CIRCULATION \ 25 Cents March u. 1 9 22 Over 125 Illustrations \\ \\-\k; , Edited by H.GERNSBACK RAI)! 0 DILVIt+.!EN pi; LOH81341. cri()P4 ior+ !e9X4 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 amplifica- tion 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 de- signed for panel work and are of standardized construction so as to be interchangeable with other standard makes. A particularly desirable and exclusive fea- ture 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 adjust- ment, 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.