledge of appa- 87 Halsey Street ratus and code was available. Newark, N. J

www.americanradiohistory.com Rauw News far March, tyre )05

"You'll never be able to send anything 10c CHARGES YOUR STORAGE yourself." Mr. Johnston," said Kluge. "II BATTERY 'wITHEM F -F BOOSTER takes a practised hand to do that." 6 So You will never have to The man was quite aware of the fact and give up in disgust when had no intention of discussing it. He knee you want the handiest working a distant station. nothing whatsoever about the wireless ap- Is it not gratifying to feel audion controls made, that all the year round paratus. nevertheless he did not intend to your Filament Battery will let his long contemplated scheme be sup- get be ready when you want it? 1 You know what it is like pressed on the nigh. it should be perfected. to have Friends call to because of operator. "LISTEN IN" and then the whim of an find Your Battery dead. "Kluge, I'll give you half a minute!" F -F BATTERY BOOSTERS G. A. LABORATORY TYPE Charge Automatically and threatened Johnston, aiming the weapon Operate Unattended. Screw with steady hand. "Captain, if you wish to Plug in Lamp Socket. Snap DETECTORS and AMPLIFIERS Clips on Battery Terminals see a man die, stay in this room.' and sec the gravity come up. If Kluge had any doubts concerning the Both Waves of curr.nt arc Rectified thru Adjustable & These units are made up in 2/ easilyRenewablelnlusibleCarbon Electrodes, which main- man's sincerity he had only to look upon by inch panels, designed to be tain a constant efficiency and last thousands of hours. the captain for corroboration. His superior 5 Also Charges Batteries right In Autos. No Skill Required. set up side by side so that as many AMMETER Shows Curren.: Flowing. eliminating Guess officer, the stub of his cigar clasped firmly amplifiers can be added to the de- Work. COMPLETE IN COMPACT SELF -CONTAINED between his teeth, looked the very picture PORTABLE AUTOMATIC CHARGING UNIT. F -F Bat- tector as are needed. Input and tery Boosters are Full Wave Magneth Rectifiers for 105- of a man expecting death to come upon a output posts are arranged to be 125 Volt 60 Cycle A.C. Current. PRE -WAR PRICES. fellow being: perspiration oozed from the Bantam Type 6 Charges 6 Volt Battery at 6 Amperes $15 clipped together, with the battery BantamType 12 Charges 12 Volt Battery at 5Amperes $15 captain's forehead, his face was ghastly connections to be joined in paral- Type 166 Charges 6 Volt Battery at 12 Amperes..$24 pale and he leaned away from Johnston. Type 1612 Charges 12 Volt Battery at 7 Amperes. $24 lel at the rear. G. A. Laboratory Type 1626 Charges Both 6 and 12 Volt Batteries $36 fearing to hear the roar of the revolver at Type controls are guaranteed to The Larger Types are for heavy batteries. or where any moment. time is limited. Shipping Weights 12 to 15 Pounds. give louder signals with less dis- Order from your Dealer or Send Check for Prompt The seconds passed. For a few moments Express Shipment. If via Parcel Post have remittance tortion or howling than any others include Postage & Insurance Charges. Or have us ship vague thoughts flashed through Kluge's at any price. If you find that they Type desired C.0.1).0thrr F -F Battery Boosters Charge mind. There came before hfm vivid pic- Batteries from Farm Lighting Plants & D. C. Circuits. don't. send them back and your For GROUP CHARGING use our Full Wave, Automatic tures of his past life : his mother's kiss as money will be refunded. F -F ROTARY RECTIFIER of 100 Volt. 36 cell capacity. Remem- she sent him to school, the good woman ber to put a o.00t mfd. condenser Order Now Or Write immediately for lying upon her death -bed, his trial for Free BOOSTER Bulletin No. 32 or grand across the first amplifier input ROTARY Bulletin No. 32A. larcety and his term in prison. "Always when used with a regenerative re- obey the law, my boy." his mother had said ceiver. Diagrams for connecting THE FRANCE MFG. CO., age" hIo °óS.lt. during her last moments, "and you will be CanadianRep :BatteryService &SalesCo., Hamilton,Ontario will be found on the tender sides rewarded." of the bases. ITt had determined to strictly comply with On the detector and amplifier her advice, and when he had been most units, respectively, happy in a position of honor, he was con- The age victed of a crime he did not commit. Why Prices $5.95 foc and not take the fifteen hundred dollars Johns- are & $13,95 20et ton offered him and escape the death which now faced him? The police would think 88 -N Park Place him dead, he would no longer suffer their The General New York City continued vigilance. Send 1Oc for the new Why not? : \gain he saw the picture of Apparatus Companyom P an Y G. A. Catalog WIRELESS his mother upon her death -bed. Like a bolt of lightning an idea flashed through his mind. Johnston had started to count off ,' TELEPHONE few BROAnt-AsTING stations are now the remaining seconds. in r.perat ion at Important cen- "Twenty -four, twenty- five," the man was rs all over the county. You ran nearing the allotted time, and as he spoke AMATEURS LOOK s`. ly rerelve these l.trrestin ; daily nmts with an ABC wireless receiving his pressure on the trigger became harder. IT. ABC UNITS came to you ready -le- "Hold it, for God's sake !" cried Kluge. ate and romplete In every detail. They Radio 9XAB are built on the sert lanai system. so that "I'll send anything you want!" ryou can increase The range of your station Johnston lowered the revolver. The cap- at any tinte. We are the authorized jobbers in Ask your radin or electrical dealer about tain sighed with relief and wiped the per- the following States, (Missouri, titis and other exclusive features of ABC spiration from his face. UNITS. if 1w cannot supply you. send Kansas, Nebraska, Oklahoma, Tex- us his name and address and cu rlose ten "Make it fast, then !" demanded Johnston. as, Arkansas, Louisiana, Iowa, Ari- cents. for your copy of our l',oklet, "How "Does your offer hold ?" asked I Tut tip a Complete Rosin Station in still good zona) for Radio Corporation prod- Two ¡lours." Request Booklet 113. Kluge, playing for time. ucts. Largest stock west of Chi- JEWETT MFG. CORP. "It does," said the owner sharply, but his cago. Always fresh. We also carry 21 E. 40th St New York City voice held a menacing threat which bode ill all standard makes of apparatus. for the wireless operator. "Make it snappy!" Listen for our 250 watt phone set, "Just send the SOS," ordered the cap- 11:30 A.M., 2:00 P.M., U. S. Gov- tain. remembering that he had said nothing ernment Markets and Weather sent \... for some time. "When some ship answers out on above schedule. Concerts at tell him the whole ship is ablaze and you 7:3o and 8:3o P.M. Dealers write just got the apparatus into working. Here's us. BARGAINS UNEQUALED the position you're to give him." The captain thrust a paper forward: WESTERN RADIO CO. Kluge glanced at it and observed that the CHICAGO latitude and longitude was correct. 6 WEST 14th ST. "Why the correct position ?" he asked. KANSAS CITY, MO. SALVAGE somewhat puzzled. "We're to lower a boat in this vicinity." STOCK the captain informed him. "also there will be plenty of evidence of the ship's destruc- ç RADIO CLUB PINS STORE tion around here. We'll he many miles üJ0 Radio Clubs Everywhere e special away before the rescuers find Mr. Johnston 9ga,0 club Dln. Na make them to order, and part of the crew, and by that time we cataba 509 So. State Street 48 pages showing desig$nls of Radio. School will be S. S. Tirso, flying under the Span- te-nal pins and rings FItEE. Samples loaned ta Chicago, Illinois ish flag." officer,. METAL ARTS CO.. INC. Complete line of "Never mind the explanations," muttered 7755 South Ave. Rochester, N. Y. the owner, "we have wasted enough time already. Start her up." RADIO GOODS He motioned to Kluge. The operator intended to play a hold game. He placed the Panels for Your Set Write for our attractive telephones upon his head and tuned his re- Black fiber, 7 x 20 X %4, $2.00; suitable fer regenerative set, or eut to your alts at MAI'/as Price List ceiver for incoming signals. He then per square Inch. This material 1s Inexpensive, easy to work and listened intently. : Luck was with him he takes nice finish. heard the loud clots and dashes of a ship MAGNET WIRE AT LOW PRICES We pay postage station. The vessel could not be many ECONOMY RADIO SUPPLIES CO. miles away. £32 Sanford St. East Orange. N. J.

www.americanradiohistory.com 906 Radio News for March, 1922

"Hear anyone ?" questioned Johnston. "Yes, a ship far away," lied Kluge, "must Distr ct Southern Amateurs! Di ct be at least ten hours from us." "Just about right," exulted Johnston, "but YOU HAVE REAL RADIO SERV- to make sure no one is nearer send out a ICE AT YOUR DOOR! TRY US general call on very low power. Sign with ONCE AND BE CONVINCED. the Spanish call letters." ALL ORDERS SHIPPED SAME Kluge did as directed, except that he DAY RECEIVED! WE CARRY signecr the call of the S. S. Midway. The THE MOST COMPLETE LINE signals could be picked up on an ordinary IN VARIO!MMETERS ì+ THE SOUTH, STOCKING ship receiver about thirty miles. VARIOCOUPLERS a EACH PRACTICALLY A L L GOODS "Any answer ?" 3.65 SHIPPED iMMEDIATELY FROM STOCK LISTED IN THIS MAGAZINE. "None," lied Kluge, for the second time. our low manufacturing costs enable us to make these A FEW OF OUR SPECIALS! The vessel had answered his call. This was prices. Best workmanship and material are used. Switch points, Brass Doz. 250 sufficient evidence that it was in the vicinity. These instruments are perfect in construction and Switch points, N. P. Doz. $03 "Send out the SOS now!" ordered Johns- design. All parts accurate. Easily mounted on Binding posts, Brass Es. 8o panel. Coupler primary has seven taps. Effective Binding posts, N. P. Ea. 90 ton, "and use full power." tuning range 180 to 600 meters. Stake your own h'ghly efficient regenerative set with a loose coupler, Seven strand aerial wire, 120 feet 60+ The young operator, already decided upon 4 -inch strain insulators 500 two variometers and necessary parts at a very low 3%-inch bakelite dial $1.00 a course of action, thrust in the transmitting cost. RAC -3 Universal Audlon 5.50 switch and called the vessel he believed to Radio panels cut to order, smooth sawed edges. Formica panels cut to order, Sq. In 2n We cut them exactly to size and ship the same Jewell Thermo-Couple Meters be within thirty miles of him ; he had no day your order is received. 'h" thick $0.01í/c per Antenna ammeters 12.00 intention of sending false distress signals. square inch -for more information on radio panels A. C. Voltmeters 8.00 see our add in the wireless column of opportunity D. C. Milliammeters 8.00 His call was answered immediately. ad -lets. "Now We carry the best in C.W. send what we told you," ordered and Phone equipment; let us Johnston, when informed that a distant ship, RADIO INSTRUMENT & PANEL CO. give you an estimate. the S. S. Wilde, had answered his call. Box 75 CICERO, ILLINOIS DISTRIBUTORS FOR: Amrad, Clapp -East- Without deliberation Kluge sent the fo -- ham, Murdock, Render, Federal, Magna- lowing message: vox, Chelsea, DeForest, Firco, Acme, Ace, "Ordered to send false calls. Radio Corp'n, Tuska, Turney, Grebe, distress RAC -3 Jewell, Westinghouse. Plot to obtain insurance. Name of vessel to be changed to 'Tirso.' False story of Southern Radio Supply Co. ship's destruction by fire to be told by owner and of crew. Box 550 ST. PETERSBURG, FLA. part Vessel supposed to be abandoned immediately; only one lifeboat to AUDION put off." (Here Kluge transmitted the lati- RECEP- tude and longitude from the written sheet $3.50 TACLE given him by the captain.) "Can say no snore, life is in danger. Operator Kluge.' can he $1.00 "Good," said Johnston, after the young used as man had finished. "You'll be paid at the SEND Canadian Amateurs first safe port." Then to Detector turning the cap- FOR tain: "Come, carry out the plans in full." or LOOK! The two men left the cabin. Amp1if er ONE A few moments passed, and the single light which illuminated the cabin suddenly went out. The owner was taking no chances with Kluge. The current for his transmitter had been cut off. The young man felt that the vessel was being stopped. The fog -horn was silent, and a commotion could be heard on deck. Half Size No doubt false wreckage of the ship was being thrown overboard New Jersey Radio Equipment & Installation Co. and the lifeboat 120 BIDWELL AVE. JERSEY CITY, N. J with the owner and part of the crew as oc- cupants was about to be launched. A 3 -Coil (Mounting) to flt a standard Honeycomb A half hour passed in this manner. Kluge toil Plug for only $5.00 not Condensite Moulded Plugs for Coils 65e dared leave the shelter of the cabin. Fabre Plugs for coils 40e There was no telling what might happen to - Send for our large illustrated catalogue. him if he went on deck. Post Paid J. M. PAQUIN He remembered that he could stir use his THE ELECTRICAL SHOP receiving set, and he tuned for incoming Anywhere 787 Queen St., W. Toronto, Ont. signals. The S. S. Wilde was calling him. Its operator signed the proper call letters and then sent the following message: "Coming full speed ahead, making fifteen Radio Supplies knots per hour. Captain under suspicion for of Standard Makes like case. Commander." Kluge gave thanks to God that his mes- BAKELITE PANELS sage had been received and considered im- CHAS. G. ROSEWALL portant enough to caul- a passenger liner 93 Flatbush Ave. to swerve from its regular course. He did CUT TO ORDER not know that two United States Inspectors Brooklyn, N. Y. 3/56" thick ...o2c square inch had been in the wireless cabin when the message received and %" thick .02 %c square inch was that they were quite instrumental in determining that the We also carry a complete line of S. S. Wi.'de should investigate. RADIO APPARATUS magnet wire, tubing, radio outfits If he could only communicate with the Send for our latest price list. We pay and parts. speeding passenger liner. He must have a transportation charges anywhere in United light: a spark coil could then be connected States. MAIL ORDERS PROMPTLY and used for transmitting. ASHTABULA RADIO A candle was near at hand. He lighted SALES CO. FILLED it, and as the flame flickered he realized 49 McGovern Ave., Ashtabula, Ohio DEALERS. -We distribute for all that the steamer was again moving. No leading manufacturers. Write for doubt the captain was in a hurry to get out price list and discount schedule. of the vicinity. The commander had excellent reason for AMRAD AND GREBE SETS calling for full speed. The fog now showed PITTSBURGH RADIO AND every sign of lifting. Although as far as Special Prices This Month APPLIANCE COMPANY, Inc. he was concerned his vessel was now the S. S. Tirso, the captain was taking no MASSEY RADIO COMPANY 112 Diamond St. Pittsburgh, Pa. chances on being near the scene of the res- The Radio Store Winchester, Virginia cue of the owner. The new naine had not

www.americanradiohistory.com Radio News for March, .1922 Ü7 iiparial yet been painted on the ship's side. Ten minutes passed and Kluge was ready S. to again communicate with the rescue ship. U. STORAGE It was necessary that the direction of the S. S. Midway should be known by the other BATTERIES ship. Kluge determined not to risk the use FOR WIRELESS USE of his pocket compass. He would casually walls into the pilot house and observe the Special Prices compass there. Volts Amps. Price A soft step sounded without. Someone 6 20 $7.25 was approaching the radio cabin. Kluge ex- 6 40 9.75 and tinguished the dim flame and waited. He 6 6o 13.50 Variometers had neglected to lock his door ; it was sud- 6 So -loo 22.00 Couplers denly thrust open, and in the dim passage- One year unconditional guarantee, way he recognized an Italian seaman. free repair or a new battery at our $4.50 "What do you want in he " shipped fully charged, ready to finish his question. option, These instruments embody best workman- Kluge had no time for use. ship and materials, all wooden parts genu- The intruder sprang forward, a long mur- ine mahogany, coupler primary wound on derous weapon within his hand. The young Add $.5o for special crating. maxi- Formica tubing. Wound to assure operator dodged the first flash of the keen Distributors- Jobbers- Dealers -write for mum results for short wave work. Shafts discounts and exclusive territories. If 3/16 inch. With Chelsea Dial and Knob, steel. your dealer hasn't it, send check or $1 extra. Send for bulletin describing So this was the price he had to pay for money order direct. panels, parts and other apparatus. casting suspicion upon himself. Johnston P. M. DREYFUSS had hired a man to murder him. Kluge's Fourth Floor FREDERICK WINKLER, JR. upon his ability ,to grasp the life depended SL New York City 304 Columbus Ave., New York City, N. Y. vicious weapon, and he determined to fight 150 Chambers until the last ounce of strength had left hint. Again the Italian sprang forward. The man's stroke was powerful enough to send THE GOODMAN the blade through a thin wooden wall. PAPER Kluge dodged again, but this time he was not quick enough. The knife pierced his shoulder, and the operator fell back hitting his head on the transmitting panel. He TUBES dropped to the floor unconscious. FOR WIRELESS The Italian stumbled over him; the man's hand fell upon the transmitting key, and ALL SIZES ON HAND the shrill tone of the spark coil frightened FOR IMMEDIATE DELIVERY the ignorant seaman. The spark lighted the the operator WHOLESALE & RETAIL PENDING room momentarily, and noticing RAiI.NT the floor, a sudden fear lying prone upon BAEKM PAPER CO., INC. came to the murderer. 6.00!!! His only thought was to get away from 219 Fulton Street New York which he did in haste. Coming the cabin, Bet. Church and Greenwich Sts. Nuff Sed on deck he heard the captain swearing. Send for Pamphlet The ship was disabled; the propeller was the vessel must wait for MADE AND SOLD BY useless and help. . . L. W. GOODMAN consciousness he was Drexel Hill, Pa, When Kluge gained cognizant that he was amid new surround- WHOLESALE DISTRIBUTORS ings. He heard the voices of two men near CO. THE SAYRE-LEVEL RADIO him ; he had a dim recollection of convers- 905 Filbert Street, Phila. Pa. ing with one of them before. Order direct or from your dealer "Only a slight wound," a physician was no doubt speaking, "it was the knock on the head that put him out." COMPARE OUR PRICES "A brave lad," the second man said, "I'm sorry now I refused him a position some MAGNET WIRE time ago. I readily thanked the detective B &S sac for telling nie he was a crook to De Enamel 1 lb. % lb, ¡q lb. 1 lb. % lb. % lb. avoided." 22 .78 .44 .25 .95 .52 .30 the first 24 .89 .49 .28 1.05 .57 .32 "Was he an ex- convict ?" asked 26 .99 .54 .31 1.21 .65 .36 speaker, surprised. 28 1.06 .59 .33 1.36 .73 .40 believe he is innocent of the 1.70 .89 .48 "Yes, but I 30 1.13 .62 .34 which he was convicted. He told Prices on other sines and Insulations are cor- crime for so the time. I have a fine position respondingly low. me at here is the switch arm you have been waiting he becomes well. . . ." We also manufacture a Superior Receiving for that man after for. Substantially built with large commercial Set, Treated Tubes, for Tuning Coils, etc, The passenger liner S. S. Wilde continued type knob 1 in. diameter, nickel plated switch nearest Ask for Reel Easy Products Copyrighted. with all possible speed toward the arm with 1% in. radius. Well built and very port with the S. S. Mildzvay in tow. handsome. I. R. NELSON COMPANY his associate, the captain, TYPE R -2 SWITCH ARM 50c NEWARK, N. J. Johnston and be in prison, together with one would soon Complete radio receiving outfit including aerial Italian assassin. equipment, receiver, 1,000 ohm headset, ground clamp, switch, instructions, etc. That Will The Buzz MARVEL OUTFIT, COMPLETE ...... $15.00 A DIO C Father -And what is this little block with We handle only the things that are really the two wires connected? MC MAHON RADIO SUPPLY CO. worth while in Radio. Receiving and Son that's the "B" battery. transmitting apparatus desirable for Spark, -Oh, 56 West Ave. O.w. and Phone. Strictly high grade. Father -So that's where you obtain the Try our service. For 60 years identified are always talking about. South Norwalk, Conn. with telephone and electric development in "honeycombs" you the Northwest. Write us. By RUPERT F. STARLING. Mlohtaan st.. 1. Andrae & Sons Co. Milwaukee,117 Wia. Poor Capacity TALKING MACHINECONNECTORS that choke coil amplifier" a RADIO- "Build Kate -"That new preacher must be Try the E.S.X. attachment from any type receiver to The famous Meyers RAC3 Audions, $4.75. Bases poor one." any make talking machine for loud round tone, any $1.50. Clips for panel mounting instead of base, ?" stage of amplification O. K. 50e per set. Amplifier coils $4.50. We carry Duplicate -"Why PRICE THREE DOLLARS complete stock Amateur supplies. Send stamp for Kate -"Why, the first couple he married Order from us or' dealer. Mail orders promptly filed. list. got a divorce." must he a loose UNITED STATES ELECTRICAL CO. WESTERN CANADA RADIO SUPPLY Duplicate-"Humph! Wireless Telephone Division. Only exclusive amateur house in coupler." Radio Construction Engineers Western Canada Victoria, B. C. By ROBERT I.ISK. 109 Flatbush Ave. Extension BROOKI es. N. Y.

www.americanradiohistory.com 908 Raaio [l'ews for March, 1922

.,,,J CVO ....wAUItUI.... Watt ,.4,.,, J.IIVIw.vdLtl tu .E ., OPPORTUNITY AD -LETS Follow these advertisements every month. Reliable advertisers from all over the country offer you their most attractive specials in these columns. Q Classified advertising rate ten cents a word for each insertion. Ten per cent discount for 6 issues, 20 per cent discount for 12 issues. Name and address must be included at the above rate. Cash should accompany all classified advertisements unless placed by an accredited advertising agency. No advertisement for less than 10 words accepted. Objectionable or misleading advertisements not accepted. Advertisements for the April issue must reach us not later than March 10. E THE CIRCULATION OF RADIO NEWS IS OVER 105,000 g EXPERIMENTER PUBLISHING CO. INC., 233 and 236 Fulton Street, New York, N. Y. ( íW1C111if fl ItrotYî rrii9fYíl î î î î IYYIIY YQY 11Iri14 11tY ware YJfIlY IYi rYd l1 IYdt/ nu a 1fYA1

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Sasnett, former examiner in electrical and optical divi- ,11111111111111111: 111111,11: 111111111,11, 111, 111111111111111111 1111111111111111111111111111111111u11u11 sions of the U. S. Patent Office, ex- Principal Examiner Be a Mirror Expert, $3 -$10 a day; spare time home at U. S. Patent Office, McGill Building, Aeronautics. first; no capital; we train, start you making and silver- Washington, D. C. ing mirrors, French method. Free Millions Spent Annually for Ideas! prospectus. W. R. wanted! Hundreds now Model Aeroplanes Derr, Pres., 579 Decatur St., Brooklyn, N. Y. Patent yours and profit! Write today for free. that Fly. -Buy your complete outfit, books -tell how to protect yourself, scalp drawings, fittings compressed air motors and Detectives Earn Big Money. Excellent opportunity. how to invent, ideas. all-best wanted, how we help you sell, etc., 301 model aeroplane supplies from the Wading River Manu- Travel. Experience unnecessary. 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Complete Photogra- send for free copy of our current issue, It contains phic Formulae and advice -One Dollar. Photographic In- helpful, instructive information stitute, Dept. 3, Wedgeway on overhauling, ignition Learn Chemistry at Home T. O'Conor Sloane, 1111, Buildin g, SchemeSc ctady, N. Y. troubles, wiring, carburetors, storage -Dr. .. batteries, etc. Over noted educator and scientific authority, will teach you. 120 pages, illustrated. Send for free copy today. Auto- Our home study mobile Digest, correspondence course fits you to take Phonographs -Supplies 528 Butler Bldg., Cincinnati. a position as chemist. See our full page ad on page 839 uluuu11111111111uu1n11111u1111un111111 of this issue. Chemical Institute of New York, 140 Wonderful Bargains in Phonograph Cabinets, Everett Liberty Street, New York City. Factory, McHenry, Dl. Books. ,,,,,, 11111111111111111111111111111111111111111111111111111111,11, 111,11111111111, 1111,1,1 11, 111 1, 1111,11111111111111111111111111 Play Mouth-Organ.-Complete, easy instructor, 25c. Sex Books for Adults.- Illustrated catalog, 4c. Sme- Elsea Co., Bowling Green, Ohio. Personal. tana & Co., Dept. 10, Owosso, Mich. We Buy and Sell back issues of Radio Amateur News Magic Words. Amazing, sure method of obtaining your and Electrical Experimen!er. Boston Magazine Exchange. Musical Instruments desires. Postpaid for dime. Smedley, 145 Stiller, Brook- 109 Mountfort St., Boston, Mass. lyn, New York. Cornetists, Trombonists, 1 11111111111111111111111111, 111,11111111111111111 Investors and Saxophonists, Clarinetists, send ,111111111,11.11111nn11111111 111111111111111111111111 ,11,1111111111 Traders, Forecast your own markets. for "Free Painters ", mention Don't trust to luck. Use method. Amazing new book instrument. Virtuoso gives School, Buffalo, N. Y. Scenery for Hire. best system yet discovered. Eye opening folder iiiimilimiimmuulummiliiimesgumummummumultrummtilitmmumilitimimminturrnmonmo free. Dept. "F". Master Market Forecaster C'o., Topeka, Kansas. Miscellaneous. Settings for all operas and plays. Catalog. Amelia "Schemer Grain, Philadelphia. Magazine." Alliance, Ohio, prints big profit 1111111111111111111111111111 1111111111111111111n111111111111in ; Luminous im 1:u,11ä schemes one subscriber making 25,000 from three ; an- Paint. Bottle 20c. Laboratories E, Box 316, other 10,000 from one. Try your luck. Year, only $1.00; Portland, Oregon. three months, 25e. n111111111111111111111111111111111.11.111111111111111111111111,1111111111111111111111u11111111111111111111111111111111, Song Writers. ,11111111111,,,111111tum 1,11111111111111111 1111111 11111111111111111411,1111111,1,111111:11111114 Health. Song Writers! -Learn of the public's demand for songa Batteries suitable for dancing and the opportunities greatly conditions offer new changed Tobacco or Snuff Habit Cured or no pay; $1 if cured. writers, obtainable only in our Storage "Song Writers' Manual Batteries, 6 volt, 15 amp., $3; 40 amp., $6; Remedy sent on trial. Superba Co. , SB, Baltimore, Md and Guide, sent free. Submit 120 amp., $10. Also batteries for farm lighting. H. your ideas for songs at once for free criticism and ad- W. Barraclough, 3649 N. Tenth St., Phila., Pa, Pyorrhea (Rigg's disease-bleeding or swollen gums) - vice. We revise poems, compose music, secure hundreds have been helped by "Pyorrdent" the success- and facilitate free publication copyright Wolfe's "A" Battery. Filtered insulation or outright sale of songa. get better ful home pyorrhea treatment. Purifying, healing, pre- Knickerbocker Studios, 319 Gaiety Bldg., New York. current for your tubes, write me. :111nn111111111nu,1mn,1,1111111 Thos. J. Wolfe, 318 ventative. Full month's treatment, consisting of a very 111111111, 1, 1, 1. 1,,, 1, 1, 1,,,,,, m,,,,111,111111,111111111111111111 W. College, Independence, Mo. beneficial massage paste and an antiseptic tooth -cleansing Edison Storage Battery elements for B batteries. Prac- paste to be used in place of your ordinary dentrifice, Stamps and Coins. tical for transmitters and receivers. 20 pair, $2; 40 together with full directions for treatment. $1 postpaid. pair, $3.60 60 pair, $4.S0; 80 pair, $5.60. F. L. Or. write for free booklet "R." Pyorrdent Mfg. CO. All Different; fifty British Colonial 439 Stamps, 25c. O'Brien., 115 W. 104th St., New York City. Seventh St., Brooklyn, N. Y. African Packet, 25c. Robert Edgerton. Box 2038, 111111111111111u11 111111111nu1u111111111111111111111111111111111111111111111 11111111111111111uu1111uu11111 11111111111 Fresno, California, Men -Are you interested in your health? Keep well 20 Different Unused Stamps Free! (2e Business Opportunities. by preventing disease in time. Postpaid, sealed, with applicants for 60% discount postage) to full directions sent for $1. Send for free circulars. Na- approvals. 1000 varieties without U. S., $3.50. Money, 188 10th Ave., Advertise. -30 words 100 magazines, $1.50. List free. tional Specialties, 1132 Union Square, N. Y. C. Ohio. Columbus, Pennell Company, Covington, Ky. .1,111111 S11n11111111n1111n u1u111nn111n 111111111111111111111111n1111111111111u11u111111nu111,1111 n1u11111n1n1m111111n111111111nuunnu111101111111nnnnlnnnu11n1uun 1111 u11 u111nnu1nn11n, Choice Minnesota Wild Land, at sacrifice for cash. P. Fonos. New Richmond, Wis. Manufacturing Wireless. Get in Business Yourself; $4 buys marvelous Keystone Economizer. Easily attached to any make car and saves Patterns, Wood and Metal Models, Tools and Dies, Storage Batteries. Be a battery man. We have alI 25% to 50% present fuel consumption. Satisfaction Brass and Aluminum Castings,- General Machine Work. material and can give instructions for making them. guaranteed or money refunded. Agents make big money. Write Modern Machine & Pattern Co., Terre Haute, Ind. Sample Plate - 40e. Foreign countries 50e. Windsor Address Keystone Economizer Company, 323 Stock Ex- n1111111111111nmun 1111111111uunuluuu uun111111111111111u1n11111111111 n 111111111u111,111111111111 n n 1 Specialty Co., 5419 Windsor Ave., Chicago, Dl. change Bldg., Los Angeles, Calif. News Correspondents Special Offer. Genuine Condensite Celeron Panels, 6 x 14 x 3/16 ", $1.85; 6 x -21 x 3/16 ", $2.75. Special Earn price on other sizes on application. Receiving apparatus Chemistry $25 Weekly, spare time, writing for newspapers.. built to order from your specifications magazines. Experience unnecessary ; details free. Press at prices you can Syndicate, 566 St. Louis, Mo. afford to pay. Special prices on Amplifying Transformers, Learn Chemistry at Home T. O'Conor Sloane, noted etc. Get -Dr. 1111111111111111, 1111111111111111111111111111,1,111111111111111 111111,11 1111111111111111111111111111111111111111111111111, our prices on all worth -while apparatus. Quick educator and scientific authority, will teach you. Our shipments and everything Postpaid. Washington Radio home study correspondence course fits you to take a Shop, 764 Gresham Pt, N.W., Washington, pcsitien as chemist. See our full page ad on page 839 Office Devices D. C'. of this issue. Chemical Institute of New York, 140 Radio Frequency Resistance Amplifiers 48000 ohm Liberty Street, New York City. Multigraphs, Typewriters, Addressing Machines, Dupli- Lavite" units, 40e; signal corps condensers 0.003, cators, Folders, Sealers, Check 0.004, 111111.11111111111111mnm.1.1 111111111111111111111mm 111111111 11111111111111111111111111. Writers,' Dictaphones. 0.005, 0.01 microfarad, 40e each; W. E. 7 terminal Office Equipment. Bought, sold, exchanged, rebuilt. filament control jacks, 75c; with plug, $1.15; 2000 volt Correspondence Courses. Pruitt Company, 110 North LaSalle, Chicago. mica condensers, 0.32 mfd., $1.50. Sold for $8 wholesale. 11111111111111,111111 ,111111111111::11111111111: 11111111111 11111111111111,,,,1111 ,111111111,1111,111111111,,,,,, ,111111111111111, See our advertisement in Practical Eleetrics, Western In- Used Correspondence Courses Wanted. -All schools, all strument Repair, 314 N. Fairfield, Chicago, Illinois. subjects. Liberal prices Printing. paid. Courses bought, sold or Taps at 3e; headbands, 80° phones, Radio keys of exchanged. Lists free. Students' Exchange, 1966 Broad- reliable make at 30% reductions. Solomon Schifshick, way, New York. Station Cards, SI per 100. Carl Schumacher, St. 209 Seigel St., Brooklyn. Cloud, Minn. Dollars Saved-Used correspondence courses of all kinds Attention! -50 Vacuum tube hook -ups. The greatest sold, rented and exchanged. List free (Courses bought.) Good Printing Quick. Gummed labels. Samples free. collection of vacuum tube circuits ever brought under Tee Mountain. Pisgah, Alabama. Pennell- Standard, Covington, By. two covers at such insignificant cost. These diagrams Correspondence Courses at less than half original price. Everything Printed. -Lung run specialists. Samples will be found in the great " Rasco catalogue, which con- Any schonl; any subject for men or women. Bulletin finality Printery, Marie'ta, Ohio. tains raw materials and parts in a greater profusion 1074 free. Courses bought. Instruction Correspondence than any other catalogue. 15c in stamps, or coin. will Your name on fifty "Styloprint cards " 35c. Card bring the catalogue to you. Radio Specialty Exchange, 1966 Broadway, NOV Ynrlc case FREE. Imprimature Press, Waltham Mass. Park Plc^- -" v, Co. 96 -98

www.americanradiohistory.com Nadi News for March, 1922

(Wireless continued) (Wireless continued) (Wireless continued) .00 ft. No 16 Aerial Phorf eras Bronze Wire, mailed, I Grebe! ! ! NoLce. the attractive pre- Build Your Own Synchronous Gap and save money. Grebe! Grebe! $1.50. Experimental wire. Ralph Brandt, Trenton, Stahl Rectifier miums the utter for a Smiled timo on the latest Grebe :Synchronous motors at very low prices. Bakelite Company, 1405 W. Jackson Blvd., Chicago, Ill. regenerative sets and vacuum tube controls. units, and vernier controls. Type Premiums. -The Radio Ma: naves as variometers, shielded Set. All necessary parts for as- Kohler Magnavox -3, $65 ; Premium 1 pair Type C Baldwin phones, Short Wave Regenerative loud whirls will repro- C.R. d x 1S is well known is the only speaker 512. Type ('.R. -S, $S0 or Type C.R. -5, $50; Premium sembling shot wave set, $30. Includes formica duce rad:o telephone spetich and wireless music in any phones. Type C'.R. -9, $130, panel, Render variometers and tube. All new stock. within] t injury to the 1 pair Type C Baldwin volume, without distortion and choice of Itadiotron or A.P. detector conibiued Circular containing other bargains on request. B. & B. Type It-3 radio nnagnayox, with 14 -inch horn, premium apparatus. with 2 Radiotron or A.P. Amplifiers, a complete set of Radio Co., 507 Bigelow, Peoria, Ill. iunt 1 A.1'. or radiotron U.Y. 201 $45; input 5-watts, pram BORD detector and 2 stage amplifier, $75, 2 largo size Ace 45 -volt tubes. Type V.P. anion tier. $6.50 each, or of either 2 A.P. or radiotron V.T. One -Half K.W. Transmitter, using Acme Transformer, It -2 Magnavox with large prcnniums choice block batteries, $1(1. Type Amplifiers. Type ROI: 2 -stago amplifier. $55, premium Dubilier condenser and Super- Benwood gap, $50 F.O.B. $100. Input 20 tvatts, premiums 2 A.P. or radio - Abso- Mass. Isom, size choice of radiotron or A. P. V.T. Amplifier. James M. Hollowell, Jr., Chestnut Hill, trml IT V. 201 amplifiers, $6.50 each or 3 large guaranteed to be, up to the extreme and dis - lutely new stock and Ace 45 -volt block batteries, $15. For well-known Grebe standard; without question the Orders Shipped Day of Receipt. New price list just of radio telephone speech and usual the tortionless amplification used. finest regenerative sets on the market represent.ng out. B. & B. Radio Co., 507 Bigelow, Peoria, Ill. Husks the n agnavox power amplifiers should be Kehler Radio Typo A.C. -2, Model last word in ]radio Engineering. 'Tite Magnavox tiro -stage power amplifier, Laboratories. Dept. R., Abilene. Kansas. Clapp- Easth am H, K.W. HS'tone Set, $70, F.O.B. premiums 2 A. 1'. Type C power tubes at $7.50 C, $80, 3- with Bakelite top, James Al Hallowell, Jr., Chestnut Hill, Mass. or 1 Everready 100 volt block battery, $15. Variable Condensers. -Assembled, each Pre- scales; 23 plate, $2.95; 43, stage power amplifier Type A.C. -3 Model C, $110. bottom, knob, pointer and tubes, each. $3.95. Knock clown, $1 less. Also separato parts sold. Amateurs! Biggest Thing Today! Chokes for radio mium 3 A.P. Typo C lower p 84 $1.25 st $ . 0 B. Plato samples, ile. Postage prepaid. Gravenstede, frequency amplifiers! With simple hookup, only Backed by our usual guarantee. postpaid! Act now! Max Shapiro, 630 Howard Avenue, either Oakland, California, New York City, or Abilene. Hancock Ave., Jersey City, N. J. Dept. R, Abilene, Kansas. Brooklyn, New York. The Kehler Radio Laboratories, quickly Memorize Continental Code in one hour. Qualify Bought and Sold. We buy used 894 this issue. Wireless Apparatus Boys! Don't Overlook This. The "Basco" Baby De- for amateur license. See our ad on page apparatus. Amateurs call and see us. Wireless Devel- ever brought out wills molded C. K. Dodge. tector. Greatest detector in opment C'a, of New Jersey, 634 Gordon St., Hoboken, base. Fully adjustable. See former advertisements N. J. this publication, or our catalogue. Detector with Galena Radio Bargains -50c each postpaid. Phone plugs; 3 the some detector open or closed circuit; re- Crystal, complete 50c, Ra incite contact jacks, work either Unwired Regenerative Set, $15. F. O. B. James M. Crystal 75c prepaid. for r to-day. lighting arresters, carbon gap with high New York City. ceiving station Hallowell, Jr., Chestnut Hill, Mass. Specialty Company, 96 -98 Park Place, voltage fuse, on porcelain base, $1 value ; Bakelite 3" diameter tubing, per foot ; Ward Leonard resistance Clapp Eastham, DeForest, Acme, Fire°, alloy wire re- Variable Condensers and Parts.- Assembled for Panel Order Murdock, tubes, up to 2000 ohms; non- inductive 23 $2.40. Rugged con- Radio Corp, Amrad and Westinghouse apparatus from spools, any resistance up to mounting 43 plate, $3; plate, sistance units on wooden struction unassembled 43 plate, $2.25; 23 plate, $1.90. Itocheleau's Store, Baltic, Conn. 2000 ohms; six feet No. 5 ground wire flexible 61 C. Plates stationary 03; rotary, .025. Washes stationary, C. ; postage not paid on wire. D. C. snakes strand It. 20c doz; rotary, 30e doz. Shafts complete, 43 plate, 40e; Used Radio Apparatus of standard purchased, Enam. No. 14 copper wire, 40c pound. Miscellaneous. us your apparatus prepaid, we will snake you an for panel mounting with 23 plate, 35c. Bearing top and bottom, 35e. Brandford send bargains-change-over switches, Conn. offer if you accept, our cheek trill follow; if you reject, T., $2 earls; Sena, 2 P. D. T., $1; Radio & Manufacturing Co., Brandford, Send list highest knob, six pole, D. the will return same to you prepaid. same, single pole D. T., Soc; Wheatstone Bridge resist 41 S. Orange - prices paid. The Radio Shop of Newark, 6 circuits, $4.50, F. O. B., Honey -Comb Set. Triple coil -mounting, series shunt once boxes, with plugs, leak, secondary and grid con- Ave., Newark, N. J. Chicago. Twelve hour service on all above. American switch, grid and primary, Radio Supply, 2140e So. Harding Ave., Chicago, Ill. densers mounted on bakelite panel, with oak cabinet. and Act! V.T.'s and accessories! -With James M. Hallowell, Jr., Chestnut Hill, Mass. Stop! Lock! Per Cent. off on Racliotrons. Burgess large B' each of the listed tubes Radiotron U.V. 200, $5 and Ten new $6.50 and A. P. batteries, $2.50. New Radio Magnavoxes, $39; Railway Ac- A. P. detectors, $5; radiotron U.V. 201, Write for list. Radio Telegraphy- (Morse and Wireless) and We will supply free of charge your Clapp -Eastham HR sets, $31. niunting taught thoroughly. Big salaries. Great op- amplifiers, $0.50. Company, Weedman, Ill. choice of either of these five premiums -latest Fada Supply portunities. Oldest, largest school. All expenses low- Bernier smooth running rheostat, is Real Panels cut to order, smooth can earn large part. Catalog free. Dodge's Institute, rheostat, $1, No. 810 Thls Service.- ship $1; Paragon V.T. socket, $1; Murdock V.T. socket im- sawed edges. We cut them exactly to size and M St., Valparaiso, Indiana. $1, or 'Crosley porcelain panel or some day your order is receivved. r/s" thick. proved contact type, the 180 mounting V.T. socket, $0.60. Either of the $0.01%2c per square inch; 5/16" thick, .02e; B" thick, Radio Receiving Apparatus, Chemistry Laboratory, base Bated .04e, why pay batteries, air rifle. R. Wahlmann, 3257A Federal single, closed or double circuit jacks .03e; 7 /16" thick, .031/2c: 1/2" thick, amp. storage $0.85 and $1 will be given as These radio panels are made of the highest California, St. Louis, Mo. respectively at $0.70, more? high dielec- premiums with each Federal 226W amplifying transformer, grade black fibre. This material possesses V. 1714 and easy to $30; $7 or It. C. of A. U. V. 712, $7, and the U. tric strength, is inexpensive, unbreakable Sell New "Acme ", $45.. I K.W. transformer, amplifying transformer. Fada 5 ampere work. Our special offer, radio panels 6 x 6 a 1/2", 50e; "Mignon" RL C5, $20. Want Grebe CR5 or CR8. Wea- radio frequency a stock of rheostats, $1.35 or R. C. of A. U. R. 6 x 12 x 1/r $1. We also carry complete ver 1802 Spring Garden, Philadelphia. Nichrome power with ", for electrical msula- 542 porcelain V. T. socket supplied free of charge fibre rod and tribes, the real thing for C. W. or upon application. We pay each $8 U. V. 202 5 -watt power tube, tien special prices quoted For That New Set. Extra fine brass mesh. Ideal for We absolutely guarantee the Radio Instrument & Panel Co., Box 75, audios panel windows. Commercial appearance. Keeps radiophone transmission. equip- postage. foregoing apparatus. Only new and high grade Cicero, Illinois. out dust. Squares 2" x 2 ", 20e 3 for 50c. Jas. Unsatisfactory goods subject to Millen, Fife St., Forest Hills, N. Y. ment carried in stock. Postage premium return within Ave day's. Twelve hour service. Get Acquainted $. $. $.-Aside from our special by us, thereby saving time and the have an excellent proposition for own specifications, $1.50 per and insurance prepaid offers on this page purchases Log Sheets.-To your Remember us. The Kehler Radio Laboratories, you which will save you many dollars on your 100; $2:25 per 200. Write for sample sheet. Port money. We will be pleased to Dept. R, Abilene, Kansas. of well -known radio apparatus. set Ardor Radio Laboratory. Port Arthur. Tex. hear front you and if you desire a representative regenerative receiver, 10e which may be deducted from Perasco Tested 150 -2600 meter of bulletins enclose Dept. Radio Dealers. Send us your name and address. We detector control, $15. Botin $52. Unwired your first order. The Kehler Radio Laboratories, -$40. Perasco with detector control can interest you King Radio Mfg. Co., Century Bldg., Perasco 150 -475 meter regenerator R, Abilene, Kansas. Pittsburgh. Pa: $40. Grid and phone condensers 25c in same cabinet, PETIT The Kehler Radio each. All standard pars prices. Quality, Satisfaction, Service First. Supply Co., at standard Laboratories. C.W. Supersensitive reception with unusual hookup. Illinois. Horns, black, $4.50; nickeled, $5.25. Better than detector and one step ordinary amplifier. "Arkay" Radio 83 Order today for immediate shipment. Jennison, Send 50e, no stamps, for circuit and directions: Mont- Low Price, are predomirnent features Quality, Service, 1000 Russell Street, Waltham, Mass. gomery, 900 Seventh St.. Port Arthur, Texas, Radio Receiving Outfit. Consists of vario- of our Jupiter fixed condenser, Short Wave Regenerative Sets. Two variometers, meter tuning coil, 1000 ohm phones, large dials. Fully assembled. insulators, ground clamp, and instructions, coupler, Formica panel, Stop. -Here are some real bargains, DeForest 15 panel detector, wire, beginners or stu- they last, $25. Detector control panels, $4.50. only $12.75. Just the outfit for the While Kansas City, Mo. type receiving set, worth $140 for $65; Paragon RA Ten as sets at this price are limited. P. C. Hanger, 4130 Holmes St., worth $85 for $55; Three Grebe dents. Ruslt order North Radio short wave receiver, Maynard Ralston, Wireless, Electrical Dealer, Quality, Satisfaction, Service First. The Kehler CR3 receivers worth $65 for $45 each: Complete Univocal Baltimore, Olnio. Laboratories. wave receiving set, the best stoney can buy. has a short dial; socket, or honeycomb coil with wave regenerator, two step amplifier and honeycomb Baldwin Phones so sensitive? Free. -Rheostat, honeycomb Baldwin Phones. -Why are and every short wave set at $22. Write for description. coil mounting, with all accessories except because-(1) the small armature is pivoted Ave., Atlantic City, N. J. coils. Worth over $250 for $175. These are only a few Briefly connected to the dia- Haas, 2011 Atlantic designed t9 act as a fulcrum when through the king of our bargains. See page 893 if you want to save link. There is no tension or springing It cores in like a ton of bricks The Radio Exchange, 804 Helen St.. phragm by a small pieces See 885. money, join as in ordinary receivers. (2) Four pole "Amp- Li- T'one." page Sioux City, Ia. of metal sides of a lightly -Li- of a single solenoid act upon both It isn't a Loud Talker it it isn't a King "Amp (3) The force is concentrated at the See page 885. balanced armature. identically the same Tone." Radio Telephone Set. -2700 meters 1000 ohms re- center of a Twelve Hour Service. The Kehler Radio Laboratories. ceiver complete needy to set up. Guaranteed. Parcel all hi gin grVadepphophonograph s). as used $13; Lighter amplifier, $19.59; Det. 2 stage, Post paid. Allen & Hartman, 508 W. 122 nd St., New Type C $12; Improved Type E, Think of it. -2 stage re- TYpc G. $15. Single loud $24.50; 1 stage, $12; Det. i stage, $16. Description York City. Typo P, $14; Anti -Static Co., 350 Linden Type C without cord, $6. This is the same quest. Regenerative, $25. ABCO Radio speaker unit excellent for Navy Material.- Fessendin r,5 KW 500 cycle trunk re- as used in the Vocaloud and are Ave., N. Y. unit of $100. - Telefunken set, various own loudspeaker. With each pair buy unwisely. Send 25c for Blue- ceiver and transmitter, making your as premiums Beginners.-Don't parts, gasoline power units, motor generators. Henry phones purchased we will extend or give print of Wireless Receiving Set. Diagram -telling you to the RADIO NEWS or one "Dixie" Automatic Lock 3/16" Kienzle, 501 East 34th Street, New York, a one year's subscription These well - just what to buy -also the latest Federal Universal Plugs, $1.75. 25c coin or stamps. R. H. Dixon, 185 Milford of guaranteed and subject Sliders, Lot of Intcrnati anal Radio Co. variable condensers for known head sets are absolutely Ave., Newark, N. J. at prices less than five days if not satisfactory. Post'oid, panel mounting, with dial and knob to n etu'n within Radio discount on all standard apparatus. Post- .001 Mfd., $3.75; .002 and twelve hour service. The Kehler Special.-5% New wholesale .0005 Mfd., $3.50; insured, paid. AB'CO Radio, 350 Linden Ave., Brooklyn, 4 lbs. Variometers and va-io- Laboratories? Dept. R., Abilene, Kansas. Mfd., $4.25. \\'eight York. couplers for short wave sets, the $6 kind, complete Laboratories. 2 lbs. Vario- On Blueprints are Convenient. Our Twelve Hour Service. The Kehler Radio with dial and knob $3.75 each. Weight Radio Circuits enable you rotors 50e each Stators, 75c each. each on no separate blue print, phones, bulb, battery, tuner, meter or vadocoupler VT circuits, hock -ups. Set of Complete Sets.-(Audion) with bakelite base, 75e. Binding Pasts, to try out a largo rango of proven etc., $29. ARCO Radio, 350 Linden Ave., Brooklyn, V.T. sockets and combination transmitting, postage. yteStreet,k H. twelve, receiving or phone New York. N. Y. Bureau, 1929 . eQuin Brooklyn, 50e. Complete set of 24 for $1. The flan $8. Write for V. Butterw srrlln,331 Mo. V.T. Receiving Panel, just out, price McCausland Avenue, St. Louis, Co., Cheney, Kansas. circular. Cheney Radio Buy Direct From Manufacturers, mahogany cabinet con- and apparatus, 10% off with detector. $30 with one Wanted. -A few Western Electric VT -l's, VT -2's A mateurs. -Grebe or any standard taining short wave tuner be in good catalog, Cash or C. O. D. $45; two stage, $60 ; three stages (Use receivvers for use in our laboratory. Must order from any standard stage amplification, Radio State quantity aundaslowest B. M. Walker, Roseville, Ohio. loop), M. No jacks. Rear connections. Rogers operating condition. ttince. St., Pittsburgh. Pa. Reading Radio Shop, Box 6, Reading, Amateurs Attenti en. -$6 for variometers and vario- Company, 5133 Woodworth Regenerative sets, unwired, $;35. Parts of all - couplers. Range! You can eas- and Amplifier, V.T., 50 rents. Honey sale cheap. Why go downtown when we are Double Your CW and Radiafone Audion Detector rheostats, kinds for cheer- without adding another piece of apparatus coil mountings. 25 cents. Back mounted 4 blocks from Grand Central Station. Estimates ily do it comb your own knobs, Co., 214 East changing your set. The new "Master Cir- 40 cents. Composition for molding fully given. 2B.U.A. IL H. Electric or greatly ARRL pound. Send stamp for particulars. 2038. cuit" is the secret. Tested by many prominent etc. 35c 30th St. , Phone Vanderbilt of each station. Equipment Co., Duluth ian on stations it more than doubled range Palmers Electrical to cut out interference receive ; easily Try a Coil Aerial One five watt set puts twenty watts into antenna coil aerial and use its directive receiving Think of it! It's abso- $. $. $. complete set of 3 Fed - an indoor maxi- sends 2000 miles; fortes 10001 Kehler V.T. Special -A properties to eliminate interference Knowing the out. Ideal for 200 meters. Guar- eral automatic filament control jacks amounting to $4.20 condenser you will use lutely the best circuit 3 to mum capacity of the variable increase your range regardless of will be given as a premium with order for tubes the curves and tables we have anteed to double or 2 amplifiers at across the coil terminals, $2 for complete confidential photo - consist of 1 A.P. detector, $5; and A.P. construct a coil of proper num- what it is now. Send high grade equipment carried compiled enables you to prints of this wonder circuit. Get it working for you- $6.50 each. Only new and ber of turns for any wavelength. Charts covering 0 to your friends by your stack. Unsatisfactory goods subject to return within meters, 50c. No stamps be the first in your towns- surprise in service with 3600 meters, 50e; 3600 to 24000 results. Order today-immediately) Master five days. Don't forget the twelve hour A. Davis Co., 2371 Champlain N.W., phcnominal prepaid by us. The Kehler accepted. C. Engineering Company, Omaha. the postage and insurance Washington, D. C. Radio Laboratories, Dept. R, Abilene, Hans.

www.americanradiohistory.com 9I0 Radio News for March, 1922-

(Continued from page 909) (Exchange continued) Exchange. Wireless Course in National Radio Institute, Omni - Wonderfully Perfected Amateur Agents wanted in every city and town graph, key, buzzer, phones, text books, cost $75. Sacri- to sell radio apparatus. A few stocking agencies still fice $25. Frank Philippi, 80 Thompson, New Bedford, open. Deifelco, 12 Meeting Street, Pawtucket, R I. Mass. M.O. takes 2000 M loose coupler and crystal detector, Sell. -Back isst..5 Electrical and Mechanical Magazines. RTS STANDARD 16 $4; bracket banjo -mandolin, $10. All good. Oakley Write for description. Violin correspondence course with Gordon, Rays Crossing, Indiana. instrument, $10; gas bicycle lamp, $2.50. Donald Zook,. Memorize Continental Codo in one hour: Qualify Denver, Indiana. quickly Detector Panel for amateur license. See our ad on page 894, Quitting the Game-Detector and two step, $35. Long this issue. C. K. Dodge. and short wave regenerative receiver 150 -1000 meter,, $50. Compare it and you will buy the King "Amp -Li- Tone." Doolittle loud speaker, $15. Brandes navy type phone See page S85. $10. All in cabinets. E. Carter, 156 E. 85th St.. N. Y. C. The Price is Right and is based on quantity production, its up to you "Sparks ". Send in that "Twelve." Are you a Member of the -Radio Exchange? Quick delivery. King Amp -Li- Tone." See page 885. Sell, -23 caliber H.R. target revolver, $6.75; B. fiat tti Short Wave Var;ometer Receiver, $15, Audi+,n cabinet, Brass cornet, $7; No. 6 erector, $7. John Baenteli, - $3. Will sacrifice entire equipment including standard Sterling. Neb. -, made and experimental apparatus. Geo. Diem, 2304 Stop, Look, Act. Pathfinder motorbike, N. 15th St., including tires- Phila., Pa. and other accessories. All in excellent cordfion, $28 or Rare G,W. Sacrifice -First money order $90 gets four trade for two step amplifier and loud talker. Specify- tasted A -1 Western Electric 50 watt tubes used about make of instruments. Herbert Lee, Egan, Eo. Dols. two hours Sell separately, $25. No trades .considered Wanted- Omnigraph. Continental code 5 dial style. J. M. Cone, Box 53, Rockdale, Texas. Dewey Reifsteck, Calumet, Iowa Bargain. -Ranger motorbike, Nearly new, $35. Write Selling Out. -"Duck's" variometer set mounted on Roscoe Hanna, 310 Hay, Wilkinsburg, Pa. panel, $20; detector, 1 step on bakelite panel with jacks, Here's Your Opportunity -Must sell, 2 standard 50 plugs, etc, $18; 13 plate condenser, $1 ; E. Relay de- watt sockets, $2 each; .0015 mfds, Vernier Deforest tector tube (never used), $4. Everything guaranteed. " condenser, $12; .001 mfds. Vernier DeForest condenser, Rodney Roach, 41 Janvrin Ave , Bronxv'lle, N. Y. Front of Panel $10; _ .005 mfds. DeForest condenser, $5; all condensers Rotary.-Super-Benwood, $15. Never used. Thordar- are new original in wrappings assembled ready for son 14 K.W., $10, William Ranft, 4102 Iiate Ave., panel; new panel DeForest adiustablo 3 coil mounting, Baltimore, Md. $8. W -E Anticapacity switch, $1.50; 3 W.E. plugs and Price jacks for $3.50. All letters answered. J. M. Cone, Special Radio Storage Batteri^s, Edison, Lead all' Box 53, Rockdale, Texas. sizes. Radio Battery Service Station, 44 Bryant St., Assembled Malden, 1. Ii.11I. Sell!- Paragon regenerative receiver, $30 2 Acme amplifying transformers, $4.50 each; 2500 meter Navy coupler, $15. 3 Murdock sockets, 80e each; 1 pair Mur- For Sale.- 200 -600 meter regenerative set and bulb de- dock 3,000 ohm fones, $4; 3 Paragon rheostats, $1.50 tector with binding posts for all connections, $20. Ar- each; 3 jacks, $1.75; 1 plug, 50e. All letters answered. lington receiving transformer, $10. Harold IT. Lawler, . $5095 Norman Gimmy, 13503 Emily St., East Cleveland, Ohio. Rushville, Illinois. Bargain. -$95 takes triple coil tuner and audion con- Without trol (both mounted on shielded bakelite For Sale, -Radio apparatus Navy coupler, $16. Wm. and in cabinets), Mathemeier, Webster, S. D. Tube by Baldwin Rifles, Firco plug, coils, B battery, and tube. Insured All instruments new and ire excellent condition. Value $125. Write John Keene, Mont Clare, Pa. For Sale. -1 K.W. spark set nearly new, write for - Parcel Post particulars. Uriah Morris, 128 South Prince, Princeton, Short Wave and Detector, $35. Complete Crystal, $18. Indiana Prepaid Bargains. Joseph Quilter, 10 St. John Ave., Bingham- ton, N. Y. Stop. -Amrad type detector and one stage amplifier, Back of Panel MENT Portable Crystal Receiving Set, complete with phone respectively, $10, $15. DeForest oak coil mounting, $8. and aerial equipment, $15. Prepaid. Anthoxy Mogush. Thirteen coils 150 -20,000 meters, $15. Willard 60-80 - Install this efficient R. T. S. Panel and 859 Grant ER., Braddock, Pa. ampere 6 volt battery, $15. Complete 1" Mesco field Variable Grid Leak, 35c; grid 40e; sending set, $12. All excellent condition. Gross, Post. possess a correctly designed detector condensers, auction Road, White Plains, New York. capable of producing signal strength un- panels, $7; binding posts, 10e. Hudson Radio Supply, 262 Palisade Ave., Jersey City. equalled by any other tested in our lab- Sell, Trade.-Phones, loose couplers, etc. List mailed. Call Changed, my call has been changed from 8 A.C. oratory. It is guaranteed. Send yours. Want bulb. Hugh Lassie, Gardner's Lane, . to 8 B.T.O. C.W. on 230 meters. A. L. Kent, 87 Ansonia, Conn. AERIAL WIRE Chenango St., Binghamton, N. Y. A new shipment of pure Lake Superior Bargain.- Murdock 43 plate condenser, $3; Ducks 3500 Dirt Cheap. -Selling out my wireless. Fend for list, Solid Copper No. 14 Aerial wire, just re- loose coupler, $5.50. D. C. Kurtz, Mechanicsburg, Pa. Henry Lehmberg, 3832 N. Percy St Philadelphia. ceived. An exceptional- Marconi Receiver and auction control, $15. Fred Keut- 6 0 c mann, 434 East 89th St., N. Y. C. For Sale. -1 K.W, Thordarson transformer, Typ^ RS,. ly good buy at per 100 ft. $20; C: & W. rotary gap, $10. Both excellent condition. For Sale. -National Radio Institute Correspondence R. W. Fullerton, Beaver Dam, Wisc. NEW CATALOG course. Perfect condition, $40. Clifford Bey, Oregon, Ill. Send today for our new and enlarged For Sale. -§'.r K.W. transmitting set. Used 2 months, For Sale. dial omnigraph, $20. catalog. -25 Alfred. Cook, 148 good as new. Complete except condenser, $40. Defoe - Walnut St., Holyoke, Mass. Ginnings, Macomb, Illinois. For Sale.- 20,000 meter navy type coupler. $12; one inch "Bull Dog" spark coil, $2.50. S -BHT, 711 Wheeler Exchange-Radio Apparatus Co. undamped set, Type RADIO TESTING STATION Ave., Scranton, Pa. 93. Sell $52. Russell Huekstep, Lebanon, Indiana. Dept. For Sale. -Clapp- E'astham 14 K.W. rotary spark -gap, 5, 25 Sturgis St. condensers for sanie, key and antenna switch, $25. W. Wanted.- Omnigraph A -1 condition with head phones. C. Southard, 15 Park Ave., Baldwin, L. I. Continental dials only must be cheap. R. H. Jones, BINGHAMTON, NEW YORK. Box 443, Petersburg, Virginia. Cleveland Light - Weight Motorcycle for Radio receiving apparatus. Richard White, 909 Daniels St., Cedar 600- 20,000 meter receiver including radiotron, $35. Rapids, Iowa. Box 205, Williamsport, Pa. Trade. -E. x bound volumes I. C. S. Steam and Elec- trical Engineering course complete with questions and Mellophone, 5.0; motorcycle, $25; field glasses, $6;: answers. .1 G.E. split phase, 1/10 H.P. induction Mandolin, $3.50. Bbx 221, Waukomis, Oklahoma. RADIO motor, reversible, 1500 R.P.M. Want audion receiver. Send your proposition. la A. Young, 15 Liberty St., For Sale-Station 9 DEN includes acme 1 KW., Pontiac, Mich. 2 step amplifier. Roy Conibear, Amboy, Ill. For Sale. -2 Navy receivers type S.E 95a, 1500- 10,000 meters, $150 each. N. Abrams, 510 Claremont Bargain.-R41 receiver. Good as nevi, $20. Benj. PANELS Parkway, Bronx, N. Y. C. Click, Tangier, Ind. Sell.- Clapp- Eastham regenerative, $25. Half K.W. Selling Out. -aÌ4 K.W. Thordarson transformer, $15;. SAVE MONEY Thordarson Transformer, never used, $20. Osman Enclosed rotary gap with glass front and Emerson motor, Starner, Effingham, Ill. $13; plate glass condenser in can with oil (14 plates) on our special 30 -day offer. Our panels are mode $3; of genuine Exchange.-American Technical Society's "Telephony $10; heavy O.T., pair chirad variometer (new). $8;' and Telegraphy." Cost $19.80 for wireless receiving set, Brandes phones, $4.50. Coupler. bulbs, dials, aerial Norman Steams, 857 Fulton St., Brooklyn, N. Y. sockets, jacks, condensers and rheostats Write N. A. BAKELITE Sacrifice.-Slightly used radio apparatus in perfect Evans, 1133 Hodiamont Ave., St. Louis. Mo. DILECTO condition. Write for list. 85m. Emallerlberger, 15 XX Grade Black (Polished Surface) William St., Meadville, Pa. For Sale. -Choke coils for Rad'ophones, $1.75 each; two m.f. condensers. $1.50. T. Sabini. 415 East 148th used for the past 5 years as a stancard WIRELESS For Trade-One nearly new Remington automatic shot St.. N. Y. C. insulation by U. S. Navy. Universally recognized gun, best condition, for para ^on 10 or Grebe receiver by radio engineers as the most efficient insulation or small radio phone. What have you. J. D. Rathman; for For Salo -14 honeycomb coils $25; 2 Murdock .001 radio sets. Egan, S. D. variables $3.50 each; DeForest ULC -400 $3; National \Ve are specialists dialing exclusively in radio panels Bargain.-Regenerative set. Detector and two step Radio Natrometer less phone $25; one -inch spark coil, and have ready for immediate delivery the following with tubes A and B batteries. Seymour, 417 E 80th $4; one repaired tube with socket, $3; Jove detector, $1; sizes -3/16 inches thickness: St., New York City. DeForest CV -500 condenser, $4. Or all of above for $60. 335, Price Price Bargain. -Grebe 2 step, $25. Also Grebe coupler. J. P. Burton, Box Ashland, Virginia. 6 x 9 $1,15 6 x 19 $2.40 C. Schrader, Rockland Ave., Yonkers, N. Y. 6 x 12 1.50 12 x 18 4.55 Bargain.- Complete 600 meter receiving set, Ray Tricks, Puzzles and Games. 8 x 12 2.00 6 x 21 2.65 Pfankuck, Menominee, Stich. 6 x 18 2.25 12 x 14 3.50 For Sale. - DeForest RS 200 cabinet style double Lightning Cartoonists Book, secrets, tricks, $1. Christ- 9 x 12 2.25 honeycomb receiver with detector panel combined. cost man, 2925 Euclid, Kansas City, Mo. $45. Will sell for $32 or exchange for detector and We will cut special sizes to "Al ladin Bulletins" Free. Novelties, new magic. your 2 step. Richard Prowell, Tuscaloosa, Ala. specifications at 2.1/ cents square inch Thomas, Dept. 16, Box 86, French Lick, Indiana. For Sale. -1 Federal receiving transformer, $15. 1 sissisisscosissicssmssiscosisysicssassioscissisicsoicssicississississiossesisse Omnigraph with 4 dials, $10. Both in perfect condi- RADIO PANEL SPECIALTY CO tion. Jas. Potts, Rawlins, Wyo. Wanted to Buy Sales Office: 50 Church St., Room 1869 New York Ciity For Sale-Complete DeForest, Type 0,20 watt radiophone. Excellent condition. cost $290, sell for $190. Mail Old Gold, unused postage, war and thrift stamps, Enclosed find for Guaranteed satisfaction. Have worked 300 miles, with Liberty Bonds, silver, platinum, diamonds, jewelry, poor antenna. Send dime for photo and details. Im- watches, false teeth. magneto points, etc., new or Bakelite Panels size mediately. All letters answered. D. F. MacKenzie, 3801 broken. Cash immediately. Held ten days, returned it Ingomar, Washington, D. C. unsatisfactory. Ohio Smelting Co., 207 Lennox Bldg.,, Name Cleveland, Ohio. For Sale.- Meteor loose coupler, crystal detector, new eaunnmmaanaaauun111111un11111o111111111111111111111111111.1111 M11 .111mw1w.11m1111w11111111111111111n variometer set, '/a K.W. transformer and condenser, all Address for $40. T. S. Nichols, 500 South 5th St., Moberly. Mo. For Advertisers. City or Town State For Sale.-Crystal detector receiving set. Cost $40. Will sell for $23. Address Garrett S. Parsons, Romney, Biggest Pullers on Earth. .Jacobus Letters, $3.59. W. Va. Jacobus Advertising Service, Irvington, N, J.

www.americanradiohistory.com Radio News for March, 1922 91I

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