======~~

"The sOlll of music slumbers in the shell Till waked and kindled by the master's spell." (Samuel Rogers-UHu man Life"),

ITHIN your set slumbers a world of music which you W can charm to a living fullness and richness of tone by installing Thordarson Amplification. The manufacturers of leading quality receivers have recognized in Thordarson Amplifying Transformers a fidelity of musical re­ production which removes the ordinary artificial tones of radio and replaces them with living harmonies. Whether you are buying a complete receiver, or whether you are building your own - if you enjoy music - be sure that your trans­ formers are Thordarsons. TtIORDARSON RADIO TRANSFORMERS Supreme in Musical Performance!

THORDARSON ELECTRIC MANUfACTURING CO. 7Tansrormer Specialists Since 1895 WORWS OLD£ST AND LARGEST EXCLUSIVE TRANSFORMER MAKfRS ~uyon and KingsbuYI/ Streets - Chicaqo./ll.llSA.

~======RADIO AGEjor March, 1927 ~ ''MEN! Here's the 'dope 'you've been lOoking {oJ! How TO GET INTO THE RADIO

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Please Mention Radio Age 'W hen Writing to Adve'disers. ( FEB 26 1927 ©C1B 7H227 L-L- 2 RADIO AGE for March, 1927

Current Science Chats With ( the Editor

LIMAXING their work on super­ C heterodynes our staff is present­ ing in this issue's blueprint sec­ Established March, 1922 tion the Ideal Model of the Worlds / Record super which has been built for operation in connection with power Volume 6 \I March,1927 / Number J supply and filament battery elimina­ tion. Quality has been stressed, at the same time preserving the distance getting features of this receiver. For CONTENTS those who have followed this series FOR MARCH ISSUE the present article should be of more than ordinary interest. Cover design by A. P. Mehlum SciEntific articles and notes on ev­ eryday mechanics are attracting the Editorials ...... 4 attention of our readers and quite a A Loop and Four Tubes...... 5 few letters of commendation have By Armstrong Perry been received by the editors. We are Building the Hammarlund-Roberts ...... 7 always glad to 'know the desires of our readers and to fill these require­ By Leslie G. Biles ments to the best of our ability. The Froth Estate ...... 10 By Joseph Balsamo Armstrong Perry has been taking the novice by the hand, helping him Static and Statistics...... 16 along the rocky road of radio to a By Dorothy B. Stafford point where a .four-tube set used with Current Science ...... 19 a loop is described. What Mr. Perry has in mind for his next article we March Evening Skies ...... 21 cannot imagine, but we know it will Everyday Mechanics ...... 23 be good and our newly-made radio fans will devour it with interest and Ideal Model Worlds Record Super...... 25 approbation. By F. A. Hill What is known as the pioneer broad­ Pickups and Hookups by Our Readers ...... 33 casting station in the world is being described by Dorothy Brister Stafford Ridding Supers of Repeat Points...... 44 who has been a regular contributor to Corrected Broadcast LisL ...... 46-48-50-52-54 this magazine. Her sp'rightly com­ ments on broadcast stations have been Log-a-wave Chart...... 56 relished as much by our readers as by our editors. Classified Advertisements ...... ___ ._ ...... __ ... Third Cover Those who have been engaged in building the well-known Hammarlund­ Roberts receiver will find the second Radio Age is published monthly by RADIO AGE Inc. installment of the article by Mr. Biles Member: Audit Bureau of Circulation •. quite complete in details. The various Publication Office, Mount Morris, III. 404 North Wesley Ave., diagrams were printed in the first ar­ Address all communications to RADIO AGE, Inc. ticle which appeared in the February Executive, Editorial and Advertising Offices issue. 500 N. Dearborn Street, Chicago, Ill. Quite often we receive a letter from FREDERICK A. SMITH, Editor a fan who is not able to purchase a F. A. HILL, Associate Editor high-priced eliminator and who wishes M. B. SM1TH, Business Manager to make as much of the required ma­ Advertising Manager terial personally instead of buying it HARRY A. ACKERBURG readymade. In our next issue William 600 N. DearbQT1l St•• Chicauo. Ill. H. Fine tells how to make a simple and Eastern Representative inexpensive B eliminator, which will HEVEY & DURKEE, 15 West 44th St., New York, N. Y. deliver sufficient voltage and current for almost any ordinary receiver, pro­ Pacific Coast Representative viding it is constructed in accordance CONGER & MOODY, Sharon Bldg., San Francisco, Calif. with the instructions given. CONGER & MOODY, Higgins Bldg., Los Angeles, Calif. Final Advertising forms close on the 20th of the 2nd month preceding date of issue Vol. 6. No. 3. Issued monthly. Subscription price $2.50 a. year. March. 1927. Entered as second-elaBli matter at post office at Mount Morris. Illinois, under th. Act ot March 3, U79. Copyright, 1927, by RADIO AGE, Inc. Editor of RADIO AGE. RADIO AGE for March, 1927 3 \ ~EW!

The Layerbilt pat­ ented construction revealed . Each laycr is an electrical cell. making autom ati, '\. contact with it.r neighbors, und /ill- ing all av ailable space inside tke hat. tery case.

~ \ [)IFFERE~T! "

For greatest economy all loud speaker sets require the new Eveready~rbiltuB"Batteries

IT WILL pay you, in convenience Every loud-speaker set should battery is an outstanding battery­ and reliability as well as in dollars use Heavy-Duty batteries, for building achievement. It is the and cents saved, to use this re­ they alone offer economy on mod­ result of many years' experience markable battery. ern receivers. \Vhen you buy new plus the facilitie s and resources The reason for the Eveready "B" batteries, be sure to get the of the pioneer manufacturers of Layerbilt's surprising perform­ Heavy-Duty si ze, and remember all dry cell batteries.

ance lies in its exclusive, patented that the Eveready Layerbilt has NATIONAL CARBON CO., I NC. construction. No other battery proved to be the longest lasting, N ew York San Francisco is like it. It is built in flat layers most economical of all Heavy­ Unit 0/ Vnjo, ~ Carbide and Carbrm Corporation of current-producing elements, Duty batteries. making practically a solid block; Our laboratories are continu­ Tuesday "night is Eveready Hour N ight The layers make connection with ally testing batteries, and in all -9 P. M., Eastern Standard Time, through each ~ther automatically, and our tests we have yet to lind a the follow ing stations : WEAF-Nw York WTAll-Cleveland occupy all available space inside battery that is equal to the new WJAR-Providence wWJ-Detroit WE Er-Boston WGN-Chico.go the battery case. Layer-building improved and radically different WT AG-TVorcesler WQc-Do.venport pa~ks more active materials in a Eveready Layerbilt "B" Battery ~~~-!,;:;(J~~{Phio. wcco{:{~";::falis given area, and makes those mate­ No. 486. The development and WC AR- Pittsburglt KSD-St. Louis WSAI-Ci"cilt ll o. ti wRc-II'ashingt01I rials produce more electricity. perfecting of this remarkable wG¥-Scl:tll ectady 4 RADIO AGE for March, 1927

T IS with a good deal of pleasure that RADIO AGE munities outside of New York. It is a national, not a I adds several pages of fiction to the radio, current localized, condition. science and everyday mechanics which make this The serial story "The Froth Estate" is going to ex­ month's portion for our readers. We are sure that those plain why editors print smut. The story is to have a who start reading this first installment of "The Froth Es­ back ground of humor and drama and we are confident tate" will not miss any of the succeeding chapters. In it will entertain while it is carrying a big' message to arranging for the publication of this novel the editors readers who perhaps will welcome the facts in this form, have selected a story that deals with the drama that written by a man who knows the business of news-gath­ exists within the inner offices of great newspapers. It ering and news printing. is not so much a narrative of the adventures of the star * • * reporter and the sob-sister-those topics have been re­ ,\S THE March issue of this magazine goes to press ceiving liberal attention for years-but it is a stirring ft definite action is reported from Washington as to story about newspaper publishers, department managers legislation controlling broadcasting stations. Sometimes and editors. we think the radio industry, in giving its attention to How is it that we know so little about the daily lives this 1110st important matter of regulating the number of of the men and women behind our great journals? They stations, their wave-lengths and their intervals of silence, deliver the gossip of the world at our doors each day but the industry is overlooking a matter that is just as nobody has turned the tables and written humanly, un­ vital as the Washington situation. Those manufacturers derstandingly and sympathetically about the big folks and merchandisers of radio equipment who' devoutly of "The Fourth Estate," which Col. Minimil so quaintly wish for a further stabilization of the business and a mispronounces. greater prosperity for it, for twelve months in the year instead of six months, may do well to remember that the W hat happens when a new daily attempts to place its best way to sell radio merchandise is to create an in­ newspapers on the corner stands in a great city ? The creasing demand for it. The best way to create that next installment of "The Froth Estate" will tell about demand and maintain it is to make the broadcast pro­ a tremendous circulation war. The army of Bill Ros­ grams so good that no family will want to miss what som, publisher o f a "confession and diary daily, JJ is their neighbors are enthusiastically talking about. The going to shoot it out with the invaders under young best way to sell a radio set to a person who has been Daly Minimil, who believes that freedom of the press holding off is to convince him that in not owning a re­ shoul d include the privilege of circulating the news- ceiver he is absolutely robbing himself of delightful papers which the press runs off . . entertainment by our Josef Hoffmans, Schumann­ Mr. Joseph Balsamo, author of the story, is sketching Heincks. John McCormacks and our Kubeliks. He no portraits of publishers or editors in hi s story. In should be convinced because he is depriving himself of order to avoid any suspicion of such bad taste he has just those delights. created his own characters and his own community and It would not be a bad idea to make an improvement started them off on the way of adventure. Mr. Bal­ in the range and volume of summer entertainment. If samo knows hi s vegetables and in opening the doors there is a continuOlls line of excellent music on the air of the editorial sanctum to give his readers a peep at throughout the summer the radio business will begin to hidden mysteries we feel confident he will reveal in­ lose its seasonal aspect. At least it will not suffer from cidents and events that will mingle romance and humor malnutrition for four months out of twelve. In the with sufficient brush-strokes of melodrama to compel theater the play's the thing. In radio the program's the enthusiastic interest to the very end of the tale. thing. And that means the broadcast program, not the W hat reason for including a newspaper novel in a Washington legis lati ve program. radi o magazine, it may be asked. ' IV ell, the Fortunatus * * * * Gazette is building a powerful broadcasting station. o CIRCUIT ever published in RADIO AGE has re­ That's one reason. Another is that a good story needs N ceived the enthusiastic approval of its readers that no excuse for itself anywhere and gets a welcome has marked the World's Record Super-Eight. Hun­ everywhere. dreds of back numbers, principally the November, 1926, * * and the January, 1927, issues, have been delivered N ANNOUNCING that it would welcome censor­ through the mail to those who missed those numbers and I ship of newspapers to eliminate the smut that fills a the demand still is insistent. It will please the RADIO good many dail y newspapers these days the New York AGE followers to learn that development of this circuit Daily News says editorially : will appear in future issues so that several variations "We hate bureauocracy. We hate the suppression of of the general scheme of the hook-up may be studied. free speech. But unless the minds of the children of For those who are willing to invest in the higher-priced New York are to be drenched in obscenity, it seems to equipment the circuit published in this issue ",ill no doubt us that a censorship of the press as well as of the theater, prove immensely interesting. These various circuits are must come." wired and tested in our own laboratory before publica­ The same peril menaces many other American com- tion. RADIO AGE for March, 1927 5

Current Science

B I Evergday Mechanics

M. B. Smith A Monthly Publication Frederick A . Smith Bu.ineu Manager DetJOted to Practical Editor Radio A Loop and Four Tubes By ARMSTRONG PERRY

HERE is a time in life will bring in audible signals any­ covered often enough to make T when erecting an aerial is where if the receiver has enough ether-fishing an interesting sport. a joyous adventure, hut stages of amplification. that is hefore the waist line There is not much use of try­ Easy to Build catches up with the chest meas­ ing to use a small loop with less ONSTRUCTION of the loop urement. As the years slip away, than four tubes, three of which C can be made easy or difficult. such stunts as climbing trees and are radio-frequency amplifiers, There are two main differences balancing on ridgepoles cause nor is it safe to count on bring- between the loop and the straight thrills of another frequency. By aerial: the shape, and the fact that time the cost of extra tubes that both ends of the loop are at­ and fixin's is not so large a pro­ tached to the receiver instead of portion of the monthly income, one end as in the case of the so the indoor loop, with amplifi­ straight aerial. cation enough to make it effec­ A simple' loop can be made by tive, begins to make a strong ap­ running a wire around the room peal to the set builder. on the picture molding. Such a A loop three feet in diameter, wire may be used either as a loop, more or less, picks up a small with one end attached to the an­ amount of energy as compared tenna post of the receiver and the with a straight aerial fifty to one other to the post marked hundred feet long, even when "Ground," or as a straight aerial they are operated at the same with one end attached to the an­ height from the ground. The tenna post and the other end free. energy picked up decreases as the Another method is to construct square of the distance of the the loop on a closet door. The aerial above the earth, so the loop A good example of the small loop aeri al. large outside turn may be fas­ loses plenty by the time it is down This is one of many installed by the tened first, or the builder may Lo Lhe ground floor. According Huth-Funke n Telephone C o mpany work from the inside oul. In of Berlin in the offices of custom­ to the formula, it ought to pick ers who wanted to receive th e either case, t he ends should be up less than nothing in a base­ stock market reports by radio made fast to binding posts lo­ ment, but Dr. Rogers, a famous cated where they will not be inventor, was able to secure good ing in Honolulu at Met uchen, knocked loose by the heads, ar ms, results from underground loops. New Jersey, even with twice that knees or feet of those who hang He found static much less trou­ number of tubes. High-power wearing apparel in the closet or blesome when his aerial was be­ transoceanic code stations can be store in it the makin's of a wet low the surface of the earth. Some brought in with a good-sized day. The damage to the anatomy scientists account for this by spool of wire for an aerial, but will be repaired quickly by Na­ saying that two groups of waves speech and music do not carry as t ure, of course, but she will not are radiated from a transmitter, far as dots and dashes. With a do a thing f or screw holes that one group through the earth and good loop and four tubes, a hun­ have been splintered. They look the other through the ether above dred miles is a good aver age, awf ul, even when puttied up or the ground. Anyhow, a loop though a thousand miles may be filled with plast ic wood. F rom 6 RADIO AGE for March, 1927 mer, are connected to the slider, or other variable contact, in the middle of the potentiometer, and also to that end of the loop which does not lead to the grid of the first tube. The secondary of the third transformer goes to a combina­ tion grid leak and condenser, which is installed between the secondary and the grid of the de­ This is the schematic circuit of the loop set described by Mr. Perry for the tector tube. The grid leak should beginners. Many experiments may be performed with this set be variable, providing from one­ which will lead to an increased interest in radio half to six or more megohms of resistance. The condenser is of .00025 microfarads capacity. The the loop the wires may lead to the can tune out the prize fight and other end of the secondary con­ set by any convenient route, but bring in the Sunday School les­ nects with that wire from the po­ the shorter it is the better. Long son merely by adjusting the tentiometer which, as stated wires are likely to pick up inter­ door on which the loop is con­ above, connects with all of the ference from light wires and structed when she goes to the filament rheostats. It is pos­ other sources. closet to get hubby's slippers. sible, of course, to use one rhe­ Portable loops can be made on Taking a diagram from a radio ostat for all the filaments, but it any available frame, such as an catalogue-and that is a safe is desirable to have at least two: antique reel used by ladies of a place to take it from if the dealer one for the' amplifier tubes and past generation for making has been in business for five the other for the detector tube. skeins of the yarn as it came years or more without being mur­ This completes the hook-up ex­ from the spinning wheel. The dered-we find that one end of cept for the phones, which are frame and the loop may be the loop connects directly with connected with the plate of the square, octagonal, oval or of any the grid of the first radio-fre­ detector tube and with one of the desired shape. The wires should quency amplifier tube. The other positive terminals of the "B" bat­ be evenly spaced and firmly held end leads to the middle point of a tery. This battery should de­ in place. The spacing makes a potentiometer, where there is a liver 45 volts, but the phone con­ difference, but it requires higher slider or some other variable nection should be shifted from mathematics to express it ade­ connection. Across the two ter­ one positive terminal to another quately. Anyone who. desires to minals of the loop is shunted a until the results of the different go into the matter exhaustively variable condenser of .0005 available voltages are deter­ can secure a pamphlet from the microfarads capacity. mined. Superintendent of Documents, One end of the potentiometer Government Printing Office, is connected to all four of the Aerial or Loop Washington, D. C. The reader filament rheostats, the secondary HIS receiver should work as will be exhausted before the sub­ coil of the third amplifying trans­ T well with a straight antenna ject is. A practical loop for this former, the negative terminal of 2.s with a loop, although the di­ set is one three feet square, with the "B" battery, and the positive rectional effect of the loop will ten turns of insulated wire spaced terminal of the "A" battery. be lost by the change. Radio­ one-half inch between turns. In­ This potentiometer is a necessary frequency receivers are likely to sulated wire should be used al­ part of most radio-frequency am­ be sensitive, and a short antenna ways in making loop aerials. plifier circuits. It steadies the may give better results than a Taps may be taken off at any action of the tubes and helps to long one. Anything from twen­ point if variability is desired. prevent howling. The other end ty-five feet up, or down, may be The loop has other advantages of it connects with the filament tried and experiments will lead besides its small size and its con­ terminals that are not connected to some interesting comparisons. venience. It has directional ef­ with the filament rheostats. A ground wire is connected to fects. The electro-magnetic field The plate of the first tube con­ one of the terminals left vacant that forms a part of the advanc­ nects with the primary coil of the by the removal of the loop. ing radio wave has a greater ef­ first radio-frequency transfor­ It is well to remember, when fect upon an aerial wire that is mer. The other end of the pri­ building a radio-frequency re­ at right angles to its plane that it mary connects with the primaries ceiver, that it is very sensitive has upon one whose plane is of the two other amplifying to interference of all kinds. En­ parallel to that of the field. There transformers and the connecting ergy may be transferred from are radio waves coming toward a wire goes on to the positive ter­ one coil to another although it receiver from all directions, and minal of the "B" battery. was farthest from the thoughts as the loop is turned on its axis The secondary of the first of the builder to permit any such 'me station fades out and another transformer, and also the sec­ interaction. The transformer If comes in. wifie is wise, she ondary of the second transfor- (Contil1ued 011 page 315) RA.OIO AGE for March, 1927 Building the Hammarlund­ Roberts (Part Two) By LESLIE G. BILES

T WILL he well for the the rotor set screws. Mount one hot enough to cause the solder to I builder to observe closely of the Auto-Couple coil cams on flow freely, no trouble should be the system employed in as­ the projecting shaft so that the experienced in making neat and sembling and wiring. Usually set screw in the cam is exactly permanent joints. it is the custom to assemble the on top (looking down on the set) In wiring all leads should be entire receiver and then do all when the plates of the condens­ run by the most direct route and the wiring. Here the assembly ers are all the way in. no attempt should be made to se­ is done jointly with the wiring. Before mounting the coils on cure square bends or other old This tends toward ease of build­ their condensers remove the long fashioned ideas in wiring. Care ing because the hand is not hin­ adj usting screws in the square should be taken to see that none dered by the obstruction of parts brass posts at the primary end of of the wires interfere with the not yet in place. The section the coils because they will be ex­ full motion of the condenser rotor method of building up the shield tremely difficult to remove when plates moving primary coils and makes it possible to wire easily the assembly is completed. their cams and flexible connect­ the parts which will later be com­ After removing these screws ors. pletely enclosed by the shield. mount the coils on the two con­ Now make the connections be­ The first step in the construc­ densers as shown, using the tween the first coil, antenna tion of the receiver is to attach brackets and screws packed with switch, condenser and first R-F the front panel to the baseboard the coils. socket as shown in Fig. 4 and and mount the panel instruments The cams on tuning condensers also in the picture diagram. as shown in the picture diagram. Now erect shield section :-<0. Now mount tuning condenser I-B screwing the lip of the shield No. I with its small shield. The to the shield strip, and fasten the single hole mounting nuts on this corner of the two shield sections and the other tuning condensers by means of one of the shield are not used and may be dis­ corner clamps. carded. Secure a soldering lug to the After removing the mounting hole in the center of the shield, nuts and the short shafts from the head of the screw and the lug the remaining two condensers, being on the outside. mount one of them, first placing Run a wire from this lug to shield section No. IA between the Test outfit used for locating opens upper end of soldering lug ter­ condenser and the panel. in coils or shorts in condensers minal R of condenser No. 1. Loosen the screws in the fric­ Now make the connections to tion brakes of all condensers. the second R F stage. As each Now slide the two aluminum No.2 and No.3 are not yet to be wire is put in place, check the strips of the foundation unit in mounted but the same mounting connection with the picture dia­ place, taking care to place them instructions given above will gram. in their correct positions. Then later apply to these two condens­ Connect terminal E of coil No. slide shield section IE on top of ers. 2 through the remaining hole in these strips and under the lip of The assembly is now ready for the shield to the unattached ter­ the panel shield section so that the first part of the wiring. minal of Equalizer No. 1. the holes in the lip of the panel · Use the special wire solder in It might be mentioned here shield, the bottom shield and the the foundation unit and a light that for convenience in wiring strips line up. iron which should first be cleaned some wires will be cut to desjg­ Socket No. 2 should then be and properly tinned. nated lengths and only attached screwed in place and socket No. Be extremely sparing with the at one end. When the other end I is fastened to the baseboard in amount of flux used and use just of the wire is later attached the line with socket No.2. enough solder to run in the joint wire should be cut to the exact N ow loosen the two set screws and make a firm connection. length required. in the rotor of the first tuning Large gobs of solder are entirely Solder a 6" length of wire to condenser, slide the shaft back unnecessary and only serve to one end of the resistance strip in so that %" proj ects beyond the make an otherwise good job look the foundation unit. Solder the rear bearing and then retighten unworkmanlike. If the iron is other end of the resistance strip 8 RADIO AGE for March, 1927 to a soldering lug secured in and run a wire from the lower receiver. The extension shaft place by the binding nut on ter­ end of soldering lug R terminal of the foundation unit and the minal plus of socket No.2. of condenser 3 to terminal minus two coil cams can now be put in Attach a 7" wire to terminal of socket No.3. place and adjusted as follows: B of coil No.2. Mount coil No. 3 to condenser Push the shaft through con­ Attach an 8" wire to terminal No.3. denser No.2 and then thread on P of socket No.2. Terminal F of coil No. 3 to ter­ one of the coil cams with the knob Attach a 7" piece of wire to the minal minus of socket No.3. of the cam toward the front unattached terminal of Equalizer The free end· of wire from panel. Continue the shaft No.2. Equalizer No.2 to terminal E of through condenser No. 3 until Shield section lD may now be coil No.3. %" of the shaft projects beyond erected, fastening it in the same The free end of wire from ter­ the rear bearing of the con­ manner as section lB was fas­ minal P of socket No. 2 to ter­ denser. Then turn the movable tened. minal P of coil No.3. plates of the two condensers un­ Pass the free end of the resist­ The upper end of soldering lug til a position is reached where ance strip wire through the terminal S of condenser No. 3 the set screws in the rotors of the shield hole and then attach it to to terminal G of coil No.3. condensers can be reached with terminal A of the rheostat (the Terminal G of coil No.3 to the a screw driver. Tighten one terminal next to the shield) . free end of the grid condenser. screw in each rotor slightly and Thread the free end of the wire Attach a 7" wire to terminal then by means of the shaft turn attached to terminal B socket No. plus of socket No.3. the plates entirely out of mesh 2 through the remaining hole in Attach a 4" wire tq terminal P and gently· force the rotor sec­ the shield. The free end will be of socket No.3. tions of the two condensers into connected later. line by pressing them up against Secure a soldering lug in the their respective stops. Then by center hole of shield section lD. Part One of this article by means of the shaft turn the ro­ Mr. Biles appeared in the Feb­ Attach the grid leak clips to ruary issue of RADIO AGE. In tors so that the set screws may the .00025 mid. fixed condenser building the set the present ar­ again be reached and all screws using the screws furnished with ticle refers back to the diagrams tightened securely, making sure and figures shown in the preced. the condenser. To one of the ter­ ing number. that the rotors of the condensers minals on the under part of the Those who are accustomed to have not shifted out of line. condenser, attach the grid con­ building receivers will be able to If the condenser shaft turns build from the February issue. denser connecting strip. The For those who cannot work from . very stiffly this can be remedied hole in the other end of the strip a schematic, this article gives by lining up the condensers prop­ slips over terminal G of socket the detailed procedure for build­ erly. One method of doing this ing the set. No.3. -Editor. is to loosen the screws holding Condenser No. 3 should now the shields to the shield strips be mounted. Place shield sec­ and turn the condenser shaft tions lC and 2A together so that Attach a 6" wire to terminal B back and forth several times, at the condenser mounting holes in of coil No.3. the same time moving back and the sections coincide. Then Shield section No. 2B can now forth the shield sections support­ mount the condenser against sec­ be erected. ing condenser No. 3 until a spot tion No. 2A using two ~x6 ! 32 Mount the midget condenser in is found where the condenser round head screws which pass the large hole in shield section turns most freely. Hold the through both shield sections and No. 2B in the position shown. shield firmly in this position and hold these sections together. The large spacing washer in the retighten all screws in the shield Erect this assembly, first placing foundation unit will be required mounting strips. shield section No. 2E under the in mounting the condenser to the The cams for coils No.2 and lip of shield section No. 2A, tak­ shield. No. 3 should then be adj usted to ing care that the two socket holes Terminal S of the midget con­ their proper positions. in this section coincide with the denser to terminal G of coil No.3. Shield section No. 2C may now socket fastening holes in the Shield section No. 2D should be erected and work started on shield strip. Fasten the lips of now be erected. the audio amplifier unit. the two shield sections to the Thread free end of wire from Mount the ten binding posts on shield strip and secure the cor­ terminal plus of socket No. 3 the side of the sub-panel having ners with corner pieces. through shield section lD. two countersunk holes. Between Thread the free end of wire Thread free end of wire from the A Batt plus binding post and from terminal P socket No. 2 terminal B of socket No. 3 the top of the panel place a sol­ through shield section 1 C and 2A through shield. dering lug. as shown in the diagram. Thread free end of wire from Next the three amperites are Thread the free end of wire terminal B of coil No.3 through mounted, first removing the from Equalizer No.2 through the shield, using hole near the front screws and nuts from the am­ same shield section as shown in of the shield. perite mounting strips and sub­ the diagram. This completes the wiring of stituting the six %x4!36 round Fasten socket No. 3 in place, the radio frequency end of the head screws provided in the RADIO AGE for March, 1927 9 foundation unit. These screws Free end of wire from "B" of movement of the voltmeter should be passed through the am­ coil No.3 to lug "B" on sub-panel. needle. If any movement should perite clip and the amperite base Free end of wire from termi­ occur the circuit on which it oc­ strip and secured under the sub­ nal B of coil No.2 to soldering curs should be traced and the er­ panel by a nut under which is lug B on sub-panel. ror corrected. placed a soldering lug. The soldering lug on shield After completing the above Sockets No.4 and 5 (without section No. 1D to the soldering tests replace the plus A wire on bases) are now to be mounted. lug on the minus terminal of the A Bat plus binding post and To mount them it is necessary to socket No.5. turn the volume control to the take them apart by removing the The soldering lug on the P ter­ "off" position. screw in the bottom part of the minal of socket No.5 to the P ter­ You are now ready to connect socket and pulling the two halves minal of the jack. the "B" and "C" batteries. First apart. The half with the springs Terminal B of jack to 135 V connect the "C" batteries and is pushed up through the large plus binding post. then the "B" batteries. hole in the sub-panel and then Soldering lug on A plus bind­ the top half replaced so that the ing post to terminal B of switch Final Adjustment pin in the top section fits in the (the outer terminal). FTER completing the connec­ slot in the bottom section. The Terminal C of switch (near A tions to all batteries the an­ screw holding the halves together front panel) to soldering lug A tenna should be attached to the should then be replaced. on sub-panel. middle post of the antenna switch A soldering lug should be and the ground wire should be placed under the heads of the P Checking Your Work connected directly to the minus terminal and the minus terminal ITH assembly and wiring terminal of the "A" battery. screws of socket No.5. W completed the builder will Now plug in the loud speaker and Next secure a soldering lug on do well to follow a systematic the receiver is ready to operate. the top side of the sub-panel di­ course of testing, for even the Turn the volume control in a rectly in front of amperite No. most careful workman sometimes clockwise direction as far as it 3. A soldering lug is also placed makes mistakes and a slight will go and slowly turn the two on the under side of the panel error in wiring may cause con­ tuning dials simultaneously, and held in place by the nut. siderable damage. The following keeping both at approximately Then similarly attach solder­ procedure is therefore recom­ the same settings. As soon as a ing lugs to the hole on the edge mended: station is heard, turn back the of the panel near socket No.4. Connect the plus terminal of volume control until the signal Now remove the screws from the A battery to the binding post becomes barely audible. Then the .001 mfd. fixed condenser and marked A Bat plus. Then touch adjust each tuning dial sep­ fasten it to the under side of the the wire from the minus side of arately for loudest signal and set sub-panel. Soldering lugs should the A battery to the metal part the volume control so that the then be attached to each terminal of the A Bat-binding post (the output from the loud speaker is of the condenser. tubes ·are not yet in the set). If quite soft. Now adjust the Mid­ The transformers are then a spark occurs it indicates an er­ get condenser (on the left side mounted with their terminals in ror in the filament wiring, entire of the detector stage shield) to the positions shown in the dia­ filament circuit should be checked the point where the signal is gram. until the mistake is found and loudest. Then carefully retune All of the wiring now to be corrected. the second tuning dial for loud­ done takes place on the under If no spark occurs make the est signal and then make a final side of the sub-panel. These con­ connection to the A Bat-binding adjustment of the midget. Once nections are clearly indicated on post and turn the combination set, this midget compensating the picture diagram by broken volume control-fjlament switch condenser should need no further lines. The connections repre­ in a counter-clockwise direction attention. sented by solid lines are not to as far as it will go. The switch We are now ready to adjust be made until after the audio am­ is now off. All five tubes should the equalizing condensers. First plifier unit has been mounted in be placed in their sockets but not tune in a loud signal at about 30 place. one should light. on the dials. Then disconnect When these connections have With the volume control full the wire running to the "minus" been made the audio unit which on and with all the tubes in their post of the first socket, leaving is ready to be mounted on the sockets, remove the wire from the the tube in the socket however. baseboard, and then the radio A Bat-binding post and connect Now, with a wooden stick sharp­ frequency and audio frequency it to the plus terminal of a volt­ ened like a screw driver, turn the ends of the receiver are to be meter. Connect one end of an­ screw· in the center of the first hooked up. other wire to the minus terminal equalizer until the signal is at a End of wire from P of socket of the voltmeter and touch the minimum or disappears entirely. No.3 to P of transformer No. l. other end of this wire to each of Now replace the wire on the post End of wire from "plus" of the two C Bat-posts and the 45 of the first socket. This com­ socket No.3 10 "B" of amperite V, 67 V, 90 V and 135 V posts. pletes the balancing of the first No. 1. In no case should there be any (Continued on page 32) 10 RADIO AGE for March, 1927

FROTIl

the Colonel c'arried full facial foliage as standard equipment. His dark beard was grizzled and coarse but it was well kept, for he long since had given over th~ habit of munching fine cut. He had not eschewed tobacco for any ethical reason. He simply found that in building up the Minimil fort;'nes he had had no time to expectorate and anyhow, in the touch and go of the game, it waS seldom safe to turn's one head away from the main source of pasteboard supplies. Col. Minimil was fifty-five years old, hale, hearty Colonel and strong in wind and limb. He was proud of his Maximilian Minimil six feet two of virile manhood and of the fact that he had not been indicted for fifteen years. His clothes, like his home and his fleet of high-powered closed cars and his office, insinuated prosperity just as the steam calliope suggests that a circus is in town. His HE city of Fortunatus for a decade had been a eyes were dark brm..vn, deep set under shaggJT brows T source of amazement for the rest of the country. and his masterful hands were calloused and gnarled Located in Coma, the latest state to add its . from long years of pushing away propositions that starry spangle to the permanently waved banner of promised less than forty per centum. the republic, the city had grown from nowhere into a His fathers came to the western world with Cortez big time metropolis before the elder inhabitants realized and he traced his genealogy directly back to a romantic it. The place awoke suddenly to the diverting dis­ marriage between a Spanish officer and an Aztec covery that it was a huge patchwork of wickedness princess. In his safety deposit vaults he treasured a and virtue, that it had a traffic problem, a state primary document, uttered less than half a century after the election ,scandal, a high birth rate, a prosecuting conquest of Me~ico, in which it was set out that one attorney who was a darb at politics and an equally Montezuma Minimil, grandson of a quartermaster contaminated water supply. sergeant on the staff of Cortez himself, had bequeathed One of the strangest facts about the growth of a pecan grove to the public library of Azlatzcan. This Fortunatus was that the city stood as a civic contra­ piece la ter began to exude crude oil and by an odd diction of the tradition that a great town necessarily freak of circumstance agents of the present Minimil must rise from the shore of the sea, straddle the current bough t the land, cutdown the pecan trees and turned of a mighty river or lave the municipal feet in the the library building into a refinery. Not being blessed limpid shallows of an expansive inland sea. For­ with a knowledge of his ancestral tongue Col. Minimil tunatus had none of these littoral advantages but it always spoke of this good stroke as the Ashcan Develop­ seemed certflin nevertheless, that yet a few years more ment. and it would be one of the half dozen greatest com­ "Son" said the Colonel, on the morning of October munities in the world. Situated between Maine and 16, 1925, "if you will tear yourself away from your California and sou th of the Canadian border the other arduous duties long enough to call at my office city was the heart of a network of hard roads and took at .3 o'clock this afternoon, you will learn something generous toll of the world's gaswdriven COmmerce. to your advantage." Col. Maximilian Minimil, the biggest man in For­ Daly Sayles Minimil knew his onions. He didn't tunatus, occupied the most extensive suite of offices plead another engagement nor was he so fooli~h as to in the tallest building in the city. Like so many other ask questions. Daly was like that because his father rugged trail-blazers who had started from scratch, was like that. RADIO AGE for March, 1927 11

ESTATE ..- ~--

At 3 o'clock the young man stepped out of an imported gas-hog at the renais­ sance entrance of the Minimil building. He wore a raccoon coat and no hat. In Ills right hand he carried a first edition of "The Constant Nymph." Turning to the military attache who occupied the driver's seat, Daly said simply: "Take Miss Sartorius to the Green Ink Club." Daly Sayles Minimil He smiled in response to the girl's good-bye salu te and hastened a way. The elder Minimillooked up from the coupons that that the people knock off any candidate his sheet lay in profusion on the glistening top of his mellow indorses." mahogany table-desk. It was a chilly day, but bright "So," men tioned Daly, "you t hink if I started a and clear and the sun waS filtering through the mul­ newspaper and supported all political candidates you lioned windows, laying a soft tint of old gold upon the opposed- figure of the Colonel. One window, slightly open, "Correct" said the Colonel. " The people are tired admitted a gentle zephyr which toyed with the dra­ of having an editor's selected list of candidates shoved peries of rose-colored French brocade, tossing them under their nose. Ne\vspaper publishers can give us inward and upward and at intervals permitting the the news but who gave ~ em the privilege of doing our insistent sunshine to enter so effulgently that even thinking for us?" the form of .[\'liss Sadie Long, the colonel's secretary, "The Gods of Olympus, maybe." Daly was tlllnking lost some of its similarity to a mailing tube. Miss fast and enj oying it. Long had been selected by the Colonel's wife. She fiSo' s your old man" said the Colonel, who always stood, then, in a sort of matinee aurora as she said made a leap for the curb ",hen conversation took a quietly to Colonel Minimil: literary turn. uMr. Daly Minimil is here to see you." U\Vhen do we .start?" inquired Daly. "Why in hell doesn't he come in then?" "Right now." "Very good, sir.H Miss Long had read so many Daly took off his raccoon coat. books of English fiction that she talked like a butler. "What's the appropriation?" he asked. IlListen, Dale, you've been talking for several years ttTen million dollars." about wanting to go in to the newspaper business. Daly sat down. Y ou're not worth a damn in my business. or any other II business, so far as I have discovered. You might succeed with a daily paper. Look at that slant-head ONCRETE foundations for the reception of Rossom. He made good. His paper has just licked C immense printing presses and the sinking of my candidate for the governorship. caissons had hardly begun when the people of For­ "Enfield licked" exclaimed Daly. "How'd Rossom tunatus acquired the habit of calling the enterprise do it?" "Minimil's Folly." The Colonel was not a bit dis­ "By supporting him." turbed by tills pleasant and human attitude of Ills til don't get it," said Daly. neie:hbors, enemies and friends. As marble walls went UNeither does Rossom. He hasn't found out yet up ..... and Corinthian colonades arose and joined the 12 RADIO AGE for March, 1927 . The Froth Estate classic facade the Colonel encouraged the builders furtively eyeing the Colonel, scenting an elemen tal foe. with feverish enthusiasm. Miss Long sat at her own desk of quarter-sawed solid Fortunatus drove past the imposing pile and raised mahogany and fell to wishing. that the jade green an eyebrow. The population already enjoyed three shade on the heavily elegant desk lamp were rose­ morning and six afternoon dailies. Leading citizens tinted to match the curtains. Green was so trying who might have possessed some sympathetic interest on a complexion naturally inclined toward sallow. in the birth pains of the new palladium were deaf to Daly called upon Franklin for a word as to how the Minimil ballyhoo. They felt they were under the editorial plans and policies were shaping up. coJd scrutiny of seven established newspaper owners. tlWe are almost ready'" said Franklin. "We have A bird on the editorial page is worth two in the blue arranged for wire news and' a world-wide cable service prints. has been contracted for. The editorial staff is almost "We're about as welcome as the plague in this here complete. We will be prepared for the first turn on - Froth Estate" chuckled the Colonel. "But while we the presses on July 1." are still in our corner we can be making our plans for "What are you going to do about those damned giving' em hell." crooks who are trying to steal the R. and N. power

liThe main thing is to give Jm a good newspaper franchise ?" when the time comes," laughed Daly. "You see it Colonel Minimil boomed the question at Franklin was Edmund' Burke's idea that the Fourth Estate as if he were to follow it up with a grip on the edito"'s involved big social responsibilities." throat. "Social Flapdoodle " scorned the Colonel. "A good HWhy" said Franklin, HI am not familiar with the newspaper is only another name for a sock full of situation but-" buckshot." "Pardon me, dad," interposed Daly as he saw his Daly sighed. He began to realize it was going to sire rise and prepare for action. "We will get to that be difficult to keep his male parent out of the hand in good time. What we want to do here today is to grenade bin. The old man said nothing furiher but get a line on general plans and policies, not details." Daly with misgiving, saw the Colonel's eyes smolder "All right, Dale" the ColOIiel replied, subsiding into and he knew the embers of past conflicts were only his chair, "but don't forget what I told you about that awaiting the opening of the editorial damper to burst sock." f in to new flame. Daly paid no heed. He turned to Shortrate and Late in June work had progressed to the point where asked him if the advertising departmen t had anything it seemed advisable to call a conference of all the heads to report. of departments. Daly had been acquiring an editorial "We have canvassed the field pretty thoroughly" and business staff and preliminary details were under said Shortrate, Hand have signed up some pretty fair way. Aside from Daly himself and, of course, the business. But lots of 'ern are going to wait to see what elder Minimil, the most important men in the per­ we do." sonnel of the Fortuna tus Gazette were Dana Greeley flThey want further evidence as to our editorial Franklin, editor; ElmerShortrate, advertising director, policy I suppose," said Daly. "It might be well to Zen us Babbitt, business manager, and A. B. C. Bur­ mention the fact here that our editorial policy will roughs, circulation director. That first conference not be touched by advertising influence, regardless was a solemn occasion, the forerunner of many others. of how sincerely we may hope that the advertisers The Gaiette was about to balance itself uncertainly will approve of us." for a breath-taking instant and then take the first "Quite naturally" said Shortrate. step as a going concern. The Colonel looked over at Burroughs and made a They assembled in Colonel Minimi!,s office but for sweep with his hand as if he were swishing a gnat once the Colonel was contented to seat himself without away from the end of his nose. the circle. He occupied a chair near a window where Shor!ra te leaned forward and picked up a sheaf of he could see and hear, but it was plain that Daly was memoranda. the executive in charge. Daly wished the chair which ·'Income from circulation, from the sale of the he drew up to the table might have been less like a paper on the newsstands and to mail and horne de­ throne in a Gloria Swanson movie. He observed that livery subscribers, will be of secondary importance Burroughs, the new circulation manager, was embar­ to the Gazette" he said. "Circulation, in these days rassed at having dropped a bit of cigarette ash on the of thick newspapers and the high cost of white paper $5,000 rug. Burroughs wore a gunman cap but he i. per .re a liability and not an asset. The more you knew his street corners. Mr. Shortrate was more at sell the more money you lose. "But" and here Mr. ease. He had been connected with a prosperous con­ Shortrate raised a trained conference forefinger, Hcir_ fession and diary daily and was accustomed to ele· eulation is necessary in order to obtain any adequate gance. Mr. Babbitt was tapping a front tooth with volume of advertising at productive rates." a pencil and mentally estimating what the money Shortra te here turned and looked fixedly at Franklin. spent for this regal office would bring if invested at the "And when I say circulation I mean the proper kind usual 6 per centum. Dana Greeley Franklin was of circulation. I want to stress that fact with the RADIO AGE for March, 1927 The Froth Estate 13 thought that to succeed we must have co-ordination "Now, mind you," continued Shortrate, "fully 90 of editorial1 advertising and circulation effort." per cent of the buying power of this country is repre­ "Would you specify?" asked Mr. Franklin. He sented in Groups III and IV. It is the buying power was wishing the director would not make speeches and that produces response to advertising. In order to stress things with the thought. get advertising, therefore, and in order to retain it H'Vith pleasure," assented Mr. Shortrate. IIThere you must have a newspaper that appeals particularly are five groups of people in OUf country. to Groups III and IV." "Group 1-2 per cent. Morons in asylums and Franklin shrunk in his chair. "Good Lord," he said. public insti­ "Let's cut tutions. ou t the edi­ "Group II torial page." -18percen't. Daly turn­ They h a v e ed to Bur­ the in telli­ r ou g h s . gence of a 9- "\Vha t's your year old reaction?" he child. Their asked, and Incomes are Franklin from $500 to squirmed $1,000 a year, again. even though "My idea they are exactly /' ex­ adults. claimed Bur­

"Group III roughs. /I Jazz -60 per cen t. it up. Flocks They have of comics. the intelli­ Two or three gence of a sex serials child of thir­ running in teen wi th in­ every issue. comes of Shortra to' s $1,000 to figures look $3,000 a tough for the year." so-called hu­ LIt thiJ man race but point fiiiJJ we got to play Long walkJ the cards as undeadily to they l ay. llze waler coo!­ Snap it up, erand takua that'smy drink. personal "Group IV idea." -16percent. "Wh&t's the appro- ulf g i r I s They have J::ri:.tion?" D aly asked wore Ion g IS-year old "Ten mil:iondollars." skirts Ros- Dcly sat down. intelligence sam's paper and their in­ would ha-/e comes range been out of from $5,000 to $25,000." business long ago," seconded the Colonel. fUr. Babbitt wipa hiJ brow between Group IV and uGive 'em some of the highbrow stuff of course," Group V, although the room iJ no! warm. suggested Shortrate, "but for every page of straight (lGroup V-4 per cent. Their incomes are from news give' em two pages of jazz. $25,000 up. They form the genius group. Educators, Franklin looked appealingly at D aLY and a message lawyers, preachers and scientists are included in this of mutual understanding passed between them. The group." editor was wondering why a wise providence permitted Col. Minimil looked over at Burroughs and laid the invention of advertising departments. the upper lid of his right eye completely over his right Daly reflected there were kinks in the newspaper eyeball and left it there for some time. profession that he, as a layman, had not suspected. "Cheerful guy," whispered the Colonel. But there was a pretty good brain under the slicked R..-\DIO AGE for March, 1927 The Froth Estate

back hair of the younger l\{inimil and he was by no and w ritten for a magazine on the order of l\lencken's. means such a coot as his pants made him appear. When Col. Minimil gaye a $10,000,000 impetus to "I would dislike very much," he said~ (Ito undertake Daly's's ambition to be a newspaper publisher she the op eration of a newspaper which was to be edited thought it extrayagant although even her house dresses down to a group fa ther than up to a group. I realize were original Poiret models. that there is some technical truth in ]\lr. Shortrate's Hi\lavis doesn't think caviar is fit to eat unless the analysis. There are hundreds of thousands of persons Russian coat of arms is stenciled on each egg/' Ethylyn who are crying for thrills in ink but I am not going to Sartorius told the bridge club one afternoon. limit any newspaper of mine to a few comic strips, Mavis only laughed. She simply didn't care. She several doses of high pressure fiction and a photographer was thrilled by Dale's good fortune and she refrained with a trained menagerie of bathing. beauties. \Ye from commenting too freely ·on his obvious delinquen­ shall be able, I hope, to so edit the Fortunatus Gazette cies as a publisher. She was secretly planning to that it \\'ill be entertaining without scorching the hand tabaseD the humorous column on the Gazette's editorial that buysi!. I will not be the publisher of adailyaphro­ page. She had contributed to such columns of other disiac. I am n ot an anatomist and I don't want to sell newspapers but her offerings mostly came back. One a handbook on the human form divine to my neighbors columnist, pressed for time and weighed down by heaps and my neighbor's children. ]\lr. Franklin will produce of.maiI. used a rubber stamp in warding off the fast news, pictures, editorials and features that should ones from ]\18-Vi5 and her ilk. Their offerings went interest any norma] American public. l\lr. Burroughs back bearing the simple legend "Too hot to handle." ",ill sell that product. ]\lr. Shortrate will handle the Ma"is thought this "'as vulgar. She was pleased, by-product, ,,·hich is ad,·ertising. I hope I make my­ though, to reflect that she had saved the rejected self dear. If not are there any questions?" wheezes. The Gazette should have them all. It Can There was a silence in the dimly lighted room . be imagined with what delicious amusement 1\.lavi5 Babbitt mentally stamped it as a good speech but he listened to a conversation that took place at the dinner said nothing. Shortrate assured himself Daly Minimil table one evening in the l\iinimil's private fortress. ",as an ass but he didn't mention it aloud. Burroughs 1I1rs. i'Enimil ,,'as vastly proud of the family's made a great to·do about getting out a fresh cigarette. venture into journalism. She thought it was much A blush suffused the face of the enraptured handmaiden better to be referred to as Daly's mother than as the at the typewriter but the new tint could not prevail Colonel's wife. Of course f\ laximilian waS all right against a jade green lamp-shade and the lady merely but he "'as looking out from behind a set of old whiskers became saffron. at a new world he .did not understand. There were Franklin smiled at the Colonel. many things 1I1rs. 1I1inimil did not get in their full "A ne'," je,,'el in the breastplate of Athena," he mur­ significance, but she found time, what with fighting mured. ,servants and embonpoint, to step into the parade "Thanks for the buggy ride," replied the colonel, occasionally. She marched in an Independent 'Voman's giving Franklin a hard look. Then he turned to Miss Association parade one memorable day and her enthu­ Long. siasm was only slightly dulled by the fact that she "Sadie, the next time you see Bill Rossom just tell forgot in ,vhich ward she li"ve d and disco,Yered she was him forme that the Gazette will have the Clarion licked carrying a banr:er in a squad of ladies recrui ted from on selectivity, distance and yolume and that Q UI'S is the gas house district. a single ('ontrol set. Santa Claus is on the way to It had been an arduous day for Daly and the Colonel. Bill's place "'ith a sackful of static." The Gazette was to go on the news stands the following Tom Gubbins, foreman of the press room, and Dan night, with the early editions that make a morning O'Reilley, foreman of the composing rOOIn, entered the newspaper so difficult to distinguish from evening conference at this moment and sat gingerly on the for the Gazette's wagon and truck drivers and for the edges of their Louis XYI chairs as the conferees pro­ newsboys who were to handle the paper at stands ceeded to new business. Tom told Dan afterward all oyer Fortunatus and its en\;'irons. Bill Rossom of that he felt almost immoral. the Clarion had sworn that the Gazette should not be "\\'by does that bird han his office in a parlor?" sold from the stands that handled his Clarion. His he wanted to know. corner men had vowed they would not stand for com­ petition on their own corners o r on anv of the other III three corners a t intersections ",here the; merchandised MAVIS MINT MIL '\'as modern. She was so ad- their papers. The elder 1I1inimil had tried to make yanced that e\~en her dust was in'i:isible to her amicable arrangements with Rossom but had mace plodding father. The young woman talked frankly no progress. It looked as if the other six newspaper about things that made her mother cough. But she proprietors would stand with Rossom, giving him their was a good girl and earnestly wanted to be something moral, financial and whateyer other support the more than a rich man's daughter. She had tried settle­ common cause required. ment ·work, founded a home for waifs, financed a re­ Col. 1I1inimil and Daly had been discussing this search into the li"es of the boll weevil and corn borer, matter when 1I1rs. Minimil brought forward her firs. RADIO AGE for March, 1927 The Froth Estate 15 su~/gestion for .r,utting t.he ~azette across wit? a. bang. Dale, dear, she sald, you renlcnlber LIZZIe Far­ ley, the nurse who took care of Mavis after she fell off the front terrace wall into a clump of bridal veils?" Daly remembered vaguely. NWell, you can't tell how far a cat will jump," said his mother. "She never looked to me as if she had sense enough to pound sand into a rat hole but she's turned out to be a successful authoress. She wrote that fiction story in the Clarion entitled 'Pelted and Parted' and it went so strong they had her write a sequel called the 'Heart of a Typist.' " "Did that turn out to be strong, too?" asked Daly. HOh, extremely," exclaimed Mrs. Minimil. {(Very strong. And l\lr. Rossum is advertising her nOY\1 as The Tear Gas Bomb of Modern Letters." «High pressure pronlotion, I'll say," conlmented Daly. "You must have read some of the tHeart of a Typist,'" insisted his mother, "it has been appearing so long in the Clarion.n "Is it the one where (he working girl is engaged to an earnest young man and she meets a wealthy married business man and he Lakes her to a roadhouse and on the way back that night they spill in the ditch and-" What Mrs. Minimil thought of this will never be UDale, that's it. You have read it." known for just as she was about to express an opinion "Yes, mother dear, I 'wasn't sure at first but I recall of it the butler entered and announced that lIlr. Daly now that I came across it in the original Egyptian, was wanted at the telephone, "An urgent matter, written on papyrus." he said, sir." "Daly, do be serious for once. Y ou'lllove this. . "It's that danlned Rossom starting something new," met Miss Fairleigh this afternoon and she says she shouted the Colonel as he al"Qse to follow Daly into the has a story almost written which she will sell to the library. "There is a popular idea, l'layis, that the Gazette.1) next war is going to be in the air but I want to tell "I didn't get the name," said Daly, "did you say it -,"ou and lila that the next war is going to be fought 'was Farley or Fairleigh?" on the streets of Fortunatus. \\ ~ here " s my hat?" "Ysobel Fairleigh now, D il le. You know most artists change their names a bit '\-vh en they go before If" (he public." HAnd a very tasty appropriation," agreed Daly. BILL ROSSOM, owner and publisher of the For- "Now what is the name of the serial she wants to sell tunatus Clarion, was a lithe, tallish nlan of about (he Gazette?" 45 years who literally had been kicked into fame and " 'Who N ecks?' " wea lth. In his younger years he had determined to HPardon me?1J said Dalv. earn international acclaim as Bruneho Bill Rossom and

" 'Who Necks?' " v his first step was to undertake to ride a horse. He IISounds like a grocer's clerk with a hare lip," puzzled rejected \Vyorning and i" lontana as suggested scenes Daly, as Mavis laughed. "But I'll bite; who IS next?" for the burgeoning of his ambition and chose the moyie "~cksl Necksl Not next/' explained his mother, lots of Los Angeles. He soon learned to snatch a gun laughing inlmoderately, as matrons will, at the quaint from his holster in less than one minute and after a mistakes of their children. few trials " 'as able to ride bare-back without holding "Good Lord!" said Daly, "Sorry mother." onto the horse's TIlane. It ren1ained only for him to uYes," exclaimed Mrs. i"Iinimil "and I arranged develop a bi t of extra business. This consisted of everything with Miss Fairleigh except the price. standing on-the ground and, with an agile step and le'ap, thought you would want to decide about that. What alighting upon the back. of the horse, without the aid do you thi nk she should get?" of s tirrup, fence or horse block. Dale glanced at his father. "1'10ther," he said, "1 His big blue eyes and shock of straw-colored hair am not yet familiar with' the practice and technique stamped him as one fa vored of the movie gods. With in such cases as you have outlined but offhand I would what an inimitable air he could turn, just before killing suggest that wood alcohol would be just about (he the cattle rustler who had kidnapped Isis Osiris, the correct thin..e:." (Continued on page 45) , 16 RADIO AGE for March, 1927 Static and Statistics By Dorothy Brister Stafford

F YOU own a radio receiver obviously composed while the formation of the greatest com­ I you are perfectly familiar writer was suffering from an bination for organized broad­ with that grand and glori­ acute attack of liver trouble, or casting the industry has yet ous feeling of impotent rage in the darkest hour of the morn­ seen, and all the publicity at­ that comes over you when, with ing after the night before, it tendant upon the event it seems the batteries all up in shape, the nevertheless has filled us with a improbable that any sane per­ tubes burning brightly, and you righteous indignation that de­ son should give it credence, but all set to tune in on some fine mands immediate expression. so prone is the average reader program, up bobs old man Sta­ In the aforesaid arraignment to believe "what he sees in the tic and throws a wooden shoe the writer has gone to infinite papers" that we haven't a doubt into the machinery. It was with pains to convince the radio but that many listeners will some such comfortable feeling listener that the average large take it in entire good faith as a that we approached the type­ broadcasting station is con­ truthful expose of what is back writer today with a nice bunch ducted by a group of half-baked of their entertainment. Heaven of statistics that had turned up college boys and third-rate en­ knows radio is having a rocky on our desk, all primed to talk tertainers of the small-time enough road to travel this win­ about an anniversary that class, who regard their audi­ ter, what with the broadcasting proved beyond the shadow of a ence as a huge joke, and chaos and heterodyning moans doubt that our youthful prodigy operate on the theory that any­ developing on all our favorite of radio broadcasting was old thing is good enough for the wave-lengths without any addi­ enough to have a history, when listener out in Hicksville; and tional stones being fired in its something else came to light to the idea is very subtly gotten way from the inside. And why divert us to the extent that until over that broadcasting is not to a man who presumably makes a we can set down what we think be taken as a serious business, portion of his living out of the about it we are a total loss so as it is more or less of a side­ industry should take a nip out far as being an historian is con­ issue for those engaged in it. of the hand that is feeding him cerned. Personally we are at an utter will take its place alongside This disturbance was brought loss to understand just what a other great radio mysteries, about by the reading of a writer expects to gain by such such as why the queen failed "fable" by a "radio reviewer," an absurd and unjust attitude, to materialize when several which, if it has accomplished no or why an editor should print million people were waiting other purpose, has succeeded in anything so palpably designed breathlessly for the royal voice taking most of the joy out of to inti uence his readers against to come over the hook-up. The life this bright winter morning, the first rate stations. Coming charitable, friendly feeling of and while from its tone, it was as it does shortly after the the radio audience toward the

Readers who have tuned in KDKA for the past few years cannot have failed to hear the Little Symphony under the baton of Victor Saudek. The organization is shown in the accompanying picture RADIO AGE for March , 1927 17 seriously and employed a per­ courtesy and an overwhelming son with some general knowl­ interest in what the listening edge of music, a catholicy of public thinks of them. And ideas, and a genuine interest in why should it be otherwise? what he is doing, with the re­ Isn't the attitude of the public sult that the writer has raised of paramount importance in any his new profession to the dignity undertaking? True, it isn't of that of the critic of the possible for the great station to drama, literature or music. But extend unlimited invitations to too often the condition reminds every owner of a radio set to us of that existing back in our come around and be entertained early days when three or four when he is in the city-we've of us were sitting up with the never seen a busier place out­ corpse of a morning paper, and side a metropolitan newspaper the "Bessie Blake" column of office as the dead line ap­ advice to girls was done by any­ proaches than a big broadcast­ one who had no more pressing ing studio on an important duties at the moment. The night-but the one waking pathetic spectacle of the hard­ thought of all concerned seems boiled telegraph editor, his bald to be how the program is get­ head glistening with perspira­ ting on the air and how it is· tion, one suspender held up going to be received. If these Charles Heinroth, organi.st, has furnished a number of Sunday recitals through the with a safety-pin and the omni­ earnest toilers have anything in pioneer station at Pittsburgh present package of Mailpouch their heads besides radio we protruding from a hip-pocket, were unable to discover it. The purveyors of its programs is the wrestling with the problem of old story of the sailors who very life and breath of broad­ "Two Cuties" who want to spent their shore leave boat­ casting, and while all of us know if they shall invite th e riding in Central Park was re­ know of a score or more sta­ boy-friends in after a dance, called when we asked an ex­ tions we'd gladly see anni­ often comes back when we read tremely versatile young man, hilated for their interference some such authentic "revie"w" who bewildered us by the multi­ with the really important broad­ as the foregoing-for we can plicity of his duties, what he did casters, such a sweeping indict­ fancy it's being composed under when he went home, and re­ ment as this is bound to do no­ just such circumstances. ceived the prompt answer, body good. We presume the fact that we "Why, I turn on the set." One wonders if such a condi­ have just unpacked our hat-box tion isn't made possible by the after a trip to the Big City, Spirit of Youth fact that the position of "radio where we like to go each winter RUE the spirit of youth is reviewer" on the average news­ to see some shows and meet T rampant-but where isn't paper is a most nebulous oc­ people who are doing things, it these days? Aren't some of cupation at best. When, in the and which this year included the most momentous things in course of human events, the visits to some of the more im­ literature, art and drama being conventional editor discovered portant studios with the result he had to have a radio page, h e that we are brimming with didn't know exactly who was enthusiasm and admiration for going to do it. If the paper the way they are conducted, boasted a musical critic, the has something to do with our buck was usually passed to him, disturbance over such a prej­ with the result that he con­ udiced distortion of facts. We demned everything outside the admit that we don't lo ve and realm of classical music and admire the ways and person­ usually succeeded in utterly be­ nel of all radio stations-we wildering the bulk of the radio haven't had several years con­ audience. We know of one in­ tact with the business without stance where the radio page is discovering some clay feet­ handled by the sporting editor, but just as all the really great simply because he happens to people we have ever met in any be a radio bug-and the result, profession have been the sim­ while doubtless snappy reading plest and the kindest, the in­ to some listeners, must wring dividuals and the stations that the heart of any program direc­ have disillusioned us are those tor who reads his account of a that don't matter very greatly. symphony concert. There is the The atmosphere of the great occasional exception where the broadcasting station is one of Alice King, soprano, is frequently heard editor has regarded the matter amazing efficiency, extreme from KDKA 18 RADIO AGE for l\iarch, 1927 features-has been invariably, features, and while to those of "How do they like us out in us who are accustomed to the your neighborhood?" "Are we highly specialized broadcasts getting over?" Do they care of today those initial experi­ about the radio audience? ments would undoubtedly seem Well, rather. very crude, it is interesting to And while we have had no note that they paved the way such personal contact with the and set a line of conduct that is artists and staff at KDKA, we stilI adhered to by practically know the same spirit exists at every' standard station in the the Westinghouse station, or it country. Those trail blazers wouldn't now be celebrating its must have had an exciting time sixth season and recelvmg with no established precedents honorable mention as the dean to follow, and it is a matter of our broadcasters. Think of worth noting that a religious it! Radio is so new to the most service should be practically of us that it seems incredible their first attempt, for one that anything connected with it would naturally assume that could be having a sixth anniver­ there would be some timidity in sary. But an interesting series producing anything so radical of dates has been furnished by until the attitude of the listen­ Christine Miller Clemson is another of the Pittsburgh station, which ing public had been determined. the sopranos who is frequently heard But apparently timidity and from the Westinghouse station at Pitts· will constitute the Genesis of burgh the history of broadcasting lack of assurance have played when it is written. no part in the history of broad­ done by those under thirty? It was Nov. 2, 1920, that casting. The rash pioneers And you may be sure, in KDKA first went on the air to were willing to try anything the great broadcasting station do regular broadcasting, and once, and one supposes that the where there is a position calling the subject matter was the re­ explorers at the receiving end for a man of more years and sult of the Harding-Cox elec­ were so amazed by the marvel discretion, that is just the sort tion. other interesting first of being able to hear anything of a person you will always find time performances include Jan. that they bore little relation to holding down that job. Where 2, 1921, when the first service the critical, over-pampered lis­ there is need for youthful was broadcast direct from a teners of today. vision and unspoiled enthusiasm church; Jan. 15, 1921, marked Speaking of this pioneer sta­ there is invariably an energetic the first pick-up from a banquet tion, one feels safe in saying younger man bubbling over hall where Herbert Hoover was that there is no dial-twister with the joy of living and the the principal speaker. Feb. 18, throughout the land, no matter opportunities of this great new 1921, was the first pick-up from (Continued on page 34) field. We should like to take a hotel, and the same date must the Writer of the derogatory have been a great day in Pitts­ article into the station we have burgh for it was then that the in mind for an hour or so, and first report was received that if he didn't eat his ill-assorted KDKA had been heard outside collection of words before he the United States, the confirma­ got out it would be because he tion coming from London and would be so consumed with several points in Canada. April chagrin that his epiglottis 11 of the same year marked the would refuse to function. We introduction of the prize-fight want to devote an entire article to the air, when Florient Gib­ to this particular station at some son, sports announcer, gave a future date, and will now get on blow-by-blow account of a with the business in hand, lightweight battle direct from which has to do with that grand the ring-side, paving the way old patriarch of broadcasting, for the Dempsey-Carpentier -KDKA. But we would like contest in Jersey City the fol­ to tell you that the first question lowing July. Beginning also in of all these busy broadcasters April the regular broadcasting we've met lately,-Ieaders of of baseball scores was inaugu­ great orchestras, busy young rated by KDKA. men who are conducting half a Jim Hughes, director and announcer of dozen different musical units, Trail Blazers the Teaberry Entertainers. This feature is opera singers, musicians who N FACT it appears that we one of the largest permanent broadcast­ I ing features on the air, consisting of a divide time between concert are indebted to Pittsburgh twelve piece symphonic orchestra and engagements and commercial for practically all our standard quartette, heard weekly through KDKA RADIO AGE for March, 1927 Current Science 19

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Science Amateurs Do Good Work

o LONGER is the typical N scientist a stooped gray­ beard, who wears a long coat and spouts jawbreaking words· in Latin and Greek. As Listening in on First a matter of fact, he never was, New York-London Talk but today there is even less jus­ The first tel~phonic channel of speech tification for the myth than ever between London and New York was recently opened when Walter S. Gifford, before. To people who still President of the American Telephone cherish the old tradition, how­ and Telegraph Company spoke from his ever, a visit to a scientific meet­ New York office to Sir Evelyn Murray, secretary of the General Post Office of ing such as that of the American Great Britain in London, officially dedi­ Association for the Advancement cating this newest achievement in science. of Science, which was held in Photo shows Mr. Gifford speaking for the first time with London while officials Philadelphia during the holidays, ofthe A. T. & T.listen in. Left to right­ would be a revelation. Here E. S. Bloom, president of the Western Electric Company; F. B. Jewett, vice were gathered nearly 5,000 work­ president of the A. T. & T.; J. J. Carty, ers in all fields of science, from vice president; Walter S. Gifford; Ban­ Archaeology to Zymology in the croft Gherardi, vice president and chief Psychologist Demonstrates engineer; E. B. Craft, executive vice New Crime Detector alphabet, from Astronomy down president Bell Telephone Laboratories; to Geophysics in the subjects of N. T. Guernsey, vice President; A. W . Dr. A. P. Link, Instructor in Psychology Page, vice president at New York University, recently demon­ which they treat. Among this strated how with the use of specially 5,000 were many of the leaders devised apparatus to measure the elec­ trical resistance of the human skin an in their fields, but the long beards electrical stethoscope which enables the were in a very small minority. audience to hear the thumping of the Those lucky people who go to heart of the person under examination, science can aid in detecting and appre- Florida for the winter will be hending criminals able to see another amateur ob­ servatory which has been estab­ lished in Miami by S. Lynn Rhorer, and is now in its fifth season. At this observatory a battery of telescopes is used Ship on Wheels May every clear night to instruct visi­ Solve Travel Problem tors in the mysteries of the The future" ship of the desert" will not heavens. be the traditional camel, in the view of HERE is a large class of Johann-Cristoph Bishoff, a Kiel inventor, who has evolved a craft which he believes T stars kno,vn as "variables" will meet all modern demands for speed, which change in brightness more effectiveness and freight and passenger carrying capacity in traversing the or less periodically. Most of earth's arid regions. The" desert ship" these are bright enough to be is really a gigantic motor vessel, nearly seen with a small telescope, but 300-feet long, 38 feet in breadth and standing about 50 feet high, resting on to check up on their variations, four huge wheels nearly 40-feet in diam­ a large number of observations, eter. The strange craft will accommo­ date 300 persons and have a capacity made · fairly close together, are for fifty tons or more of freight. And Makes Experiments required. The A. A. V. S. 0., as it is estimated it will be able to travel it is called, with its large num­ about twenty miles an hour. Powerful With Tesla Coils gasoline engines supply the motive pow­ Doctor Raymond Morgan, professor of ber of small telescopes, watches er. Photo shows a sketch of the monster physics in the University of Pennsyl­ these and its members report "desert ship" showing the comparison vania ·who gave an illustrated lecture on regularly to the Harvard Ob­ in size with the -old mode of travel- radio communication with elaborate the camel. experimental demonstrations servatory. These amateur as- 20 RADIO AGE Jar March, 1927 Current Science ticed a star in the constellation of Pictor, the "Painter," which he had never noticed before. This was the new star of nova, and its discovery was immediate­ ly spread far and wide to astron­ omers throughout the world. Another amateur discoverer of comets, as well as of "asteroids" or small planets, was the late Rev. Joel H. Metcalf, a Unitarian The Southern Cross Observatory at minister of Winchester, Mass. Miami, Florida, established by an amateur But astronomy is by no means astronomer, S. Lynn Rhorer, of Atlanta, for the purpose of instructing the public George Langford, the factory executive the oVly science that has its ama­ in the mysteries of the heavens who turned archaeologist to make one of the most important discoveries in America, teur devotees. Take the instance relating to early Indian civilizations, of a prominent New York invest­ played an important part in our shown at his "diggings" ment banker, who lives in one of colonial history. Previously, no tronomers are drawn from all the city's suburbs, Tuxedo Park. remains of the Iroquois have walks of life-one very active This man, Alfred L. Loomis by been found west of Ohio, but in member, until his recent death, name, has established at his home the second layer of the Fisher was a Pittsburgh locomotive en­ a private laboratory where he is mounds pottery, ornaments and gineer, who came in from his run experimenting himself, and aid­ weapons suggestive of the work­ about midnight, and then ob­ ing other scientists to experi­ manship of this race have come served until daylight. ment, on "long shots"-scientific to light after remaining buried Somewhat similar to him is an problems that offer too little im­ for many centuries. And under amateur astronomer in South mediate return for the average them are relics representing a Africa, R. Watson, who already university laboratory to investi­ still earlier group of Indians, has the discovery of several gate, but that may develop into about which little is yet known. comets to his credit, as well as something of importance. Altogether, Mr. Langford has a "nova," a new star which In an entirely different field of found hundreds of skeletons, as flashed out from previous ob­ science, that of archaeology, a well as enormous quantities of scurity into brightness for a hard-worked factory executive in the other relics. time, then dying out again. Mr. Illinois has distinguished him­ So science is not the dry study Watson is a telegraph operator, self, George Langford, of Joliet, of uninteresting facts nor is it on a night shift, and when he has taken up Indian mound ex­ necessarily a solemn pursuit fit returned to his home early one cavating as many men take up only for greybeards. When men, morning, when other respectable golf. At that, he gets more exer­ and women, from all walks of life people were sound asleep, he no- cise than most golfers, because take it up as a hobby, and are what he has to do in his hobby able to help advance it, there is to work all day, when he has must be something in it of in­ one to spare, with a pick and terest! shovel like an ordinary laborer, with only one volunteer assistant to help him. But already his hobby has developed into a real pursuit of science, with impor­ tant results, which has already won for him a place in the circles of his chosen science. His digging has been at the "Fisher mounds," near Joliet, and is important because he has unearthed three, and perhaps, four, layers of remains of Indian civilizations, that existed on the spot at various times in the past. In Old World archaeology sev­ eral layers of culture above each other are not unusual, but it is rare in America. Another im­ portant outcome of Mr. Lang­ Joseph Priestley, the 18 century c-Iergy­ man who distinguished himself by the ford's work is that for the first Hon. James Hartness, former governor discovery of oxygen. In the later years time a possible clue has been of Vermont, with the turret telescope of his life, he was forced to leave England which he invented and constructed. A for religious reasons, and he settled near found to the earlier home of the tunnel connects the observatory with Philadelphia Iroquoian Indian nation, who his home, a few hundred feet away RADIO AGE for March, 1927 Current Science 21 March Evening Skies AnnilJerJ'ary of Disco(Jery ofPlanet Uranus By J AMES STOKLEY (Science Service)

HOUGH the heavens have since then. On the 21st, the spheroid, which means, in the T little to offer in March in sun will not be in the constella­ case of the earth, that it bulges the way of such spectacu­ tion of Aries, but in the neigh­ a little at the equator, just like lar occurences as eclipses, there boring one of Pisces, the Fishes, some of the people on it. This is one event which is always and it will be some 23,000 years is caused by the centrifugal welcome, and happens on the until the signs again fit the con­ force due to the earth's rotation. 21st at 9 :59 a. m., Eastern stellations. When you spin a weight around Standard Time. That is the your hea d on the end of a Bulges at Equator Vernal Equinox, when the sun string, it tries hard to flyaway, crosses the equator on its way HIS precession of the equi­ but the string keeps it fr om do­ north, and Spring commences, T noxes is a result of the fact ing so, unless you let go. In the bringing along its assortment of that the earth is spinning. We same way, the part of the earth back-lots baseball, hurdy-gur­ usually think of the earth as at the equat or tries to flyaway dies, and poems on spring. But being a sphere, but it is real­ from the center , but the for ce even though the winter has ly not spherical. It is what of gravity keeps it from doing been fairly mild the season is al­ mathematicians call an oblate so. H owever, it does succeed in ways welcome, despite the poems and hurdy-gurdies. Since the path of the sun, in which the planets also move, or the zodiac, is divided up into " CHA~IOTEER twelve equal "signs," another ..'capella way of expressing what hap­ pens at the vernal equinox is to say that the sun enters the sign of Aries. Aries is a constella­ tion which could be seen in the evening a few months ago. Now it is too near the sun to be easily visible, even though the sun is .. not in the consellation when it is in the sign. The zodiac is not a recent invention. It was estab­ lished thousands of years ago, WEST NORTH when men thought the part of EAST the sky the sun was in had some mystic influence. on people born at that time. Though such ideas have long since been given up by reputable scientists, some of the old terms are still used. In fact, the observations of the old astrologers, misguided though they were in their motive for studying the stars, rea I I y formed the foundation for the modern science of astronomy. A few thousand years ago, the constellation of Aries coin­ cided in the sky with the sign of Aries, but owing to what is called "precession of equi­ EAST SOUTH WEST . noxes," the skies have changed 22 RADIO AGE for March, 1927 Current Science getting a little farther from the tries, the beginning of the year. Gemini is associated with an­ center than the surface at the But if we go back about 6,000 other important astronomical north or south pole, with the re­ years, Aries had not yet reached event, the anniversary of which sult that the earth is not per­ the position of the vernal equi­ comes this month. The ancients fectly spherical. Another inci­ nox, and the constellation Gemi­ knew only the naked eye plan­ dental effect of the earth's cen­ ni, the twins, visible these eve­ ets, Mercury, Venus, Mars, trifugal force is that a person nings in the southern skies, held Jupiter and Saturn. Sir William weighs less at the equator than this important post. It has been he would at the North Pole, be­ said that its stars represent a Herschel was the first to add to ca use this force tends to throw pair of twins and symbolize the them, and on March 13, 1781, him away from the surface. Of equal length of day and night he discovered Uranus. In "The course, no scales would show at this time of year. Some simi­ Watchers of the Sky," Alfred the difference, because the lar symbolic meaning has been Noyes has Herschel say, refer­ weights also would be lighter. claimed for a mythological story ring first to the reflecting tele­ But the diminution of gravity about the twins. Castor and scope with which he made the at the equatorial regions can be Pollux were their names, and discovery: measured experimentally in an­ they were the sons of Leda. other way, for the swing of a They possessed what might be ". . . . . It was the w01'k of m'y pendulum varies with the inten­ termed alternate immortality. own hands, sity of gravitation. As soon as one was killed, the A new one, 1vith an eye six inches other revived, and this, it has Gravitational Effects wide, been held, symbolizes day and EAVENLY bodies all exert night. Bett81' than even the best that H more or less gravitational Ne1vton made. Probably the earliest record effect on each other, depending of any astronomical event is as­ Then, as I turned it on the on their mass and distance. Be­ sociated with Castor and Pol­ Gemini, cause of its proximity to us, the lux, the two stars of the Twins, And the deep stillness of those moon has considerable effect on or alpha and beta Geminorum, the earth, producing the tides, constant lights, as the astronomer calls them. for example, and so does the Casto?' and Pollux, lucid pilot­ On ancient Babylonian monu­ sun. If the earth were a per­ stars, ments and boundary stones, fect sphere the gravitational ef­ archaeologists have frequently Began to calm the fever of my fect of the moon would be the blood, same regardless of its position. found what is called the "Triad of Stars"-a crescent moon, As it is, except at the fourteen I saw, 0, first of all mankind I day intervals when the moon is with the horns upward, and two saw directly over the earth's equa­ stars beside it. The disc of my new planet gli­ tor, the moon's gravity acts Ancient New Year ding th81'e more on the parts of the earth's A CCORDING to an English Beyond our tumults, in that realm bulge near it than the part on of space." the opposite side. The result is ft astronomer, E. W. Maun­ that it tries to pull it into the der, the two star! represented Uranus is now in the morn­ same plane again, but as the Castor and Pollux. At the time, ing sky, but it is so faint that a 6,000 years ago, the priests keeps it from responding to the telescope is always necessary to earth is spinning, its momentum were interested in the first new moon of the year, for their reveal it. Venus and Mars are pull. However, in combination both visible in the evening sky with a similar effect of the sun, calendar depended on the moon this month, however. The for­ it does cause the earth to turn as well as the sun, and the year slowly, so that a line drawn di­ began at the vernal equinox. At mer is in the constellation of rectly up from the north Pole this time of year, in BabylonIan Taurus, in the southwest, not will trace out a circle in the sky. days, Castor and Pollux could far from the first magnitude In 28,500 years, the circle be seen low in the western twi­ star Aldebaran, which it re­ would be completed. Another light just after sunset, and sembles, both in brightness and result of the "precession" is when the new crescent moon color. Mars, however, may be that what we call the pole star appeared alongside them, it recognized, because it is to the was not always such, nor will it was the signal to the priests north. Venus can be seen low always be so, though for the that the new year had started. in the western twilight, espe­ So important was this phenom­ next few centuries it will be cially towards the end of the enon that they recorded it on close enough for most of us. month, for then it will set about Aries, then, a few thousand their boundary stones and monuments to be preserved to two hours after the sun. It so years ago, was the constellation bright, about six times as bright in which the sun appeared at this day. as Sirius, the brightest star, that the beginning of spring and this Coming down to more mod­ was also, in many ancient coun- ern times, th e constellation it is easy to distinguish. RADIO AGE for March, 19 27 E,'eryday Jl echallics 23 Everyday MechaniCS

Use X-Rays To Detect Fake old method brushing its cob­ Pearls webs off after over half a cen­ ITH the growing use of tury of disuse in the United Wimitation pearls almost in­ States. In France it is older distinguishable from the real yet, for there the production of article, as well as of the so­ oil from shale started in 1838, called "culture" pearls grown according to Dr. G. C. Riddell, by introducing small bits of for­ consulting engineer of New eign material inside the shell of York. In Scotland, oil was ob­ a living pearl oyster, it has be­ tained from shale before 1850, come increasingly necessary for but the best of the raw material jewelers to possess some infal­ is today exhausted. Shale pits lible method of distinguishing 3000 feet deep show how the these manufactured articles industry once flourished. from the real pearls produced In 1850 oil was distilled from naturally by the pearl-bearing shale in Utah and Pennsylvania, shellfish. Science has come to and the development of a great the rescue with several devices shale industry would have re­ which measure the properties of sulted but for the discovery of a pearl or which permit the well oil. The "liquid gold" fever following the develop­ Automatic Train Stop jeweler to look through it un­ Device is Demonstrated der an enormously powerful ment of oil in drilled wells in Pennsylvania caused the inter­ A new c:lectric device for halting trains light, thus disclosing, if the a~tomat1cally and which practically pearl be not too large, the tell­ est in shale oil to dwindle and ehminates possibilities of crashes, was tale central impurity of a cul­ then die, just as an impending demonstrated on the Reading railway scarcity has brought it to life near Win~low Junction, New Jersey. ture pearl. A new and more The. eloctI"lcally controlled safety device, universal method, making use again. coshng $750,000 to install, acts independ­ To date 186 patents have ently of the engineer. When the locomo­ of X-rays instead of light rays, tive reaches the danger zone it automat­ was described recently to the been granted in the United ically sets the air brakes and the train French Academy of Sciences by Stat es for the production of oil comes to a dead stop. A special train from shale. Five of these were made up of two coaches and drawn by J. Galibourg and F. Ryziger, of the Reading's fastest locomotive going Paris. A narrow beam of the granted in 1858, fifteen in the at a speed of 85 miles an hour was brought next six years, and none at all to a dead stop during the test. Photo X-rays is thrown against the shows the train stopped at the signal pearl, beyond which is an ordi­ after that until 1891. From post by the automatic device nary photographic film covered 1891 to 1914 ten patents were with black paper, as are the gr!lnted, from 1915 to 1919, films used by dentists to take thIrty-four and from then to the X-ray photographs of teeth. present time one hundred and On this film there appears a pat­ seven. tern of dots made by the X-rays. The competitive production This pattern indicates the inter­ of oil by distilling bituminous nal nature of the pearl. With r ocks is no longer in doubt, Dr. proper care, it is said that any Riddell states, for in California culture pearl can be distin­ it has been produced for three guished thus from the genuine years at less than one dollar a article. barrel including all overhead charges. This is far below the average cost of American well Shale Oil Industry oil. May Rival Coal The question as to what is to DISTILLATION of s hal e, become of the vast amount of which promises to become spent shale that will result with very important to the entire na­ the development of. the industry tion, is not a new way of get­ is puzzling many theorists. The Photo shows Philemon S. Lewis, superin­ by-product can be used for te~de.nt of the Atlantic City Division ting oil at this time of approach­ pomtmg to the control box on the side ing scarcity, but is merely an making pressed, refractory and of the locomotive 24 RADIO AGE / or March, 192 7 Everyday Mechanics insulating brick and tile, Dr. blocks and as a filtering sub­ Eavesdropping Is Hard Riddell says, and at present it stance in the sugar industry. on Transoceanic Phone has found lesser uses as road That the new shale industry material, concrete building is destined to become as great ARD times are in store for as the coal industry is now, is H any transatlantic gossips recognized by engineers and ge­ who might wish to indulge in a ologists generally. The new little eavesdropping on the new business will be developed in overseas radiophone service re­ the now sparsely populated re­ cently opened. Officials of the gions, Dr. Riddell points out, American Telephone and Tele­ and towns, roads, water sys­ graph Company state although tems, movies and other kinds of absolute secrecy of the transat­ civilization will appear there. lantic telephony is not guaran­ teed, it will be difficult to listen Light Shining on Mineral Pro- in because a special transmit­ duces Electric Current ting system is used. This is the PIECE of the mineral mo­ suppressed carrier method, by A lybdenite, one of the chief which the voice is sent through sources of the metal molyb­ the ether without a carrier denum, used in steel manufac­ wave. In the ordinary receiver, ture, may replace the fragile an unintelligible jumble is all photoelectric cell in some forms that one hears, but when a re­ of scientific work, says Dr. W. W. ceiving set is used that restores Coblentz, of the U. S. Bureau of the missing carrier, it is fully Standards. understandable. Wind Tunnel Used to Test Dr. Coblentz has been study­ Another difficulty of listening Aerial Bombs ing what he calls the actino­ in, at least so far as the United An engineer of the Bureau of Standards electric effect of molybdenite, States is concerned, is that the is shown in the process of testing aerial the property that causes it to signals from London are so bombs fOT resistance to help airmen in getting accurate hits. The air tunnel convert light energy falling on faint. It was in order to get in which the bombs are tested has an it into electrical energy. Prev­ them as loud as possible that artificial velocity of air current equal to iously he found that pieces of 80 miles. Engineers of the Bureau also the telephone company placed use the tunnel for testing of airplane the mineral have closely ad­ the receiving set at Houlton, accessories jacent spots which generate Maine, 700 miles of long dis­ either postive or negative elec­ tance lines away from New tricity. The result is that when York, so that at best, an inter­ the whole crystal is exposed to loper would only be able to light the positive and negative hear one side of the conversa­ currents neutralize each other, tion. and very little effect is noted, but if a single one of the spots r::" ~iIi;::;~Y"~;;::P1 is selected and illuminated, a r;:a... current is produced of sufficient intensity to be indicated with a galvanometer. Very recently, Dr. Coblentz has found crystals in which all of the sensitive spots give the same kind of electricity, either World's First Magazine for the positive or negative. When one Blind of these crystals is completely Introduced by its blind inventor into illuminated, a considerable cur­ Los Angeles several months ago, the rent, as compared with the first monthly magazine for the blind proves so popular that it is enlarged to others, is produced. By using Engineers Wear Overcoats in 60 pages for national circulation. "The vacuum tube amplifiers, such as This Engine Room Braille Mirror" became possible as a result of the invention of special presses are used in radio, the current For the first time in the history of the and stereotypes by J. Robert Atkinson, may be magnified greatly and American merchant marine an engine its publisher. Mr. Atkinson, stricken the crystal made available as a room crew were in danger of freezing on with blindness at 35 years of age, had no an ocean voyage. Ordinarily the warm· previous experience in the mechanical delicate detector of light. est part of a vessel is its engine room. line before he began his experiments. Such a crystal is sensitive to But the converted motorship "Tampa" The magazine covers a wide range of with its Worthington Deise1 engines give subjects and enables many blind persons the visible light waves and to off no heat whatever, owing to their to read advertisements for the first time the infra red, or heat waves, elaborate and highly efficient cooling in their lives. Picture shows a blind which are similar, but vibrating systems. On a trip to Bremen made operator at the typesetting machine recently, the engine room gang of the invented by Atkinson too slowly to be visible. Tampa wore overcoats on the trip acrOss RADIO AGE for March, 1927 25

Building Ideal Model of the Worlds Record Super 8 Brings Set Up To !u Highest Efficiency . RACTICAL work on the shown in Figure 2 on page 27. P various models of the By F. A. HILL Do not try to wire the set from • Worlds Record series has (Auociale Editor) this drawing. Use the schematic now reached a climax with the on page 31 (Figure 4) for the presentation of the Ideal Model superheterodyne, and the sche­ in this month's issue of RADIO matic on page 30 (Figure 3) for AGE. While no great departures the power compact. However for have been made in the basic cir­ the location of. the various ar­ cuit, a few refinements have been ticles the layout shown in Figure added to bring the set up to the 2 will give a clear idea to the maximum of efficiency and the home constructor for whom these minimum of working parts. articles are written. . For one thing the subpanel Photographically on page 29 method of assembly has been util­ is shown a bottom view of the ized to give greater symmetry to subpanel assembly. Some of our the wiring and the arrangement readers have tried with disas­ of the parts. This has also per­ trous results to wire up a set mitted the mounting of bypass from a photograph. We suggest condensers and intermediate in the interest of accuracy (and transformers beneath the sub­ economy of your own time) that panel. you use the regular schematic Both the front panel and the for that purpose--at best a subpanel are 7 by 26 by 3-16 photograph can only show the inches. The dimensions of the parts and wires but without re­ front panel are shown in the blue­ gard to their electrical accuracy. print Figure 1, lower portion. The upper portion of the draw­ EFORE com~enting on the ings on page 26 shows the top B receiver itself we will refer view of the subpanel with the line to the Thordarson R-171 compact of sockets and the two audio shown schematically in Figure 3 transformers and one output In this photograph is shown the 171 on page 30. Inside the dashed transformer in place. power compac t whL h furnishes A (urrent lines will be found a 110 volt. AC for the 171 tube filamen t; Band C volt­ Arrangement of the apparatus ages for the 171 power tube, and the B primary; a 5 volt AC, center underneath the subpanel is voltages for the balance of the receiver tapped, secondary for the fila-

28 RADIO AGEJor March, 1927 ments of the 171 tube; two 30 reserve of power in the compact henry choke coils; a high voltage LIST OF PARTS arrangement than in any of the secondary, also center tapped, (Articles shown below were previous forms of B eliminators. used in the model constructed by and two one-half microfarad buf­ members of the staff. Other Filament battery elimination fer condensers which are to go parts of equal merit may be used is secured from a 5 ampere Bal­ across the elements of the full if desired.) kite charger through an Abox Receiver wave gas tube rectifier. The high 2 Remler .0005 mfd variable filter which works perfectly. voltage condensers, C3, 4, 5, 6 condensers Going now to the super itself and 7 are contained inside the 2 Selectone type 400 long wave the wiring diagram is shown in transformers Tobe Deutschmann block for the 2 Selectone type 410 long wave blueprint Figure 4. A center 171 compact. Proper connecting filters tapped loop is used in order to lugs are provided on this block so Thor radio frequency coupler gain regenerative qualities in the (plug-in type) that connections from it to the 2 Silver-Marshall audio trans­ first detector which instead of Thordarson compact may be formers using a grid condenser and leak, made as short as possible. Silver-Marshall output trans­ makes use of the rectifying prop­ former Fixed resistances may be used 1 Qualitone center tapped loop erties of a grid negatively biased. if desired (and we personally 3 Sangamo 1 mfd bypass This bias is obtained from a com­ prefer them) but in this model densers mon C battery which also car­ Sangamo .006 mfd fixed COD­ two variable ones, made by Allen­ denser ries the pickup coil of the oscil­ Bradley and running from zero Sangamo .002 mfd fixed lator and the grid return of the denser to fifty thousand ohms, are used. Frost 6 ohm filament rheostat second detector. Thus rectifica­ Their position is also shown in Frost 100,000 ohm variable tion in both the first and second the schematic. The fixed 10,000 resistor detectors is by the bias method, ohm resistor in series with the 1 Atnperite 4-A for 1 ampere 1 X-L variodenser type N while the pickup coil is located in variable resistance controlling 1 Jones base mounting plug this line because of its being the 45 volt output is an Aerovox 7 Carter imp cord tip jacks more or less at a low potential while the 2,000 ohm resistor in 1 Silver-Marshall RF choke coil position in the circuit, obviating 1 7 ~2 volt Eveready C battery series with the center tap of the 2 Formica 7x26x3/16 pane" the necessity of long wires in the filament transformer and the 2 Benjamin standard panel actual grid line itself. negative B is an Allen-Bradley, brackets Filament control has again 8 Benjamin cushion sockets for cartridge type. Rectifier tubes su bpanel mounting been simplified. This time the used with the compact were the Abo" filter first and second detectors, the os­ new 85 milliampere tubes made Balkite 5 Ampere charger Cillatorand the first audio tube by the Q. R. S. interests in Chi­ Power Compact filaments are placed on a one am­ Thordarson R.171 power com .. cago. These tubes have been run pact pere Amperite (4-A) which is up to their manufacturers' rating Tobe DeutsoChmann condenser shown as R2, while the three and have given excellent results. block for same intermediate filaments are placed 2 Allen-Bradley 0-50,000 ohm They fit in the standard UX sock­ heavy duty variable resiators on a 6 ohm rheostat, Rl, and may ets and thus require no special Allen-Bradley 2,000 ohm car­ be varied as desired. A further method of assembly. tridge resistance control is a 100,000 ohm variable Aerovox 10~000 ohm fixed re­ In the upper section of Figure sistor resistor placed across the pri­ 3, are shown the first and second Q. R. S. 85 milliampere full mary coil of the last iron core in­ audio stages of the receiver. The wave rectifier tube termediate, as shown in the sche­ filament of the 171 tube being AC matic. is not supplied from the set itself rect current from the loud Tuning control is accomplished but from the 5 volt winding of speaker windings. by a .0005 mfd. Remler on the the 171 compact. Grid bias for If desired the entire power left side of the set which spans this tube is secured through the compact may be encased in an the loop circuit, while another 2,000 ohm resistance between the iron (or other metal) container Remler .0005 mfd. at the right center tapped filament trans­ as shown in the photograph on goes across from grid to plate of former and the negative B line. page 25. This permits not only the oscillator tube. A Sangamo This bias will be automatic and portability and neatness of ap­ .006 mfd. condenser is put in depend upon the amount of cur­ pearance, but also allows the set series with the variable condenser rent consumed in the plate cir­ owner to use the compact as a to act as a protective measure cuit of the 171 tube. Please no­ source of power for any other against accidental shorting of the tice that while the grid return of receiver he may happen to have variable condenser plates and the first audio transformer goes on hand, providing the last tube this adding another victim to the to the negative of the set's C bat­ in such receiver is changed over tube morgue which most experi­ tery, the grid return of the sec­ to use AC on the filament of the menters maintain. This fixed ond audio goes to the negative A 171 tube. Those who have been and B whence it secures its bias accustomed to the small rating condenser will not have any on account of the 171 filaments B eliminators of any kind, will perceptible effect upon the tun­ not being a part of the set fila­ be somewhat startled at the in­ ing of the oscillator circuit, al­ ment supply. The output trans­ crease in quality on all tones due though its inclusion will prevent former is used to isolate the di- to a power tube and a greater accidents. RADIO AGE for March, 1927 29 OR the loop input terminals issues. In its operation by the can muddle up KFI's wave into F three Carter imp cord tip staff the contested points were a distorted tone. One of the eve­ jacks were used. Another two rechecked to see that nothing had nings on which the receiver was jacks of the same type were used gone amiss in its construction or in operation Los Angeles was for the filament terminals from in the peaking of the interme­ brought in at 8 p. m. Central the compact, while two more diates. Hotbeds of radio dissen­ standard time, which was consid­ jacks were put on the subpanel sion on most receivers center ered fairly neat work. No tests for the output transformer leads around 970 kilocycles, 670 kilo­ were made on the set Monday to the loud speaker. cycles and 640 kilocycles, and it nights for obvious reasons. Drilling templates for the Ben­ was our desire to see that ten When KRLD at 840 kilocycles jamin sockets to be mounted kilocycle separation was possible is not on the air, CZE Mexico directly on the subpanel are fur­ with this receiver as with the City may be tuned in on the loud nished with the unassembled previous ones. Between WGN speaker. During intervals when sockets. The inch holes may be on 990 kilocycles and WGES on WCFL is not on the air (and made either with a one inch fly­ 950 kilocycles there should be WEAF is not too strong) KGW cutter, or a circle of small holes KOIL 980, KDKA 970, and may be brought in although this may be drilled and the center CNRR 960 kilocycles. These will depend much mor e on luck knocked out. For speed in con­ three should be neatly separated than on design since this West struction a panel cutter that will if utmost advantage is taken Coaster is not particularly per­ make an inch hole will be much of the directional effects of the manent as to volume. more satisfactory. loop. A few last words before finish­ Bias on the intermediate grids Ten kilocycles below WQJ on ing the series on the World's is secured from the common C 670 kc you should pick up was Record sets. If blasting occurs battery and will be somewhat on 680 kc, while ten kilocycles on locals shift to a 112 in the first critical for best results. The above WQJ you should have no detector stage and go back t o audio bias will generally run t rouble in tuning in WJ Z on 660 a 200-A or 201-A for long dis­ from 1Y2 to 3 volts negative. kc. The same should hold true tance work. Do not keep the loop Regeneration in the loop is con­ around KFI on 640 kc, with KMA too highly regenerative since too trolled by the X-L variodenser on 650 kc and WF AA on 630 kc. much regener ation will introduce which should be set for a value With this set KFI became a dist ortion into the signal. Use which will give regeneration (but laboratory criterion f or recep­ voltages (plate) as shown in the not oscillation) at a point about tion on his signal strength sev­ schematic because these values midway between the upper and eral adj ustments being made to have been worked out for best lower' ranges of the broadcast see if the volume could be quality. Do not expect louder channels, say about 300 or 333 brought up higher. Loud speaker signals on the 171 than on the meters. Then the condenser may volume on KFI with perfect tone ordinary tube, but do look for be left alone and the set logged quality was secur ed without trou­ better quality. Do not place by­ easily for the entire 94 broadcast ble and maintained night after pass condensers too near to air channels. night. The occasional exceptions core filters since their proximity In this article we are not much were when WAPI down in Ala­ to the metal might alter the char­ concerned with the logging of bama per sisted in polluting the asteristics. Do not build the set the receiver, since it will r un air with thir d rate music, which in a hurry- take your time and quite true to form with the others we feel did not suit t he taste of make it a worthwhile job for you which appeared in the Novem­ our distance hunting r eaders. will probably keep it for some ber, 1926, and the January, 1927, At times WRC in Washington time to come.

[0 this photograph is shown the bottom view of the Ideal model constructed in our laboratory. Do not try to wire by this picture. Use the schematic, blueprint figure 4 and be certain of electrical accuracy

32 RADIO AGE for March, 1927 Building the Hammarlund­ higher plate voltages and con­ Roberts Set sume a little more A and B cur­ rent than the 20l-A type of tube, (Continu8d from page 9) WORLD R. F. stage and the same proce­ but this is more than repaid in dure should now be following the form of greater volume and with the second R. F. stage. greater freedom from distortion Radio Units The antenna "short" "long" caused by overloading. There­ Save You 50% switch enables the receiver to be fore, it is recommended that type 112 or 171 tubes be used in the "A" Cll1rre'nltr_ _ ~~~~::jif adapted to different types of an­ From· tennae and should be experi­ last audio stage of storage bat­ mented with until the operator tery tube combinations, and the Your becomes familiar with the best 120 type in dry cell tube combi­ Light position of the switch for the dif­ nations. Socket ferent wavelengths. A tube combination which is World In general, the two tuning highly recommended for the av­ dials will read more nearly alike erage installation, is shown be­ "A" POWER UNIT with this switch in the "long" low. It may be used without ~ri\~~~1~a.I.~.,P~~~~i;l ef~;~ the moment YOU throw on position and this position will making any changes in the re­ your set switch. A marvelous Improvement-at $.Z~m~'I' ceiver and can be depended on hal1 the cost of any also afford the greatest selectiv­ uninterrUpted by "I Chi!~~l:~r~~~ry for stability, volume and tone noiseless. Assures rom your set and ity. When throwing this switch wider D X range. subject to iD9pe(l­ from one position to another it quality. tiOD on receipt 01 pr O. D. if you wish. will be necessary to slightly read­ UX201-A or CX301-A in sock­ Built for Long Life just the first tuning dial. ets Nos. 1, 2, 3 and 4. UX112 or CX312 in socket No.5. 6 volt ,iifiiiNII Clearest Batteries and Tubes storage "A" battery. 3.45 volt ':I Truest"B" OR the operation of the re­ "B" batteries. 2 4Y2 volt "c" PoW'er with F batteries. . ' World Radio ceiver the batteries and am­ Storage perites required depend on the To secure in full the advan­ type of tube used. It may be tages of the 171 type of tube, 4 "B" Batteries ~: ~::: sturdy construction. SaUd RulJ7Jer Cast protection. Re-­ noted that the new detector tube 45 volt "B" batteries should be charged for almost nothing. Endorsed and listed as i~~~~asfa~~:~~!O~:a~ 1~~:' i~~' :t~~O ~:ou~o~a~~~ UX-200-A or CX-300-A may be used, and a 40 volt "c" battery Authorities. used in any of the combinations should be connected to the "c" Send No Money ~~t~~a~:muS~i':;~~~~Y of storage battery tubes which Bat-1 (2nd audio) binding post. ~[~~r IS5r%cd'~::rit 1f;f~~1i ~ig- ~d~bJect to cnmlna. are listed herein. It is recom­ With these voltages the plate cur­ Extra Ofter: 4 Batteries In series (96 Volts) $10.50. mended that this type of tube be rent drawn under normal condi­ RadioStorage"A" used if great sensitivity is de­ tions is 18 or 20 milliamperes, Battery-6 Volt Unequaled battery valuel 25 sirable or if reception over ex­ which is too much to safely pass ampere capacity. ldeal lor Trickle Chanter. Solid Rub­ treme distances is an obj ect of through the windings of the av­ ber Case. ShipDOO C. O. D. sublect to ins'Dcctlon. for only special importance. No change erage loud speaker. 55.0n.Send to-day, 5 00 in either battery voltages or am­ b:tsbdl\~w~n~J~~ $ This difficulty can be easily on any World - perites is required. overcome by connecting a choke UnJt. Although either dry cell or WORLD BATTERY COMPANY coil (such as .used in B eliminator 1::J:I, So. Wabash Avenue storage battery tubes will prove filters) directly across the ter­ Dept. 81 Chicago, 111lnoil entirely satisfactory, it should be minals of the loud speaker jack. Set your radio dials at £88.!J mCrer3 fOT the World Storage B attery StaHon W S B C. noted that in general, storage As the resistance of the average VarWu-New Talent-A/wall! Inltre~r~nf1. battery tubes are more satisfac­ loud speaker windings is consid­ G.1iI If;" tory than the dry cell type and erably higher than the direct cur­ should therefore be used where rent resistance of such a choke, possible. most of the 18 or 20 milliamperes The new power tubes which of plate current will pass through have recently become so popular the choke coil and so prevent the well deserve their popularity. burning out of the speaker wind­ For maximum operating effi­ ings. At the same time the al­ ciency they call for somewhat ternating current impedence of the choke is so high that prac­ tically all of the voice currents SUBSCRIBE will go through the loud speaker and no loss of volume will be no­ NOW! ticed. Keep abreast of the times If the method suggested here­ from Radio, Scientific and with is used the choke coil may the choke through the space be­ Mechanical Standpoints. be placed in the rear portion of tween the front and rear shields, $2.50 a Year the left side of the cabinet, two and then soldered to the termi­ wires run from the terminals of nals of the jack. RADIO AGE for March, 192i 33

T~niriab~~:: ::~~~d,:~er I~i~ ~i~~:~sw~:e~~~~~::rs~ch~~e:r;~~O~~~~'!9A~~ :~~ebcco~~~~o':t :~t~A~ion l~Eei;'Do~=:o~'rhl~ ~: ~~~~~w~i~~~:t~~ 1~~c~ r:!~:b~~r~~ but pUblishes the letters and drawings merely 83 a means of permittina the faos to know what the other fellow is doing and thinkina.

OT long ago one of our from the grid end and carried been plotted as the ordinate of N readers, Gilbert D. Dust, over and looped over the top of the curves at this point. As the R. R. 6, Dallas, Texas, the regenerative coil, L5. Prob­ signal frequency is altered sent us a circuit arrangement ably the link circuit permits a (leaving the receiving set un­ which he has found very satis­ semi-regenerative condition in changed) the corresponding factory and which in the orig­ the first RF tube. At any rate field strength to produce the inal form of submission ap­ it is interesting and what's more same standard signal in the loud peared to be a very complicated the log which Mr. Dust fur­ speaker are plotted. circuit. However, a little analy­ nished us is both lengthy and As will be seen, the single­ sis finally evolved the diagram indicative of considerable skill circuit receiver requires but which follows: in DX hunting. little increase in the field ELATIVE selectivity of the strength of an undesired signal, R different types of sets in as much as 50 kc. removed from use is very aptly illustrated in the original frequency, to cause the accompanying diagram the loudspeaker to reproduce it which is excerpted from a re­ with standard signal strength. cent article on the progress dur­ The two-circuit receiver, on the ing 1926 of radio receiving sets other hand, requires a consider­ As will be seen this is one written by Dr. Alfred N. Gold­ ably greater field strength of stage of radio followed by a re­ smith. an interfering signal 50 kc. off generative detector and one the desired frequency to pro­ stage of audio (though in Mr. Super- Hetorodyne V(2 5tag'5 1.F. duce an equal disturbance. Dust's sketch two stages of and 1 RF. 1- 'Vhen the selectivity curve audio were shown). The link for the three-circuit receiver is circuit shown in this diagram is examined, it will be seen that interesting and might be dupli­ signals as much as 50 kilocycles cated by experimenters for removed from the desired fre­ their own information and satis­ quency will be practically ex­ ~hr.' Circuit5 faction. The constants for the cluded unless their intensity is set· are simple: Ll is the pri­ \ \ / extremely high. This is true in mary coil, consisting of about even greater measure for a 10 turns of wire; L2 is about 35 super-heterodyne receiver with to 40 turns, depending on the one stage of tuned radio fre­ variable used; L3 is the primary ~Two CircUits quency and two stages of inter­ of the RF coupler and has 10 "- mediate frequency tuning. Un­ turns while the secondary, L4, \ der present broadcasting condi- has about 35 to 40 turns; L5 is \ II the regenerative coil of about / Cruel Treatment 25 turns. All coils except the One Clfcuit- regenerative coil, are wound on a 3% inch tUbing with No. 20 DCC wire; the regenerative coil 620 1040 600 680 700 720 is wound on a 2% inch tube Frequenc~ K~C. with No. 24 DCC wire. If you In the diagram it is assumed already have an antenna coil the receiver in each case is tuned and a three circuit tuner you to a frequency of 660 kilocycles can hook them into this scheme. (455 meters) . The signal field The link circuit is but a piece of strength required to produce a No. 18 DCC wire looped around standard signal of comfortable .. An' what's more, if I catch you fight­ ing again I'll make you listen in to the the secondary coil four turns intensity in the loudspeaker has bedtime stories every night on the radiol" 34 RADIO AG E for March . 1927 tions. the ideal curve would be F REQUENTLY we have been Static and Statistics a flat-bottom curve with verti­ asked by readers to give (Continued from page 18) cal sides, the width of the bot­ them data on the construction of tom being 10 kilocycles (and intermediate transformers. This what his geographical location, extending from 655 to 665 kilo­ is a subject that is rather touchy who hasn't at some time in his cycles in the case under consid­ with us since we have found as a career heard KDKA. In our eration). In all the preceding general rule that satisfaction is own early days it seemed that curves, receivers having high not obtained by the reader when the first week the triumphant efficiency radio frequency tun­ making his own intermediates cry was, "I've got Pittsburgh," ing stages, electrically separat­ and the failure on his part is and the second week, "I can't ed from each other by one-way reflected back upon the staff of get anything ' but Pittsburgh." amplifiers, have been assumed. the magazine. So as a conse­ True, at that time, due to its It is clear from the preceding quence we do not recommend that reputation as our most exasper­ that the trend of receiver de­ readers make their own interme­ ating fader, no one in our vicin­ sign, based on present-day se­ diate coils. So many factors can ity ever thought of receiving all lectivity requirements, has set enter into the makeup of these off a program from KDKA, but strongly toward multi-tuning­ units that if a well equipped in this era of tremendous power, stage amplification (at radio laboratory has a hard time in and receivers which amaze us by their performance, the fad­ frequencies and intermediate keeping accurate matching of in­ frequencies) . ductance values, what chance has ing is reduced to a minimum, ------the poor home constructor with and it is now possible to spend OSEPH WEIGHTMAN' of limited apparatus to manufac­ an evening with the Pittsburgh J Middletown, Ind., makes a ture what must of necessity be station with as good reception simple cone speaker by means of a precision piece of apparatus. as any other equally distant soldering a lug to the center of If members of the staff would not broadcaster. At times, in fact, a common headphone unit, and care to tackle the construction of they register with such volume attaching it to a cone of parch­ intermediates then we feel we that it is either a case of turning ment paper. The housing may would be derelict in our duty if them out or getting out of the be any form, the sketch below we intimated that readers might house, and if there is anyone in showing the kind preferred by be successful in making their South Africa who hasn't heard Mr. Weightman. own. It might be perfectly well the Westinghouse Band, when for a man to make his own mis­ the engineers are trying to get sion rocker, or even a davenport, it there, he would do well to but few individuals would be suc­ check up on his set. cessful in making their own One is constantly running alarm clock or watch. across some interesting experi­ ment when tuning in on this sta­ E N SINEFSKY, Box 73, tion which would relieve the AROLD E. TAYLOR, 1365 B Rothschild, Wis., is one of monotony, if such a thing could H Cass Ave., Detroit, Mich., the first of our readers to report exist where such a versatility of writes to inform us of his results by letter excellent results with broadcasts is going on from the with the Clough 7 tube super pub­ the World's Record super 8 which various studios from morning lished in the January issue of was published in abbreviated till night. And the many edu­ this magazine. He tuned in suc­ form in the November, 1926, is­ cational and informative pro­ cessively KPO and KFI and also sue, and elaborated upon in the grams that are continually go­ WHB, while within three miles January, 1927, issue of this mag­ ing on the air are as familiar to of WWJ. He arranged the audio azine. the average listener as the mur­ end so that the out put of the ky condition of the atmosphere first stage of audio led to the in­ surrounding KDKA's antennae. put stage of a W estern Electric Likes Science One notes a painstaking thor­ 6025-B power amplifier. He also oughness in everything they do. found that from an analysis of MELLON ENGINEERING CO. For instance when Pittsburgh Pottstown, Pa. gives football scores it isn't the the oscillator readings his long Jan. 26. 1927 wave transformers w ere peaked Radio A ge. Inc .. r esults of a meagre dozen or at approximately 44 kilocycles. 500 N . D earborn St., more major games you hear­ Chicago, Illinois (The manufacturer p ea ked Gentlemen: it's a sporting lexicon of every these transformers at 55 kilo­ I wish to tell you that I like the new contest taking place on Ameri­ sections of your magazine. "Keep· can soil that day. And so de­ cycles.) Perhaps a differ ence ing Step w ith Science" and "Every­ of tube capacities would affect day" Mechanics", very much. As a pendable are the news broad­ the frequency shift ; also the whole I think your magazine is one casts from the Pittsburgh Post of the best on the subject of radio. proximity of the intermediates However. I'd like to Seemore articles studio that when something of to other metallic objects. Other like "How a Variable Condenser Af­ importance breaks, it is a com­ fects y our Set Tuning" by Kirk B. readers have been playing with Morcross. mon thing to h ear, " Well, we'll the Clough 7 tube super and r e­ Y our faithful Booster, wait and get it from Pitts­ port extremely good results. (Signed) Ralph Mello n burgh." RADIO AGE for March, 1927 3S Our oldest friends among KDKA's standard features are the aforesaid Westinghouse Band and Victor Saudeck's Lit­ tle Symphony Orchestra, the latter one of those sterling radio organizations that is always to be depended upon for sound presentations of s tan dar d I works. In the days before the large symphony orchestras were put on the air we were in­ debted to this group for some of our most precious half-hours of musical enjoyment, and they still preserve their high stan­ dard. Improve Your B .. Eliminator In addition to its sustaining programs, KDKA presents a with Allen.. Bradley Resistors number of commercial features, one which has interested us be­ HEN you build a B-Eliminator, be sure ing the Teaberry Hour, and in W that your kit contains Bradleyohm-E addition has its own combina­ tion of hook-ups, though wheth­ for plate voltage control and Bradleyunit-A er this claim is to be continued for the fixed resistors. Then you will be under its apparent arrangement with the National Broadcasting assured of perfect plate voltage control. Company is not entirely clear at Q the present time. But whatever develops in this B~·A B~·E rapidly moving industry, one is PERFECT FIXED nESISTOR PERFECT VAlUABLE nESlSTon confident that the pioneer sta­ This solid, molded fi xed resistor T his oversize variable resistor is tion will go steadily on furnish­ has no glass or hermetic sealing in used as stan dard equipmen t for ing us with dependable enter­ its construction. It is a solid unit, accurate plate voltage control by tainment as it did back in those molded and heat-treated under leading B-Eliminator manufactur­ high pressure, that is e rs. The primitive days when its au­ not affected by tem- scien ti fi­ dience was listening painfully perature, moisture cally treat.. through uncomfortable head­ and age. T he end eddiscsin sets instead of taking its ease caps are silver-plated, Bradley- ~~=-"'~I'Ifb before elaborate mahogany and can be soldered 0 h m - Eo ~~~~~~~ cabinets from which rolls music without affecting the provid-' in tremendous volume. And one accuracy of the Brad- stepless, notes with much satisfaction ley unit. By all means, use Brad- noiseless, plate voltage con trol, and that no matter how many pi­ leyunit-A when you n eed a fi xed the setting will be maintained in­ rates perch on the 309 meter resistor in your radio hookup. I'l definitely. Ask for Bradleyohm-E. wave, the Westinghouse station apparently just increases its Always insist that Bradleyoh m-E and Bradleyunit-A are power and comes r oaring included with your B-Eliminator kit. You then will be assured of perfect voltage con trol. through as though it were alone on the air. A LLE N- BRA D L E Y COMPANY 289 G reenfield Ave. Milwaukee. Wis. Openshaw Now With Pilot ARTIN OPENSHAW, of M Amperite fame, has re­ signed from the Radiall Com­ Write fo r pany to accept the post as Gen­ eral Sales Manager of Pilot Folder Electric Manufacturing Com- I Giving Seven pany, Inc., Brooklyn, New York. B-Eliminator r-----______~ I Hookups. Be Sure To Order YOUR APRIL COPY OF RADIO AGE NOW Startling Developments in Receivers Coming :Use M-en-S~ Perfect Radio Devices: 36 RADIO AGE for March, 1927 A Loop and Four Tubes ometer might be employed. It manship is essential to success. (Continued from page 6) would be connected to the anten­ A one-tube set may work after a na and the ground wire, and the fashion even if it is thrown to­ dragging in things. The builder end next to the antenna would be gether, but when three stages of must be as careful about his an-- connected with the grid of the radio-frequency are employed, gles as a Chinese architect. The first amplifier tube. every connection must be made Chinaman builds his house with- In order to secure satisfactory with care so that it will be non­ out any regard to the line of the results with a loud speaker, it microphonic. The tubes must be street because a certain position probably would be necessary to cushioned ·so that slight jars will of the house will make it hard add two stages of audio-fre­ not set the bells a-ringing. Wires for the evil spirits. to come in. quency, with one of the new must be as short as possible and Take a tip from the Chinaman power tubes in the last stage. must be placed at angles that will or the· goblins will get you. R a d i o-frequency amplification minimize inductive effects and Parallel wires have an inductive builds up the weak signals to the effects of capacity. Panels must effect upon each other when the point where they can pass the be of excellent insulating quality. current is flowing. To reduce in- detector, but it does not increase Necessary marks on panel and duction to the minimum, wires the volume of sound as audio- baseboard must be scratched, not should be at right angles. frequency amplification does. made with a pencil. A pencil Shielding often is used by ama- This is the set to build when mark makes a good grid leak but teur and professional set build- the family declares itself to be it can do a lot of damage when ers. The shields are metal plates sick of radio loud speakers, or it connects parts that should not or boxes and they are grounded when the family monopolizes the have a conductive pathway be­ so that any roving field of en- household receiver and prevent tween them. ergy that is seeking a playmate dad or the oldest son from hear­ An extra ground wire may re­ may be intercepted and precipi- ing what they crave for. With duce interference. Four miles tated to earth. the phones on and his favorite from America's strongest trans­ The diagram shows no tuning station tuned in, the constructor mitting station an experimenter coils, which proves that not all can let the rest of the world go ran out a wire from his six-stage manufacturers and dealers put by. radio-frequency amplifier and into a diagram everything that The diagram lends itself read­ laid it on the lawn. After that they have for sale. The variable ily to the construction of a port­ he was able to hear stations that condenser shunted across the able set. In the early days of formerly were drowned out by in­ loop takes care of the tuning. It broadcasting a Washington in­ terfering waves from the power­ is placed in the antenna or ventor built a set in a suitcase ful station. These were so ground lead when the loop is dis- and it made a hit. With a col­ strong that at times they made carded. A 50-turn coil or a vari- lapsible loop, or one built in the the loud speaker diaphragm cover of the case, such a receiver throw a stream of air that would can be carried easily in an auto­ blowout a match, while the mobile, train or steamship. It speaker bellowed like a factory might be very valuable as a whistle. means of keeping in touch with Four tubes provide an oppor­ the stock market or produce ex­ tunity for endless experiments change. Trucking and taxi con­ and valuable discoveries may be cerns have used such outfits for made. Resistance or capacita­ the purpose of communicating tive coupling may be used in orders to drivers, saving the time place of transformer coupling. and mileage required for visiting Different types of tubes may be TENNA banishes or calling up a central office. They were successful, so far as tested in all sorts of combina­ Uses"'" Fillered Ground Waves. tions. A four-tube set should be STATIC a nd all air noises are one-way communication could be the broadcast and grounded by able to bring in the European befo re the broadcast reaches the satisfactory, but it is impractical distance and clarity of your set broadcast stations when the radio Nothing Else Like I t. ~O\ j~s~ ~ in these days of crowded airlanes Consists of· ,.,;ire differently in- to equip trucks and cabs with weather is good. sulated and jacket and contain- ~~:e a~~iird~ 'N;: d~~: ~~~ i~ ~ transmitters to use in acknowl- Constructors who enjoy the else in the edging receipt of orders, and building process more than quick FREE TRIAL OFFER! ~V~~ 't~ drivers are as expert in using results can design a four-tube set ~gs~n~~B:l~ ~;~ 1~:. ~I~~ b~ f~~~r nsTl'Pl co~~do~~ aenal ~l~~~o~; alibis as in using radio. from the bottom up. Others will FREE TRIAL OFFER (:,;.:planation of SUBANTENNA. W r I It is hardly necessary to tell prefer to purchase a kit with dia­ CLOVERLEAF MANUF ACTURINC CO •• 2716.W Canal St.. Chicago. the amateur who has worked his grams and templates. Complete way up to a four-tube set that kits can be purchased from many the selection of parts is highly manufacturers and dealers, with ..NEW YEAR· NEW IDEA" . important. The best are the panels all drilled and everything ... ~~:f~I!~~:f~J~:~:~~i~~~:~1~~~ .. cheapest in the long run or in the included except what the packer ~;r~!ttc5~~E~T~:!~C!£.~i~t~m e]' , short run either. Good work- forgot to put in. Please Mention Radio A ge Wh en Writing to Advertisers. RADIO AGE for March. 1927 37

DEPENDABLE RADIO EQUIPMENT TRANSMITTING APPARATUS A Complete Stock at "CHIRAD" N addition to our regular I broadcast apparatus we carry a very good stock of tranafonn­ ers, chokes, grid leaks, high test condensers, etc., for transmit;... ting purposes. New Catalog Now Ready Dealers and set builders, write for our new catalog and special discounts. Please address us on your business letterhead. !he CHICAGO RADIO APPARATUS COMPANY Fullest Value 415 South Dearborn St., Chicago Above is shown the new in Radio CHIRAD- RADIO- CHIRAD Timmons Concert grand cone - plus the joy of speaker, which instead of being building it yourself an exact oval. is an elliptical cone, having its driving mechanism ONDERFUL as the Ham­ located at the lower focal point W marlund - Roberts Receiver B~ was in 1926, whenover70,OOOwere THE PERFECT POTENTIOMETER of the ellipse. Offsetting the driving unit, it has been deter­ built at home with uniform su ccess, Uses graphite disc resistors which are this year finds the New Hi-Q* Set noiseless and not mined by the Timmons Radio in corpora ting many features which affected byatmos­ Products Co., results in securing pheric conditions. make it even finer value than ever Metalpartsaxe nickel a much greater surface for actu­ before I plated. One hole ation with a limited physical di­ mounting. Finish One interesting advance is com­ and knob match mension of the cone itself. Re­ plete shielding which prevents Bradleystat. Made in cent tests by the staff of RADIO coupling between stages and elim­ 200 and 400 ohm AGE have shown it to be equal to, inates oscilla tion. Anotheris Auto­ if not better than, OUr laboratory matic Variable Coupling-a new criterion. feature which gives maximum and equal amplifi cation over the en­ tire tuning range. Its circuit is a marvel of efficiency and all parts are matched. ~lvotSllii~~~dli!Y k~fe~!~s~t'tCf- TIVITY which are a distinct radio achieveR ment. Anyone can build the New Hi-Q* Set at home and save money. Follow simple instructions in the "How to Build" book and in a few hours have a radio equal to 8150 to $200 factory-made units of similar efficiency. Parts Complete $6305 (Less cabinet) - Protect Oil Fields From Lightning Get a COllY from your dealer to­ Protection of oil fields from lightning is day or send 25 believed by western oil men to be assured cents direct. through the scientific researches of John Milton Gage and his associate, Dr. Alfred Walter Simon, of Los Angeles. By means of wire devices encircling the oil tanks, the inventors hope to ward off the shafts of lightning and save millions of dollars for the oil companies of this country. Gage is the inventor of the apparatus. Netting above the pool of oil built into *Higb ratio of reacta.nce to resista.nce. High the experimenters' laboratory at Los ratio-Great selectivity-Loud Signals. Angeles represents thunder clouds. John Milton Gage (rlght), points at "protection HAMMARLUND-ROBERTS, Inc. wires" which in the laboratory experiR 1182-D Broadway. N ew York City ments fend off the shafts of lightning ...... S"" 8. . from above Illi~ciiiii;;iiriiiciiiii;;i;ii;i§~~~"ffi~~ I Mention Radio Age When Writing to Advertisers. 38 RADIO AGE/or March, 1927 An Index t~~;:l Radio Hookups!

ow long have you postponed making that favorite hookup of yours because you H couldn't find reliable and clear diagrruns7 We have laid aside a limited number of back issues of RADIO AGE for your use, Below are listed hookups and diagrruns to be found in them, Select the ones you want and enclose 30 cents in strunps for each one desired,

January, 1925 -Power Supply Device-Blueprint Feature. -A Six-Tube Super-Het. -Finishing YOW' Radio Cabinet. -An Efficient Portable Set. February, 1926 -A Tuned Plate Regenerator. -February Radio Age Model Set. -Making So Station-Finder. -Plug-in Coil Receiver. -Universal Testboard-Blueprint. Fe~~~~9a~cuit Regenerator. -Eliminating Audio Distortion. -A R~l Low LOBS Set. -Blueprints of a 3-tube Reflex. March,1926 -Improving the Browning-Drake. March,1925 -Rheostatless Tubes in a Set. -A 6-Tube R. F. Receiver. -Which Type Intermediate? -How to Wind Low Loss Coils. -How to Make a Wavemeter-Blueprint. -A Short Wave Receiver. -Blueprints of a Two-Tube mtra Audion and a April,1926 Regenerative Reflex. -Shielding Your Receiver. -Home Testing Your Tubes. April,1925 -Balanced Capacity Receiver. -A 3-Tube Portable Set. -liB" Voltage from the A. C. Socket. -Several Seta on One Antenna. -An Amplifier for the 3-Circuit Tuner. May, 1926 -Blueprints of a Five-Tube Radio Frequency -Short Wave Transmitter-Blueprint. Receiver. -Simplifying Battery Charging. • May, 1925 -List of European Broadcasters. -A "Quiet" Regenerator. -Protecting your Inventione. -How to Make a Tube-Teater. June, 1926 -A Unique Super-Het and an Improved Rein- -Antenna Design. artz, -Simple Crystal Set. -A Six-Tube Portable Receiver Illustrated with -Improving the Nelltrodyne. Blueprin ta. -Golden Rule Receiver-Blueprinta. June, 1925 July, 1926 -Reducing Static Disturbances. -Compact Portable Super. -A Seven.Tube Super.Heterodyne. -Short Wave Receiver. -Browning-Drake Receiver. -Shielded Golden Rule Set. -Overcoming Oscillations in the Roberts Re- ceiver. August, 1926 July, 1925 -Receiver, Transmitter and Wavemeter. -Learning Tube Characteristics. -Beginners 200 mile Crystal Set. -How Much Coupling? -History of Amateurs. • -Blueprint!!! of Conventional Radio. -Changing to Single Control. -Symbola and Crystal Detector Circuit. September, 1926 . August, 1925--SOc per copy -How to Make a Grid Meter Driver -How to Attain Smooth Tuning. -Short WaVe Wavemeter -Alternating Current Tubes. -Power Amplifier for Quality (Blueprint) -Deciding on a Portable Super. October, 1926 -And a big 6O-page blueprint section. -Crystal Control Low Power Transmitter (Blue- September, 1925 print) -Thirty-one ways to prevent self-oscillation. -Raytheon Design for ABC Elimination -Tuning efficiency with two controls. -What Type Loud Speaker to Use -Ideal Audio AmplifierCi rcuits. -Nine Tube Super Brings Back Fruth -Blueprint section. Novem.ber, 1926 October, 1925 -Blueprints of the Henry-Lyford. -Auto-Transformer Coupling. -World's Record Super With Large Tubes. ! -Some Facts about Quality. -How to U8e a Power Tube in Your Set. =~u!:~~v~~ ~~c';ri~iru~d~i~gle and Dual -Illuminated Controls on 4 Tube Receiver. ControlEl. December, 1926 November, 1925 -Starting: Radio with Crystal Set. =1nGEHtct~~~h~:~~a~!·Transmitter. =~~'!'~~f ~~~\i~~ ~:i:=;d. 1 -Bllleprints--Adding R. F. Stages. January, 1927 a December,1925 -Full Data on Worlds Record Set. J! =Ld: fge FM~~l ~:ei~:~on. =glo~gr~u~:eg::i·gn. 0 -Inductive Gang-Control Receiver. February, 1927 -Tuning with Chart Curves. -Bmldmg the Hammarlund-Roberts I January, 1926 -Making a 36 Inch Cone Speaker -RadIO Age January Model Set. -Data on the B-T Power Six.. I -A Four-Tube Toroid Set. - Brownmg Drake Power Operated 3~adio Age, Inc., 500-510 N. Dearborn St., Chicago i

I~~~~~~~~~~~~~~~~~~~~~~~~~~~W~~~~~q~qA~W$¢~$q$~ RADIO AGE for March, 1927 39 I. f~~¥o~~~ CHARGER Connects Ri2ht~ You.- Litht

Arthur (HBugs") Baer. newspaper and vaudeville humorist, who recently ap­ Socket peared in Eveready Hour program . .. Bugs" had his own private idea of how a radio announcer should disport himself between musical numbers of a program, so he was asked by Eveready Hour pro­ gram directors to prepare his announce- NO ments as well as deliver them. 11..0 -~ ' Good News for Radio Listeners RADIO legislation of an ade­ it BATTERY quate nature now seems as­ sured with the agreement by POLK'S REFERENCE BOOK , congressional conference com- TROUBLEJ FOR DIRECT MAIL ADVERTISERS mittees embodying the follow­ Sold by Authorized Freshman Show, how 10 lnCf(!ase your bus!neu br ing provisions: ~:r, ~e ,r:alD~~~~a:!~d:~~'~~~O ~~:. Dealers Only wbtn and bow min, pl'OSperl, 700 bate. A commission of five mem­ Write for new literature Onr 8,000 lin.. of bllllinul covered. Write tor your FREE ooP'. bers appointed by the President CHAS. FRESHMAN CO., INC. R. L POLK" Mich• for a term of six years each. Freshman Bldg .• New York • 11 POLK Bnnehu The commission will have orig­ inal jursdiction in granting, re­ newing and revoking all station licenses for a period of one AMAZING year. Thereafter the Secretary INVENTION I of Commerce shall be the origi­ FOR ANY RADIO Why confine 'your radiO pro­ nating source, and only matters jCrll lt1s to a reI" l o~a l ~ I ; ltions when Ihe ex p l' n s l ~ e roncerts. of a controversial nature ap­ dance mmle Imd. l P.et ure~ n( To the Man witb an Idea hundreds or bi!:: eitlu nre rf't\Uy pealed either by the Secretary IOf lOu , Connecl this nI ~- I offer a comprehensive. experi­ 'rANeE GJo7rTER to ~·O UI fadio. tun ~ ;J.cw rdil1g to 111- enced efficient service for his or any party aggrieved will be strucl1cns and presto--note prompt. legal protection and tbe the distant Dro~alll S roll in! development of his proposition. handled by the commission. The Satisfaction Guaranteed Send sketcb of model and de­ Y~ur money instllntly re­ ecriptlon. for advice as to cost, Secretary of Commerce is given funded If ~'ou are nol .satis­ fied. 'fhe ar ticle on search through prior United States all administrative functions and tun lnl\'. furnished patents, etc. Preliminary advice rladJy furnished without charge. full control over operators and ~VI~:e r~~or~li ~~~en c,• •". : ,",,'.. ., My experience and familiarity writes: " n :'~ UIl 5 ,;,::,:_;,-"::,, -.,,:, .:,,,,':0·' various arts Cuts thru locnb with frequently en­ their licenses. The act is to I'alos, 111. . able me to accurately advise dI­ rriends. J ents as to probable patentability take effect upon passage and beforl!! they 1'0 to any expense. signature by the President. All Bookl,t of ttaluabfe informlltion lind (orm for prop~rtll disclosing you.? commISSIOnerS must d i ve s t idea free 01'l requ.est. Writ~ today themselves of any radio inter­ RICHARD B. OWEN, Palenl Lawyer ests or radio holdings. Broad­ 81 Owen Blda., WasblnatoD. D. C. 41.M Park Row, N. Y. City casters must sign a waiver of ~ame their right against the govern­ "' (hh" ... ~ s . men.t to use any wavelength. City .... "" State_. Please Mention Radio Age lVhen Writing to Advertisers. .. 0 RADIO AGE for March, 192i Radio Is Used to ll'BATTERY Find Auto Noises HAT does the voice look W like? Of course you have never seen it. But visitors to the General Motors building in De­ troit recently were able to see projected upon a screen the sound waves their voices made. They saw, also, how General Motors has harnessed radio and put it to work to make better au­ tomobiles. It was a demonstra­ Locating a vibrating tuning fork in front tion in popular form of the more of a microphone as shown in this picture, delicate and elaborate apparatus gives the effect shown in the oscillao­ graph pattern shown at the top of the used in the G. M. Research Labo­ smaller photo ratories for finding automobile noises. "telegraphed" from one member to another. There is always the danger that the wrong member

I ' I ,~ • , • i • I • I I I, \ ,I I I I , , I ~ ! 1111 " I, I III II" I • II I • \ I will be accused of making the l . f lrll'lltllllll""''')' ''I''''I'-''''' ''I''f'' noise. It often happens, too, that " 1 ~ "'_ F..... />rf;!te invention. You wBI I bl' delighted with the "olume IUld dIstinctness of your • City...... State.... tion from the radio fans. radio programs. Please Me"tion Radio Age When Writi"" to AdvertiseT8, 42 RADIO AGE for March, 1927

SOMETHING NEW IN RADIO

Y Oll n eed no longer delay your p urchase of Il. high quality re­ ceiving s et. With "New Ide,," you milS now huY &II YOU go 8.Drl d e corate the cabinet to e"p~ss your individu,.Ety. The complete Att­ Cabinet m<>dei maJl he pllrch.."ed much as you would a ~c­ ,;lonal hookeMe. Yau can start with the Rimke eX-fl tuhe tuned radio frequency receiver. purd",,,,ed On I ten_ day trial h ,,-~is. Tilt" maY be used 11$ an ordiIl.lO.ry table hCC. Price S7SJ)O. You m ay then add a port3.hle ca~e. which provides a SP &

Thousands of friends of Jack Nelson will be interested in learning that the famous Next com.". the New studio star is taking a rest from active I~ Art Cahinet .... shown in the illu.s­ duty and that he has severed his connec­ trations. with a full tion with the Mooseheart-Palmer House­ Get of beautiful p anel d e coration ~ . A ll Edgewater Beach Hotel-Herald and panels bein&" feIll()V­ Examiner station, known rather cumber­ fl,hle, you may we RADIO ~~ ~~~~_~it~i~a~ oht.in cahinet Of somely over the air as WEBH and WJJD. radio dealers operating live-wire decorate with pic­ The four-ply radio station was not the tUf<1'S, ta p est ry, stores who want to make the best n" " dll>work, e tc. best background for a man of Jack's The panel decora­ jobber connection in America. tions h eing inter­ ability in any event. Where so many ehangMhle. YOU will interests are combining, perhaps for never tire of thb DEALERS beautiful cabinet. reasons of economy, to present programs, Our eight big warehouses furnish you :557.50. there is likely to be a tendency toward a Each unit sold eep...... with the finest products in radio, And ately - particulnrs • lack of individuality. Jack is nothing we ship fast. I>n reQu'""'t. Your if not individual. He was the pioneer _tisf",etion gunr",n­ WANTED t"ed or money re­ who made WDAP famous five years ago. funded within teD. Write today on your letterhead for big daYl!. Buy from Radio listeners will be glad to have him catalog of nationally advertised lines. a<:ent or order direct back on the air where he can have more from f",ctory. Ask for L 1009

(Con tinued jTom page 15) for as soon as Bill began to make really important belle of Belvidere, and smile inscrutably into the money Isis spen t h er winters in F lorida and her su m­ c amera ~ almost unbelievably scornful of the two gun m ers in Switzerland. with which Looney Luke had him covered! Isis was As Bill stopped at the cashier's desk of the hospital over there no·w, waiting to share in the triumph of to pay his chits he was mildly surprised at the obse­ the final rehearsal. Officers of Apollo Pictures, Inc., quious way in which the cashier handed him the bad were in the eager gallery of spectators. Apollo Pic­ news. Secretly he had beeri worrying lest his adventure tures had hastened Bill through his novitiate, spurred should have made him the butt of ribald or college on by the fact that the only other available actor-rider humor. But there was no lurking smile behind the recently had lost his health by habitually leaving courtesy and deference of the cashier. As Bill and ginger ale out of his rickeys and the starving nation Isis strode along the train platform at the station, was crying for more blood and sand and sage brush. porter after porter bowed as porters bow only to the When all was ready Bill's (all figure straightened t ruly grea t . Once stadeJ on their Journey (he Pullman as if galvanized. His ey e flashed as he took an extra conductor asked Bill if he would not prefer to change hitch in his belt and slapped the dust out of his cha­ his drawing room to one with a sou thern exposure. parras. Stepping forward in his first major movement " There is something wrong somewhere," mused Bill. of his symphony he placed his right foot upon a grape "Whom do these people think me to be?" fruit which had been lost by a screen-mad little girl Isis looked across the tiny compartment at him, the from Indianola, Ia. The grape fruit emitted a damp dawning of a great idea playing upon her countenance. hiss but it was too late. This trivial mishap so modified lII've got it, Bill," cried Isis. "It's your face.1} Bill's leap that instead of jumping upward at an angle She handed him her mirror and for the first time of 82 degrees he jumped horizontally. since Percival stepped on him Bill looked upon the Percival, the grand old roan of the silver sheet, image of his countenance. It was the face of a master caught Bill on his starboard midriff. The horse grunted of men. The horse's foot had raised his brow and horridly and then, turning abou t and seeing Bill lying widened it. His eye, formerly pleasant, now, under cold upon the synthetic desert sands the faithful old over-slung brows, had a malevolent expression which fellow walked over leisurely and stepped, once, on made him catch his breath. His mouth, once ordi­ Bill's face. narily good, had been kneaded into an expression of Upon departing from Los Angeles Bill Rossom wen t grim determination and aby smal cunning. It was directly from the hospital to the railroad station. He such a mouth that must have been the first to say : was accompanied by Isis Osiris, wh o had nursed him "They shall not pass." His nose, once Greek, was through his convalescence, with the aid of the hospital Roman. doctors and nurses, and who was now to follow him (II see," exulted Bill R ossom, hurling a side the to the world's end, if need be, for she had surrendered ·mirror, III see, I see." her heart and her hope of a career at the same time. Hours later, as the train went around a bend, Bill Nobody in Fortunatus knew the true story of this and Isis caught a glimpse of distant sky scrapers, hun­ chapter in Bill's life, with the exception of Bill and dreds of them, etching a jagged skyline. Isis. Bill never thought it necessary or in good taste "Fortunatus!" whispered BilL " I will play on"that to speak of it and Isis had no opportunity to do so, town like a fiddle ." - r-­ I A KICK IN --fHE FACE transformed Bill Rossom from a third rate moyie actor into a master of men- This startling metamorphosis is but one of the thrilling events in the absorbing serial, "The Froth Estate," by Joseph Balsamo, now r unning in RADIO AGE. A big circulation war between powerful newspaper interests; a gigantic t ussle in which no weapon is barred nor money spared to insure the defeat of th e newcomer in the field. Read the April issue of this magazine for details of a plot undreamt of in the annals of newspaperdoffi. Place your order now with your newsdealer for the April edition ; or better still turn to page 51 where you will find a handy subscription blank. Fill it in now to make sure of your getting each installment of this galvanic narrative, the fi rst of its kind ever published in the world.

500 N. Dearborn St. RAD IO AGE, Inc. Chicago, IlL L 44 RADIO AGEjor March, 1927 Absorption Cireui t Used to Rid Super of Repeats Experimenters May Find Solution of Their Problem in Recent Patent

NE of the most interesting able feature of the super, and With the addition of the absorp­ O c i r cui t arrangements, the method outlined by Mr. tion circuit which is tuned to from an experimental Diehl is advanced to eliminate 1050 kilocycles, resistance will standpoint, is disclosed in the one of the repeat points, by the be introduced into the oscillator recent application granted by following improvement: circuit at 1050 kilocycles and the patent office to William F. A third circuit is added to the prevent oscillation at that fre­ Diehl, of Jamaica, N. Y., on a conventional super, consisting quency, leaving, however, the method of coupling an absorp­ of L 1 and L 2 in the schematic 950 kilocycle oscillation re­ tion circuit to the oscillator of a on this page. L 1 is the usual quired to mix with the incoming superheterodyne to eliminate pickup winding, while L 2 is a signal. Or the absorption cir­ repeat points in its operation. tuned absorption circuit. This cuit may be set for 950 kilo­ Applicatlon was filed on De­ absorption circuit is coupled cycles so that with this setting cember 19, 1924, and granted electrically to the oscillator cir­ resistance is increased at 950 on November 30, 1926. The de­ cuit, and mechanically coupled kilocycles in the oscillator, stop­ scription given herein is taken to the loop circuit through a ping its oscillation at that value, from the claims in the Diehl common insulating shaft for the and letting the 1050 kilocycle papers. rotors of the capacities C and oscillation go throughunim­ In the conventional super­ C2. paired. The values of inter­ heterodyne the 0 sci I I a tor Assuming a received signal of mediate frequency are merely creates a locally generated cur­ 1000 kilocycles, an intermediate illustrative. The system should rent, which when combined frequency of 50 kilocycles; the work with any of the commer­ with the signal current (incom­ conventional super would re­ cially made long wave trans­ ing from the loop or antenna) ceive with an oscillator setting formers. The degree of ef­ gives in the plate circuit of the of either 950 or 1050 kilocycles. ficiency with which the system first tube, a current of inter­ mediate frequency. This plate circuit is tuned to the inter­ mediate frequency by the capa­ INPUTTO SOKe. city C3 across the primary of the intermediate -transformer, INTERMEDIATES, e~ and passes through amplifica­ LOOP tion into the intermediate stages DETECTOR. where it is finally detected and AND AUDIO amplified by audio transform­ ers. The frequency of the cur­ COMMON I rent supplied to the intermedi­ INSULATED SHAFT ate amplifier is equal to the dif­ ference in frequency of the signal current coming into the loop and that current generated by the oscillator. From this it will be seen that the same value of intermediate frequency will be obtained for two values of frequency in the oscillator cir­ cuit. This circuit can be set to generate either a higher or lower frequency than that of the incoming signal, resulting in ~ ______-+______~~-+~- B~ the appearance of a given sta­ Interesting scheme d1sclosed by William F. Diehl for coupling an absorption tion's signals in two positions on circuit to the oscillator in order to swallow one of the the oscillator dial. This has undesired repeat points in a super been considered an objection- RADIO AGE for March, 1927 45 works will depend a great deal electrically activated eggs car­ on the care with which the ried on growth as far as the absorption circuit L2 is made. earlier stages of larval life. The portion of the absorption During the past f ew years, circuit which is spanned by unfertilized egg s of many C2 should be approximately species of animals h ave been

KGFB A. G. DunkeL ___ .. _...... _.. _.... _...... _... lowa City, la. 224 KWTC J. vV. Hancock ___ .. _...... _.. _ .. _ ...... _.Santa Asa, Calif. 261 KGFF Earl E. Hampshire. ______.Alva, Okla. 205 KWUC \Vestern Union Coilege. ______Le Mars, Iowa 252 KGO General Electric Co ______Dakland, Calif. 361 KWWG City of Brownsville.. ______Brownsville, Texas 278 KGRC Gene Roth & Co. ______.San Antonio, Texas 315 KXL KXL Broadcasters______Portland, Ore. 400 KGRS Gish Radio Servioe.. ______..A.marillo, Tex. 234 KXRO Brott Laboratories. ______.5eattle, Wash. 240 KGTT Glad Tidings Tabernacle, Inc ______San Francisco, Cal. 207 KYA Pacific Broadcasting Corp ______.5an Francisco, Calif. 400 KGU Marion A. Mulrony ______Honolulut Hawaii 270 KYW Westinghouse Electric & Mfg. Co ______Chicago,Ill. 535 KGW Oregonian Publishing Co.______Portland, Ore. 492 KZl\I Preston D. Allen ______Oakland, Claif. 240 KGY St. l\!lartins College.. ______... Lacey, vVash. 278 WAAD Ohio Mechanical Institute. ______Cincinnati, Ohio 258 KHJ Times-lVIirror Co. ______. __ . _____ ~---_--Los Angeles, Calif. 405 W AAF Chicago Daily Drovers J ournaL ______Chicago, Ill. 278 KHQ Louis \VasmeL ______5pokane, Wash. 395 KICK Atlantic Automobile Co_. ______. __ ._. ______...A.nita, Ia_ 273 ~ ~~ ~~~~B~~:ee:_~~~_~=~~=~~=~~=~~~-====_~~i~;~~;~~~;: ~: I~ ;:~ KJBS J. Brunton & Sons Co ______.5an Francisco, Calif. 220 W AA W Omaha Grain Exchange.. ______Omaha, N ebr _ 384 KJR Northwest Radio Service Co ______5eattle, vVash. 384 WABB Harrisburg Radio CO ______Harrisburg, Pa_ 204 KKP City of Seattle, Harbor Dept ______Seattle, Wash. 260 WABC Atlantic Broadcasting Corp ____ L ______New York, N_ Y. 316 KLDS Reorganized Church of J esusChrist, I ndependence,Mo_ 44.1 WABF Markle Broadcasting Corp ______Pringleboro, Pa. 4.11 KLS vVarner Brothers. ______Oakland, Calif. 250 WABI 1st Universalist Church ______Bangor, Me. 24.0 KLX Tribune Publishing Co______'Oakland, Calif. 508 WABO Hickson Electric Coo, Inc ______Rochester, N_ Y. 278 KLZ Reynolds Radio Co______:. ___ Denver, Colo. 384. WABR Scott High SchooL_.. _.. _...... -.-... - .. - .. -... Toledo, Ohio 263 KiVIA 1-1ay Seed & Nursery______Shenandoah, Iowa 461 WABW College of \Vooster______Wooster, Ohio 207 KMED W.]. Virgin ..... _..... _.. _.. _.. _.. _...... _.. _... Medford, Ore. 250 WABX Henry B. ]oy. ______.. _.. _.. _.. _.. _ ... Mt. Clemens, Mich. 246 KMIC J. R. Fouch ______Inglewood, C alif. 387 WABY John Magaldi, Jr______Philadelphia, Pa. 242 Kl'.tI J Fresno Bee______Fresno, Calif. 234. WABZ Colis Place Baptist Churc:b. ______New Orleans, La. 275 KMMJ M. M_ Johnson Co______Clay Center, Nebr. 229 WADC Allen T. Simmons. ______.Akron, Ohio 258 KMO Love Electric Co______Tacoma, \Vash. 250 WAFD Albert P. ParfeL ______Detrpit, I\:lich. 312 KMOX Voice of St. Louis ______5t. Louis, Mo_ 280 WAGN R. L. Miller. _____ .. _.. _ .. _.. c .. _.. _.. _ ... Royal Oak, Mich. 275 KMTR Echophone Mfg. Co______.:. ______Los A ngeles, Calif. 372 WAGS \\Tillow Garage, Inc.. ______Sommervitle, Mass. 250 KNRC C. B. Juneau______Santa Monica, Calif. 238 WAIT A. H. \Vaite & CO ______Taunton, Mass. 229 KNX Los Angeles Express. ______.Los Angeles, Calif. 337 WAIU American Insurance U nion ______Columbus, Ohio 294 KOA General Electric Co______Denver, Colo. 322 WAMD Raddison Radio Corp______Minneapolis, Minn. 244 KOAC Oregon Agriculture College ______COrvallis, Oreg. 280 WAOK A. H. Andreasen______Ozone Park, N. Y. 24.8 KOB N. Mex. College of Agric. ______State College. N. Mex. 34.9 WAPI Alabama Polytechnic Institute.. ______.Auburn Ala. 461 KOCH Omaha Central High SchooL ______Omaha, Neb. 258 W ARC American Radio & Research ______Medford, Mass_ 261 KOCW Oklahoma College for \VomeIL ______Chickasha, Okla. 252 WARS Amateur Radio Specialty CO ______Brooklyn, N_ Y. 295 KOIL Mona Motor Oil Co ______Council Bluffs, Iowa 306 WASH Baxter Laundry Co ______Grand Rapids, lVlich. 256 KOIN KOI N, Inc. ______Portland, Ore. 319 WATT Edison Elec. lIlum. (Portable)... _.. _.. _... Boston, Mass. 244 KOMO Fisher's Blend Station, Inc. ______Seattle, Wash. 306 WBAA Purdue University______W. Lafayette, Ind. 273 KOWW Frank A_ Moore ______vValla \iValla, Wash. 285 WBAC James Milliken University______Decatur, Ill. 270 KPCB Pacific Coast Biscuit Co. ______Seattle, \;v'ash_ 521 WBAK Pennsylvania State Police. __'- ______Harrisburg, Pa. 275 KPJM Wilburn Radio Service.______.. _.. _.. _..... Prescott, Ariz. 215 WBAL Consolidated Gas & Power CO. ___ .. _... Baltimore, Md. 246 KPO Hale Bros., Inc ______San Francisco, Calif. 428 WBAP Carter Publication, Inc.. ______Ft. Worth, Tex. 476 KPPC Pasadena Presbyterian Church. ______Pasadena, Calif. 229 WBAW Braid Elec. Co. & Waldrum Drug Co__ Nashville, Tenn_ 236 KPRC Houston Printing Co ______Houston, Texas 297 WBAX John H. Stenger, Jr ______Wilkes-Barre, Pa. 256 KPSN StaroN ews. ______Pasadena, Calif _ 316 WBBC P.]. Testan._.... _.. _ .. _ .. _ ...... _.. _.. _ ... Brooklyn, N. Y. 250 KQW First Baptist Church ______San Jose, Calif. 333 WBBL Grace Covenant Presbyterian Church __ Richmond, Va. 229 KQV Doubleday-Hill Electric Co______Pittsburgh, Pa. 275 WBBM Atlass Investment______Chicago, Ill. 226 KRAC Caddo Radio Club ______.5hreveport, La. 220 WBBP Petoskey High SchooL___ .._ ...... Petoskey, Mich. 238 KRE Berkeley Daily Gazette______Berkeley, Calif. 256 WBBR People's Pulpit Assoc ______Rossville, N. Y. 416 KRLD Dallas Radio Laboratorics. ______Dallas, Tex. 357 WBBW Ruffner Junior High SchooL_ .. _... _._ .. _... Norfolk, Va. 222 KROW Oregon Broadcast Co______Portland, Ore. 231 WBBY Washington Light Inf...... _ ...... _.. _ ... Charleston, S. C. 268 KRSC RaJio Sales Corp .... _.. _.. _.. _.. _.. _. . _.. _..... Seattle, Wash. 500 WBBZ C. L. Carrell. __ .. _.. _ .. _.. _.. _..... (Portable), Chicago, Ill. 216 KSAC Kansas State Agricultural College._Manhattan, Kans. 341 WBCN Foster & MacDonneIL______Chicago, Ill_ 266 KSBA "V. G_ Patterson______Shreveport, La. 261 WBES Bliss Electrical SchooL ______Takoma Park, I\:ld. 222 KSD Pulitzer Publishing Co______St. Louis, Mo_ 545 WBET Boston Transcript CO. ______Boston, Mass_ 384 KSEI Broadcasting Association______Pocatello, Idaho 261 WBKN Arthur Faske______Brooklyn, New York 291 KSL Radio Service Corp______Salt Lake City, Utah 300 WBMC Malbrook Co ______Woodside, N. Y. 294. KSMR Santa I\.Jada Valley Railroad. ____ Santa Maria, Calif. 283 WBMH Braun's Music House______Detroit, ]\1ich. 353 KSO Berry Seed Co ______Clarinda, Iowa 405 WBMS G.]. Schowerer. ______.. _.. _ .. _ .. _ ... Nmth Bergen, N.]. 224 KSOO Sioux Falls Bdcst. Ass'n. ______Sioux Falls, S. D. 360 WBNY Baruschrome Corp______New York, N. Y. 322 KTAB Aswciated Broadcasters______'Oakland, Calif. 303 WBOQ Atlantic Bdcst. Corp...... _.. _... Richmond Bin, N. Y. 236 KTAP Robert B. Bridge. ______5an Antonio, T exas 263 WBRC Birmingham Broadcasting Co ______Birmingham, Ala. 24 KTBI Bible Institute______.Los Angeles, Calif. 294. WBRE Baltimore Radio Exchange______Wilkes-Barre, Pa. 231 KTBR M. E. Brown______Portland, Ore. 263 WBRL Booth Radio Laboratories. ______Tilton, N_ H. 420 KTHS New Arlington HoteL __.. _ ...... _.. _... Hot Springs, Ark. 375 WBRS Universal Radio Mfg. Co ...... _ .. _... Brooklyn, N . Y. 39 KTNT N. Baker______Muscatine, Iowa_ 333 WBSO Babson's Statistical Org______\Vellesley Hills, Mass. 24.2 KTUE Uhalt Electric ______Houston, Texas 263 WBT Charlotte Chamber of Commerce ______Charlotte, N. C. 27. KTW First Presbyterian Church ______Seattle, \Vash. 454 WBZ 'Westinghouse Elect. & Mfg. Co. _____ Springfield, Mass. 33 KUJ Puget Sound Broadcasting Co ______Seattle, Wash. 352 WBZA 'vVestirighouse Elect. & Mfg. Co. ______Boston, Mass. 33 KUOA University of Arkansas.. ______Fayetteville, Ark. 300 WCAC Connecticut Agricultural College______Mansfield, Conn. 27 KUOM Vniversity of Montana. ______Missoula, Mont. 244 WCAD St. Lawrence University______Canton, N. Y. 26 KUSD University of South Dakota. ______Vermillion, S. D. 278 WCAE Kaufman & Baer Co ______.. ______Pittsburgh, Pa. 461 KUT University of Texas. ______...A.ustin, Texas 231 WCAJ Nebraska \Vesleyan University___ University Pl., Nebr_ 25 KVI Puget Sound Broadcasting Co ______Tacoma, \¥ash. 342 WCAL St. Olaf College. ___ .... _.. _.. _ .. _ .. _...... Northfield, Minn. 33 KVOO Southwestern ~ale5 Corp______Bristow, Okla_ 375 WCAM City of Camden... _ ...... _.....• _.. _.. _ ...... _... Camden, N.] 33 KVOS L. L. ] ackson ..... _ .. __. . _. . _.. _.. _ .. _ ...... _.. Seattle, Wash. 333 WCAO Monumental Radio Inc.______Baltimore, I\:Jd. 27 KWCR H. F. Parr ______Cedar Rapids, Iowa 296 WCAR Southern Radio Corp______. ______San Antonio, T exas 26 KWG Portable Wireless T elegraph Co ______Stockton, Calif. 248 WCAT School of Mines...... _._ ...... _... Rapid City, S. Dak. 14 KWKC \;\/ilson Duncan Studios. ______Kansas City, Mo. 236 WCAU Universal Broadcasting Co ______Philadelphia, Pa. 27 KWLC Luther College ______Decorah, Im"a 431 WCAX University of Vermont. ______Burlington, Vt. 25 KWSC State College of vVashington ______Pullman, \~rash . 349 WCAZ Carthage College. ______.._ ...... _...... _... Carthage, Ill. 24 RADIO AGE for March, 1927 49 Further Notes on the Worlds Record Super 8 UITE a number of super fans Qhave written in regarding the superheterdyone featured by RADIO AGE on page 18 of the Jan­ uary, 1927, issue. Out of the host of letters received only two readers have failed to get the r e­ sults they expected. Their ques­ tions have since been answered and it is hoped by this time these two gentlemen will have fixed up their set. I Two or three points may be of interest to those who have either built the set, or contemplate do­ ing so. The schematic circuit shown on page 18 is electrically The Lowest Priced correct and should be followed for the wiring. The choke coil shown in the drawing as RFC Quality HB" Eliminator may be eliminated from this set Livermore Falls. Maioe. The mo ment you see the good Ferbend (( B" if desired since using a series Have b~D u sing yo ur Eliminator you understand why during its first two Eliminator for a year IIDd j years of successful service it has made nearly 50,000 weH satistIed with It as feed on the oscillator plate the H gives good results and f riends. " Singular Value" is written all over this is free from any hum, coil is not essential. ELMER A. HIGGS. fi ne instrument. Duluth, M inn. Outstanding Quality, however, is confirmed only For use with batteries (dry or Yo u r Eliminator lin "iren rna wonderful con ­ through proof of lasting good periormance--so we wet) the 22, 67, 90 and 135 volt tinuous sen'lce ror the ask you to r ead t he interesting endorsements repro­ past year. connections are correct. How­ F . A. LOH.'IE R duced here. They are only a few out of thousands­ 81. Loub . ~[o . but actually your best means of verifying the in· ever for use with eliminators Your Elimina t o r is wonderful. I a m rccolll' formation ,.e gi \'e you. having only four taps, the 67 and m endloil it to a ll my Ho'w can we produce a Quality I nst rument at a pat.lents as I tlJlnk It a 90 volt wires may be joined to­ wond"rful va lue. price so spectacular V Because we are pioneer spe· DR. A. C. BURIAN. cialists in the manufacture of " En E liminat ors­ gether and run to the 90 volt tap Columbus. Ohio. You r Eliminator has because every component part is designed, made and !Je en in service for a year assembled under one roof-because Ou r overhead is on the eliminator. The 22 and and I am ver y well satis­ fi ed with it. ma ny times lower. 135 volt wires are all right for Lim C. SPRAGUE. T he Original F erbend (I B II Eliminat or operates San J ose. Callf. either eliminator or batteries, but lIal'e had }'o ur E llwina­ direct from your E lectric Light Socket on 110·120 since most eliminators have only tor for a year ami it hal volt A. C. Lighting Circuit. Deli\'ers up to 100 giVen PW~'C~ " aJ~{~n1:~: Yo lts. Price $12.50. 'I'he electrolytic method co m· the 45, 90 and 135 volt taps some Cle'·ela nd. Ohio, bined with f ull waxc rectification" gh'es results far Aftcr nineteen months provision had to be made for th e of service my F crbcll<1 superior to those obtained by any ot. her method. t;lhninator is stlU a ivlna T he New Ferbend High V oltage Model f or ex ­ 67 volt terminal being supplied. excell ent resutts and has stoo d UP . ali'aiuSl m Udi tremely large sets and all sets using power t ubes. Another point of interest is the hliher prleed out ll ts, Deli vers up to 180 yolts. One Co ntrol adjusts volt· R. ST. llAltllOFF. ages on all taps. P rice $17.50. fact the bias on the intermediate Beaver. P enn. I have been uslnli' yo ur Equal to the Best-at a cost less than half! Sooller Eliminator for a year stages (to which is joined the a u­ 1I0W and have wonderful or later you will purchase a HB" Eliminator, Why resut ts with it. pay morel dio bias) is more or less cr it­ IL L . ,l1cCULLOUGH. Money-Bad, Guuwnlee ical for best r esults. Tune in a dist ant station (or a local with See Your D ealer -or Send Direct Shipment mad e direc t on receipt of price, or C.O.D. volume cut down) and then ad­ if preferred. Use for ] 0 days to convince yourself­ just the bias on the intermediates if ullsatisfactory wri te us within t hat time and pur­ for best quality and volume. The chase pr ice will be refunded. Send Coupon TODAY. FERBEND ELECTRIC COMPANY C battery in the center tap of the 43 1 West Superior Stree t loop may also be shifted until a value is found that delivers best quality and volume. FER-BEND If the loop circuit is too highly regenerative (that is, oscillates "B" ELIMINATOR too freely) the .0005 mfd. fixed FER'BE'lI."D ELECTR1C CO. condenser shown between the 431 W. Superior Sl.. Chicali'o. m. [J Send $1 2. 50 model. plate of the fi rst detector and the [) Send $11. 50 model. Apprm.ted an d ptUsed filament of the same tube, should bv the rigid L abo-ro· [] Scnd at once. Payment enclDs ed. Milkers of tile tory Tes ts of the t wo [l Send C. 0 , D. [] Send Literature. orl::inai and gcnuine be used. If the loop circuit does foremost R adio Lab· P1'afunea i n A merica afiiJi}{ENO not oscillate at all, the .0005 mfd. )."Ilmll -RadiotNews a nd o;m'i//(ll/J, condenser referred to should be Popula1' R adio. removed. AddrllIIs • Make sure that at least 22 volts Clly . ... , .•• .•....•.. . State Please Mention Radio Age When TVriting to Adv ertisers. 50 RADIO AGE for March, 1927 WCBA Charles W. HeimbaclL ___ .. _.. _.. _.. _.. _.. .A11entown. Pa. 254 WFLA Boca-Raton Radio Corp______.__ . ____ Boca Raton, Fla. 440 weBD 'W"ilbur Glenn Voliva._.• ___ •• _.. ______•. ___ .Zion, Ill. 345 WFRL Flatbush Radio Labs.____ . ______. ______Brooklyn, N. Y. 330 we BE Uhalt Radio Co. ____ .._ .. _.. _.. ______.New Orleans, La. 263 WGAL Lancaster Elec. Supply & Const. Co.__ Lancaster, Pa. 248 WeBH University of MississipPL ______.. _.. ___ .Oxford, Miss. 242 WGBB H_ H. Carman______. ______. ______. ___ Freeport, N. Y. 244 WCBM Hotel Chateau______.. _.. ______.Baltimore, Md. 229 WGBC First Baptist Church______. __ . ____ Mernphis, Tenn. 278 weBR C. H. MessteL __ .. ____ .. _.. _.. ______.Providence, R. I. 234 WGBF Fink Furniture Co. ______. ______._.Evansville, Ind. 239 WeBS H. L. Dewing, Portable.__ .. ___ _.. ______.Providence, R. 1. 242 WGBL Scranton Broadcasters, Inc.____ .. __ . ______.Scranton, Pa. 240 weco \\Tashburn-Crosby Co______..Anoka, Minn. 416 WGBR G_ S. Ives... ______Marshfield, Wis_ 229 WCFL Chicago Fed. of LaboL____ . ______Chicago, Ill. 492 \VGBS Gimbel Brothers.._._ .. _. __ . _____ . _____ Astoria, L. 1., N. Y. 316 WCFT Knights of Pythias Home_o _____ . ____ Tullahoma, Tenn. 252 WGBU Florida Cities Finance Co. ___ .Fulford By-The-Sea, Fla. 278 WCGU C. G. Under______Lakewood, N. J. 351 \VGBX University of Maine______, ______Drono, Me. 234 WCLO C. E. Whitmore______._. ______Camp Lake, Wis. 231 WGCP May Radio Broadcast Corp. ______N ewark, N. J. 252 WCLS WCLS Inc. ______.Joliet, III. 214 WGES Oak Leaves Broadcasting Corp. ______. ______Chicago, Ill. 316 WCMA Culver Military Acaderny__ ___ ~_~~_ ~~ __ ~ __ ~~Culver, Ind 258 WGHB Fort Harrison HoteL______. __ . __ .._Clearwater, Fla. 266 \VCOA City of Pensacola ______. ______Pensacola, Fla. 252 WGHP G. H. Phelps______. __ . ______Detroit, Mich. 270 WCOM 172nd Field Artillery______Manchester, N. H. 252 WGL International Broadcasting Ccrp._ __ _New York, N. Y. 442 WCOT Jacob Conn ______._. ______Olneyville, R. L 265 \VGM Verne and Elton SpenceL ___ . ______Jeanette, Pa. 269 WCRW Clinton R. White.______Chicago, Ill. 416 WGMU A. H. Grebe & Co. ______. _____ (Portablel New York 236 WCSH Congress Square Hotel Co______Portland, Maine 500 WGN The Tribune ______Chicago, Ill. 303 WCSO Wittenberg College ______.5pringfield, Ohio 248 WGR Federal T_ and T_ Co. ______._. ______. ____ Buffalo, N. Y. 319 WCWK Chester W. KeelL ______. ______Fort Wl!lyne, Ind. 234 WGST Georgia School of Technology______Atlanta, Ga. 270 WCWS Chas. W. Selene (Portable) ______Bridgeport, Conn. 232 WGWB Radiocast Corporation______Milwaukee, Wis. 384 WCX Detroit Free Press______Pontiac, Mich. 517 WGY General Elec_ Co. ______SChenectady, N. y_ 379 \VDAD Dad's Auto Accessories, Inc. ______Nashville, Tenn. 226 WHA University of \Visconsin ______.._ .. _. ____ .._Madison, "Vis. 535 \VDAE Tampa Daily Times._._. ___ . ___ .. _.. _ .. __ ._.. _.. _Tampa, Fla. 273 WHAD Marquette University_ .. _.. _.. ___ . ______Milwaukee, vVis. 275 WDAF Kansas City 5tar______. __ . ______Kansas City, Mo. 366 WHAM Eastman School of Music ______Rochester, N. Y. 278 WDAG J. Laurence Martin____ . __ :______Amarillo, Texas 263 WHAP V.i. H. Taylor Finance Cor·p. ______New York, N. Y. 431 WDAH Trinity Methodist ChurclL ______El Paso, Texas 268 WHAR F. D. CooksSons______.Atlantic City, N. J. 275 WDA Y Radio Equipment Corp._. ____ . _____ . __ ._. __ Fargo, N. Dak. 261 WHAS Courier-Journal & Louisville Times____ Louisville, Ky. 400 \VDBE Gilham Electric Co., Inc. ______.Atlanta, Ga. 270 WHAZ Rensselaer Polytechnic Institute______Troy, N. Y. 379 WDBJ Richardson Wayland Elec. Corp". ______Roanoke, Va. 229 WHB Sweeney School Co ______Kansas City, Mo. 366 WDBK Bdcst Co. ______.. ______Cleveland, Ohio 227 WHBA C. C. Shaffer_. __ . ______. __ . ______OiI City, Pa. 250 WDBO Rollins College ______. __ . ______.\¥inter Park, Fla. 240 WHBC Rev. E. P. Graham... _. __ . ______._Canton. Ohio 254 WDBZ Kingston Radio Club______._ .. _. __ Kingston, N. Y. 233 WHBD Chamber of Corrunerce.._~ ______._Bellefontaine, Ohio 222 WDEL \Vilmington Elec. Specialty Co. __ . ___ . 'Wilmington, Del. 266 WHBF Beardsley Specialty Company_____ . __ .. Rock Island, Ill. 222 WDGY Dr. George VV. Young. _____ .._. __ . __ ... 1\1inneapolis. Minn. 263 WHBL C. L. Carrell (Portablel _____ . ______. ______Chicago, Ill. 216 WDOD Chattanooga Radio Co., Inc. ______Chattanooga, Tenn. 256 WHBM C. L. Carrell (Portablel-______._. ______Chicago, Ill. 216 \VDRC Doolittle Radio Corp. ______New Hav~n, Conn. 268 WHBN First Ave. Methodist Church_____ ..5t. Petersburg, Fla. 238 WDWF Dutee vVilcox Flint, Inc. ______Cranston, R. 1. 441 WHBP Johnstown Automobile Co.______._Johnstown, Pa. 256 WDWMRadio Industries Broadcast Co ______Newark, N. J. 280 WHBQ St. John's M. E. Church South. ______Memphis, Tenn. 233 WDXL vVDXL Radio Corp____ .._ .. ______Dctroit, Mien. 297 WHBU Riviera Theatre & Bing's Clothing______Anderson, Ind. 219 WDZ J. L. Bush ______. __ . _____ . ______Tuscola, Ill_ 278 WHBW D. R. Kienzle______Philadelphia, Pa. 216 WEAF National Broadcasting Co. __ . ______New York, N. Y. 491 WHBY St. Norbert's College______.. West de Pere, Wis. 250 WEAl Cornell University______.. _.. __ . __ . ______Jthaca, N. Y. 254 WHDI W. H. Dunwoody Institute._._ .. _. __ Minneapolis, Minn. 278 WEAM Bor_ of N. Plainfield ______.. ____ North Plainfield, N_ J. 261 WHEe Hickson Electric Co .• Inc .. ______. __ .. ___ Rochester, N. Y. 258 WEAN The Shepard Co.__ .. _. __ .. _.. _. ______Providence, R. 1. 367 WHFC Triangle Broadcasters______._. ___ ._ ...... _Chicago. Ill. 258 WEAO Ohio State University______.. _Columbus, Ohio 294 WHK The Radio Air Service Corp______Cleveland, Ohio 273 WEAR \Villard Storage Battery Co. ______Cleveland, Ohio 389 WHN George SchubeL ______New York, N. Y. 361 WEAU Davidson Bros. Co. __ . ___ . __ ._ ..__ ._.. _... Sioux City, Iowa 275 WHO Banker's Life Co. ______. ____ Des Moines, la. 526 WEBC \\TaIter Cecil Bridges .. _.. ____ ._ .. _. __ . __ .. _.. -S uperior, \IV'is. 242 WHOG Huntington Bdcstrs. Assn. ______Huntington. Ind. 242 WEBE Roy W. Waller______. ______. __ Cambridge, Ohio 234 WHT Radiophone Broadcasting Corp. ______Deerfield, Ill. 238 \VEBH Edgewater Beach HoteL ______Chicago, 111. 370 WIAD Howard R. Miller... ______. ______Philadelphia, Pa. .250 WEBJ Third Avenue Railway Co. ______._Ne w York, N. Y. 273 WIAS Home Electric Co. ______Burlington, Iowa 254 WEBL R. C. A. Show (Portablel___ ~.---.--- -New York, N. Y. 226 WIBA Capital Times~Strand Theatre.. ______. _____ Madison. Wis. 236 WEBQ Tate Radio Corp.______. __ . ______. __ . ___ __ Harrisburg, Ill. 226 WIBG St. Paul's Protestant E. Church..... _._Elkins Park, Pa. 222 WEBR H_ H. HowelL ______. __ . ______Buffalo, N. Y. 244 WIBI Frederick B. Zittell, Jr ... ______Flushing, L.I., N. Y. 219 \VEBW Beloit Coll ege.. ______._. __ ~ __ . __ . ______Beloit, Wis. 268 WIBJ C. L. Carrell (Portable) ______Chicago, Ill. 216 WEDC E. Denemark Station______.. ______Chicago, Ill. 250 WIBM C. L. Carrell (Portable) ______._. ______.______Chicago, Ill. 216 WEEI The Edison E lec. Illuminating Co._ .. _.. __ .Boston, IV·lass. 349 WIBO WIBO Broadcasters, Inc ______Cnicago, Ill. 226 WEHS A. T. BeckeL______Evanston, Ill. 242 WIBR Thurman A. Owings. ______.. __ ._ .. _. ______\Veirton, W. Va. 246 WEKD Foulkrod Radio Engineering Co. ____ .Philadelphia, Pa. 250 WIBS T. F. Hunter... ______Elizabeth, N_ J- 203 WEMC Emanuel MissionaryCollege.. _____ BerrienSprings, Mich. 316 WIBU The Electric Farn'---______Poynette, Wis. 222 WENR All-American Radio Corp.__ . _____ ..______._._._Chicago, 111. 266 WIBW C. L. Carrell (Portablel ___ . ______Chicago, Ill. 216 WEPS R. G. MathesoIL ______Gloucester, Mass. 295 WIBX WIBX, Inc _____ . ______. ______Utica, N. Y. 234 WEW St. Louis University______St. Louis, Mo. 360 WIBZ A. D. TruIlL ______. ______. ______Montgomery, Ala. 231 \VFAA Dallas News & Dall as JournaL ______Dallas, Tex. 476 WICC Bridgeport Bdcst. Stations____ .. _... Bridgeport, Conn. 285 WFAM Times Publishing Co ______. __ . __ .... __ .st. Cloud, Minn. 273 WIL Benson Radio Co. ______~ ______5t. Louis. Mo. 258 WFAV University of Nebraska.. __ . ______._Lincoln, Neb. 270 \VIOD Earl G. Fisher Co. ______. ______... Miami, Fla. 248 WFBC First Baptist Church ______. __ ._. __ Knoxville, Tenn. 255 WIP Gimbel Bros. ______.. ____ . __ PhiIadelphia, Fa. 508 WFBE Garfield Place Hotel Co._ __ __ . ______Cin Ci nnat i, Ohio 232 WJAD Jackson's Radio Eng. Laboratories. ___ . ___ vVaco, T exas. 353 WFBG The Wm. F. Gable CO-_. __ . ______Altoona, Pa. 278 WJAG Norfolk Daily News______. ____ .Norfolk, Neb. 270 WFBJ St. J ohn's University____ _. __ ._ •. _. ___ ._Collegeville, Minn. 236 WJAK Kokomo Tribune.. ______._ .. _. _____ .. _.. ___ Kokomo, Ind. 254 \VFBL The Onondaga Co. ____ ._ .._____ ._. ______.$yracuse, N . Y. 252 \VJAM D. M. Perham... ____ ..____ .. _.. _.. ______Cedar Rapids, Iowa 268 WFBM Merchants Heat & Light Co ______lndianapolis, Ind. 268 WJAR The Outlet Co __ . __ ._. ______. ______Providence, R. I. 484 WFBR Fifth Infantry National Guard ____ ._. ____ Baltimore, Md. 254 WJAS Pittsburgh Radio Supply House._. _____ .Pittsburgh, Pa. 275 WFBZ Knox Colle~e.--.------.--.------G. le .b urg, IlI_ 254 WJAX City of J ackwnvillo _____ . __ ._. ______Jacksonville, Fla_ 337 WFCI Frank Crook, Inc. __ ._. ______..._ .. _____ . __ .Pawtucket, R. I. 238 WJA Y Cleveland Broadcastin~ Corp.______Cleve1and, O. 436 WFDF F. D. Fallain______._. ___ . ______Flint, Mich. 234 WJAZ American Bdcast Corp.______.Mt. Prospect, Ill. 329 WFI Strawbridge and Clothier____ .. ______Philadelphia, Pa. 394 WJBA D. H. Lentz, Jr.____ . ______. ______-Ioliet, IlL 207 WFKB Vesta Battery Corp.____ . __ . ______. __ . ______. __ Chicago, Ill. 217 WJBB Financial JournaL ____ . __ ._. ____ . ___ ... _.St. Petersburg, Fla. 245 RADIO AGE for March, 1927 51 (and possibly up to 45 with dif­ ferent tubes) is applied to the plate of the oscillator to make certain it will oscillate over its entire range. This voltage can be gradually cut down until a value is reached where the oscil­ A Quality Voltmeter lator just maintains oscillation. for checking fila­ m en t voltage ofRadi­ The same can be said to be true ata, Victor, Bruns­ of the first detector. Too low a Pattern wick and other sets voltage on its plate might pre­ No. 135-A vent regenerative effects in the loop, while too great a voltage might produce entirely too much regeneration and finally oscilla­ tion in the loop circuit. Again we would emphasize the necessity of using good tubes. Filament Control One poor tube in one of the in­ Voltmeter control of radio tube fil aments­ termediate stages, or the first de­ -impro ves r eception -saves tubes tector, will cause its owner con­ -preserlJes batteries siderable worry until the offend­ -gives you additional radio satisfaction ing tube is located and replaced with a good one. These are several real advantages The Jewell pattern No. 135-A tip jack voltmeter plugs into the tip jacks It is also not advisable to have installed on the panel of many of the new radio sets on the market. Scale too much metal (such as an audio ranges of 0-5, 0 -7 or 0-50 volts, are available. It has an adjustment feature transformer) located close to one that insures horizontal position of the scale regardless of the tip jack ar­ rangement. ~ of the air core intermediates Write for special circular _Vo. 1015. since the presence of such metal will materially change the oper­ Jewell Electrical Instrument Co. ation of that particular filter. 1650 Walnut St., Chicago It should also be remembered "27 Years Making G ood I nstruments" while the long wave transform­ ers are peaked at one value for 201-A tubes, their peak will be different if used with the 199 We Carry a Complete Line of Parts type. This shift in kilocycles For the Ideal Model Worlds R ecord Super 8 and other circuits. may run anywhere from 10 to 15 kilocycles. For example a long In writing us SPECIFY just what hook-up you are interested in wave transformer peaked for 40 WHOLESALE RETAIL kilocycles with 201-A tubes will probably peak at around 55 kilo­ cycles when used with 199 tubes. REWARKELEC1'IDC CO. The same would hold true for peaks of almost any transformer. %f/zi.!!!l bul ~acho~' In operation of the set on lo­ 226 W EST MADISON STltEET cals at times there will be a ten­ dency towards distortion on loud TELEPHONE. signals. Under such circum­ MAIN 462.7 stances it is advisable to remove the 200-A detector tube and in­ sert a UX112 which is much CHICAGO ILLINOIS sturdier and less apt to stagger under heavy loop energy shock. RADIO AGE SUBSCRIPTION BLANK Radio Age, Inc. Worlds Record Supers Custom 500 North Dearborn Street, Chicago $2.50 A YEAR Built for Gentlemen: Please enter my subscription for RADIO AGE. fo r one year, beginning with Power and Quality the ._ .. __ . ___ _ . __.. ... i5Sue, for which I enclose $2.50. Ten Kilocycle Selectivity Name __ .. _. ____... _ ..... _ Street Address. ___

BREIT RADIO COMPANY City__ ._ ..... _ ___ _ .... ._... State. 417 LAKE ST., MAYWOOD, ILL. Send ca.sh. money order or draft (3·27)

Please Mention Radio Age When W riting to Advertise?'s. 52 RADIO AGE for March, 1927

WJBC Hummer Furniture Co. ______LaSa11e, 111. 234 \VM:AF Round Hills Radio Corp. ______Dartmouth,l\1ass. 441 WJBI Robert S. J ohnsoll ______Red Bank. N. J. 219 \VMAK Norton Laboratories.. ______Lockport, N. Y. 266 \VJBK E. F. Goodwin ______Ypsilanti, Mich. 233 WMAL M. A. Leese.. ______'Washington, D. C. 294 WJBL Wm. GushaFd Dry Goods Co .... _...... _ .. _... Decatur, JIl. 270 WJ\.1AN Haskett Radio Station______Columbus, Ohio 278 WJBO Valdemar Jensen ______New Orleans, La. 268 WMAQ Chicago Daily News-______Chicago, Ill. 447 WJBR Omra Drug Stores.. ______Omro, \Vis. 227 WMA Y Kingshighway Presbyterian Church____ St. Louis, Mo. 248 WJBT John S. Boyd. .. _.. _.. _...... _.. _.. _."."_"_,,,,,Chicago. JIl. 468 \VMAZ Mercer University______~ ______Macon, Ga_ 261 \VJBU Bucknell University______Lewisburg, Fa. 211 WMBA LeRoy Joseph Beebe (Porta ~ le ) ",-,,,.,Newport. R. J. 250 WJBW C. Carlson, Jr. ______.New Orleans, La. 270 WMBB American Bond & Mortgage Co. ______Chicago, Ill. 250 WJBY Electric Construction Co. ______Gadsden, Ala. 260 WMBC Michigan Broadcasting Co., I nc. ______Detroit, Mich. 256 WJBZ Roland G. PalmeL. __ .___ .______Chicago Heights, Ill. 420 WMBD Peoria Heights Radio Lab. ______Pcoria Heights, Ill. 279 WJJD Supreme Lodge, L. O. of lVioose ______Mooseheart, ]11. 370 \VMBE Dr. C. S. Stevens_ ____ ~.:. ______5t. Paul, Minn. 220 \VJPW J. P. WilsOIL "",,_,,_,,_,,_,,_ "",,,,,_,,,Ashtabula, Ohio 240 \VMBF Fleetwood Hotel Corp ______Miami Beach, Fla. 384 WJR Jewett Radio & Phonograph Co. ______.Pontiac, Mich. 517 WMBG Havens & Martin ______Richmond, Va. 220 WJUG U. B. Ross,,,_,,,,,,_,,_,,_,,_,,_,,_,,_,,,New York, N. Y. 517 WMBH Edwin Dudley Aber, Portable.. ______Chicago, Ill. 280 \VJY Radio Corp. of Americ~ ______. _____ NewYork, N. Y. 405 WMBI Moody Bible Institute-______Chicago, Ill. 288 \VJZ Radio Corp. of America______Bound Brook, N.]. 454 WMBJ Wm. Roy McShaffrey._.,., .. _, __ ",,,,,,,,,,.,,Monessen. Pa. 278 WKAF vVKAF Broadcasting Co. ______IViilwaukee, \Vis. 261 WMBK John C. Slade ... "_,.,."., .._ .. _.,_"_",,,,_,,,Hamilton. Ohio 360 WKAQ Radio Corp_ of Porto Rico ______San Jaun, P. R. 341 \VMBL Bonford Radio Studios______Lakeland, Fla. 410 WKAR Michigan State College..------East Lansing, Mich. 286 WMBM Seventh Day Adventist Ch12n:; ~l ______.Memphis, Tenn. 245 WKAV Laconia Radio Club______Laconia, N. H. 422 \VMBO Radio Service Laboratories_ _. ______Auburn, N. Y. 238 \VKBA Arrow Battery Co.______Chicago, Ill. 210 WMBS Mack's Battery Co. ______Harrisburg, Pa 360 WKBB Sanders Bros.______Joliet, 111. 283 WMC Commercial Pub. Co.______JVlemphis, Tenn. 500 WKBC H. L. Ansley ______~ ______Birmingham, Ala. 225 WMCA Greely Sq. Hotel Co."""""""._,._.. , ... ,Hoboken. N. J. 341 WKBE K. & D. Electric Co. ______vVebster, Mass. 270 WMHA Young Men's Hebrew Ass'n ______New York, N. Y. 230 WKBF N _ D. \Vatson______Jndianapolis, Ind. 244 WMPC First Methodist Church_ __ .______Lapeer, Mich. 222 WKBG C. L. Carrell (PortablcL""",,_,,_,,_,,_ ...,.Chicago. Ill. 216 \VMRJ Peter J. Prinz.______Jamaica, N. Y. 227 WKBH Calla way M usic Co ______LaCrosse, Wis. 250 WMSG Madison Sq. Gard. Bdcast. Corp. New York, N. Y. 302 WKBI F . L. SchoenwoIL_"""_" _ "" """,,,_,,_.,,Chicago. Ill. 220 WMVN Edward J. Malone. Jr.""""",_"_,,_.. , .. ,,Newark, N. J. 476 WKBJ Gospel Tabernacle Inc .______5t. Petersburg, Fla. 282 WNAB Shepard Stores _~ ______Boston, Mass. 280 WKBL Monrona Radio Mfg. Co. ______Monroe, Mich. 250 'VNAC ShepardStores..______Boston, Mass. 430 WKBM J. W. JoneL_" .. " _"",,_,,_,,_.. _,,_,,,Newburgh, N. Y. 285 WNAD University of Oklahoma______N orman, Okla. 254 WKBO Camith CorporatioIL______Jersey City, N. J. 220 \VNAL Omaha Central High SchooL ______Omaha, Nebr. 258 WKBP Enquirer and News______Battle Creek, Mich. 265 WNAT Lenning Brothers Co.____ .:.. ______Philadelphia, Pa. 250 WKBQ Starlight Amusement Parlc______New York, N. Y. 285 \VNAX Dakota Radio Apparatus Co. ______Yankton. S. Dak. 244 WKBS P. M . Nelson",_"__ ,_"_,,_,._.. _,,_, __ ,,,,,Galesburg, Ill. 361 WNBH New Bedford HoteL ______New Bedford, Mass. 248 WKBT First Baptist Church ______New Orleans, La. 252 WNJ Herman Lubinsky______Newark, N.]. 350 WKBU H_ K. Armstrong (Portable) ______Newcastle, Pa. 238 WNOX Peoples Tel. & Tel. Co______KnoxviIle, Tenn. 268 WKBV Knox Battery arrd Electric Co. ______Brookville, Ind. 236 WNRC 'VV. B. Nelson ______Greensboro, N. C. 224 WKBW Churchill E vang. Ass'n"" ""_,, _,, _,,_, ..,,Buffalo. N. Y. 362 WNYC Dept. of Plants & Structures""""""New York, N. Y. 526 WKBY F ernwood Wuick (portable) ______Danville, Pa. 220 WOAI Southern Equipment Co.______San Antonio, Texas 394 WKBZ K. L. AshbackeL""""_"",,_,,_,,_,,Ludington. Mich. 256 WOAN J. D. Vaughn------_-----Lawrenceburg, Tenn. 356 WKDR Edward A. DatcL______Kenosha, Wis. 428 WOAX Franklyn J. Wolff",_"""_,._"_",,,,_,,_,,,Trenton, N. J. 240 \VKJC Kirk Johnson & Co.______Lancaster, Pa. 25~ WOBB Longacre Eng. & Const. Co. ______Chicago, Ill. 555 \VKRC Kadel Radio Corp.------Cincinnati, Ohio 422 \VOCB Orlando Broadcasting Co ______Orlando, Fla. 294 WKY Hull and Richards______Oklahoma City, Okla. 275 WOC Palmer School of Chiropractic. ______Davenport, Iowa 484 \VLAC Life & Casualty Ins. Co. ______N ashville,iTenn. 226 WOCL A. D. NewtoIL ______Jamestown, N. Y. 275 WLAL First Christian Churc ~ ______Tulsa, Okla. 250 WODA O'Dea Temple of Music. ______Paterson, N. J. 391 WLAP \Vm. V. Jordan______Louisville, Ky. 275 WOI Iowa State ColIege.. ______;_Ames, Iowa 270 \VLB University of M innesota ______Minneapolis, Minn. 278 \VOK Neutrowound Radio Mfg. Co. ______Homewood, Ill. 410 WLBA Philadelphia School of Wireless TeL_Philadelphia, Pa. 236 WOKO Harold E.SmitlL.,_.,_.. _.. _ .. __ .",, __ , __ ,_,Peekskill, N. Y. 232 WLBC D. A. Burt otL ______Muncie, Ind. 224 WOKT Titus-Ets CorporatioIL------Rochester, N. Y. 340 WLBE J - H. Fruitma IL ______Brooklyn, N. Y. 231 WOMT Mikado Theater______Manitowoc, Vlis. 254 WLBF E. L. Dill ard ______Kansas City, Mo. 211 WOO John WanamakeL._..... ___ ",_,_"_.. _.,,Philadelphia. Pa. 508 WLBG R. A. Gamble ______Petersburg, Va. 332 WOOD Grand Rapids Radio Co. ______Fernwood, Mich. 242 \VLBH Joseph J . Lomba rdL______Farmingdale, N. Y. 230 \VOQ Unity SchooL______~ ______Kansas City, Mo. 278 WLBI Aloysius Yare ______East \Venona, Ill. 297 WOR L. Bamberger and Co.______Newark, N_ J. 405 \VLBJ Henry Grossman ______Cleveland, Ohio 300 'VORD People's PulpitAssn.--~------Batavia, Ill. 275 WLBL \;Visconsin Dept. of Markets______Stevens Point, Wis. 278 WOS State Market Bureau ______Jefferson City, Mo. 441 WLBN William Evert H iler (Portable),_"""",,_ ... Chicago, Ill. 225 WOW Woodman of the World.... , .... _,_"",,_,,_ .. 'Omaha, Nebr. 526 WLBO Frederick A. T r ibbe, Jr. ______Galesburg, Ill. 243 WOWO Main Auto Supply Co______Fort \Vayne. Ind. 227 WLBQ E . Dale TrouL""_"",,_,,_,,_,,_,,_,,_,,_,,_,,,Atwood. Ill. 23 WPAB Radio Corp. of Virginia ______Norfolk, Va. 319 WLBR Alford Radio Company ______Belvidere, Ill. 335 WPAK N. D.Ag. College.. ,_, __ ,.",,,Agricultural College,N. D. 275 \VLCI Lutheran Association ______Ithaca, N. Y. 266 WPAP (See WQAO).,.""""_"_,._.. _"_,,,,, __ ,,_,,,Cliffside. N. J. 361 WLIB Liberty Vleekly , Inc. ______Elgin, 111. 303 WPCC North Shore Congo Churc~ ______Chicago, Ill. 258 WLIT Lit Bros. ______Philadelphia, Pa. 394 \VPCH Concourse Radio Corp.------New York, N. Y. 273 WLPP Robert A. Fox.. ______Ashland, Ohio 220 WPDQ H. L. TurneL._.. _.. _ .. _",., .. " ..... _"_"",,,Buffalo, N. Y. 205 WLS Sears Roebuck & Co.______Crete, Ill. 345 WPEP Maurice Mayer ______\Vaukegan, Ill. 213 WLSL Lincoln Studio s.. ______Cranston, R . 1. 441 \VPG The Municipalityof Atlantic City__ Atlantic City, N. J. 300 WLTS Lane Technical H igh SchooL ______Chicago, 111. 258 \VPRC 'Wilson Printing & Radio Co. ______Harrisburg, Pa. 216 WL W Crosley R adio Corp ______Harrison, Ohio 422 WPSC Pennsylvania State College ______State College, Pa. 261 \VLWL Paulist Fathers______N ew York, N . Y. 384 \VQAA Horace A. Beale, J r. ______~ ______Parkersburg, Pa. 220 WLBT Harold WendeIL ______Crown Point, Ind. 230 WQAE Moore Radio News Station______..springfield, Vt. 246 \VLBU Matthew B. GreineL ______Canastota, N. Y. 220 \VQAM Electrical Equipment Co. ______Miami, Fla. 285 WLBV John F. \ Veimer & D. A. Sniclc ______Mansfield, Ohio 231 WQAN Scranton Times______SCranton, Pa. 250 WLBW Petroleum T elephone Co. ______Dil City, Pa. 321 WQAO Calvary Baptist Church",_... , . . _"_.,,,,,,.,Cliffside, N. J. 361 WLBX John N. Brahy".. . "_"",,_,,_,,,Long I sland City, N. Y. 231 \VQJ Calument Rainbo Broadcasting Co. ______Chicago, III. 444 WLBY Aimone Electric ______lron Mountain, Mich. 250 WRAF The Radio Club (Inc.),.,_.. " ."",_"_",,... LaPorte, Ind. 227 WLBZ Thompson L. Guem sey______Dover-Fox croft, Maine 299 WRAH S. N. Read",_",,,,,,,,_,,,,,._ .. , ... _,,_,,., ... Providence. R. I. 233 WMAC C. B. Meredith______Casenovia, N. Y. 275 WRAK Economy Light CoL.. ... _. ... ",,,.,.,,_ ... _,Esca.naba. Mich. 256 RADIO AGEJor March, 1927 53

RADIO'S Standardization Is Responsible For LEADING Radio Industry Stabilization PUBLICATIONS By A. J. CARTER'

HERE has been recently a ments. roo Arrestors and Aerials. T great deal of comment 11. Panels. 12. Resistance through the medium of the Units. 13. Condensers (Fixed). press regarding the need for 14. Radio Wiring for Buildings. standardization in the radio in­ New committees are being dustry. It is apparent that the formed from time to time and radio public does not realize what this work will be carried on in­ great strides already have been definitely. It is the aim of the made. Neither do they appre­ R. M. A. eventually to standard­ ciate what a vast amount of r e­ ize the entire industry. search is required. The co-operation of the Insti­ Great care must be taken to tute of Radio Engineers and the prevent standards from being excellent support of the industry adopted that will limit or retard as a whole have resulted in bring­ the development of new products ing about, in two years, a degree of standardization that required The CITIZEN'S RADIO CALL BOOK and ideas. Consequently this is is ~dio'8 Greatest Publication. Cireu­ from six to ten years in the auto­ !atlon 80,0,000. Contains all the latest a task that can be done only by InformatIOn of construction 80 simply engineers who have had experi­ mobile and other ind ustries. told anyone can build superheterodynes as easily as laboratory men. Large ro­ ence in every phase of the indus­ It would be too lengthy to give togravure section contains beautiful photos of leading station announcers tTy. details regarding the benefits al­ and entertainers. Also (!ontalns the ready derived from this work. most (!omplete list of the World's broad­ The Radio Manufacturers' As­ casting stations---every one--t h e i r One of the most important ef­ transmitting schedules, wave lengths, sociation is ideally equipped to s logan and plenty of space under each fects, however, has been the ten­ to log that station for future reference. carry out this work since it is Really Radio's Greatest Publication. composed of the principal and dency toward stabilization, which YOU'll be delighted. representative manufacturers of is brought about in the following ,Price only 50 cents postpaid. the radio industry, consequently manner. having the support and co-opera­ The raw material supplier is tion of their engineering depart­ benefited beca use there is a ments. greater demand for standard The work is being carried out material. Consequently he can systematically by means of sub­ anticipate demands, carry a committees composed of engi­ larger stock, and give better de­ neers and representatives of in­ liveries at a reduced cost. terested manufacturers. Public The manufacturer having a opinion and that of manufactur­ ready source of raw material can ers is solicited by means of ques­ keep his plant running con­ tionnaires. This information, stantly, make prompt deliveries, supplemented by the experience thus preventing cancellation of of' engineers, forms the basis of delayed orders. a recommended standard specifi­ Radio misfits have practically cation which is submitted at a ceased to exist. Parts are inter­ regular meeting for final accept­ changeable, therefore the dealer ance. and jobber are not required to carry duplicate stocks of parts. Sub-committees have been The CITIZEN'S RADIO AMATEUR The manufacturer has, in this formed to investigate the follow­ CALL BOOK is an international li st of way, earned the confidence of call letters, names and addresses of the ing subj ects. Many of their rec­ Wo~ ld' s amateur tranemitters-ARRL the trade. In view of this the officlal traffic relay stations lis t. Com­ ommendations have already been piled from official sources and the most jobber and dealer are likely to or­ authentic list obtainable anywhere. Re­ adopted; others will make their member, the whole World-U. S., Can­ reports at subsequent meetings: der in advance of the consumer ada. England. AUstralia, France. Ger­ demand. many, etc. The whole international list. 1. Wiring Devices (Cords, col­ Abo commercial ship and land stations. Standardization has already Price only 75 cents postpaid. ors, cord tips, etc.). 2. Variable If you are unable to obtain eitber of the enabled manufacturers to fur­ Condensers and Dials. 3. Rheo­ :~:.~e d-::I~~oonrec;a~:I~~~~e~n~b~~o'!ihob~ nish the consumer with a better stats. 4. Transformers. 5. sent postpaid upon receipt of the prod uct at a lower cost. amount in U. S. stamps, coin, check or Plugs, Jacks and Switches. 6. P. O. money order. The radio industry has made ~ockets. 7. Receiving Sets. 8. Citizens Radio Call Book iVacuum Tubes. 9. Test Instru- rapid progress and it is largely R. 508 S. Dearborn St. due to the foresight of the Chicago Illinois ~:'\&n~ ~!~r~o.R~dgoc:ittee, R. M. A. M. A. Please Mention Radio Age When Writing to Advertisers. 54 RADIO AGE for March, 1927

WRAM Lombard College. .. _.. _.• _.. _.. _ .. __ .._ .. _.. -Galesburg, Ill. 244 WSIX 638 Tire & Yule. Co .. _. __ .. _.. _.. _. __ ._.Springfield, Tenn. 250 WRAV Antioch College.. ______Yeilow Springs, Ohio 263 WSKC World's Star Knitting Co._. __ ._.__ ..__ .. Bay City. Mich. 263 WRAW A venlle Radio & Electric Shop______Reading, Pa. 238 WSM Nashville Life & Accident Ins. Co.. _.. Nashville, Tenn. 283 WRAX Eeracah Church, Inc ______Philadelphia, Pa. 268 WSMB Saenger Amuse. Co.___ . ___ ._...... ______New Orleans. La. 319 \VRBC Immanuel Lutheran Church.. ______Valparaiso, Ind. 278 WSMH Shattuck Music Hous~ .. _.. ____ . __ .. __ . __ .Dwosso, Mich. 240 WRC Radio Corp. of America.______\Vashington, D. C. 468 WSMK S. M. K Radio Corp.... _.. _.. _ .. _.. _.. _.. _... Dayton, Ohio 275 WRCO Wayne Radio Co.... _.. _.. _.. _.. _.. _ .. _.. _... Raleigh, N. Co 252 WSOE School of Engineering.. __ .. _.. _. ___ . __ ._.Milwaukee, VYis. 246 WREC \Vooten's Ra-1io Shop ______"'hitehaven, Tenn. 254 WSOM Union Course Laboratories.____ . __ ..'Voodhaven, N. Y. 288 WREO Reo Motor Car Co. ______Lansing, Mich. 285 WSRO Harry W. Fahrlander____ ._ .. __ ._ .._ .. _... Hamilton, Ohio 252 WRES H. L. Sa"''YeL ______\Voloaston, Mass. 300 WSSH Tremont Temple Bap. Church... __ ._ .. _... Boston, Mass. 261 'VRHF \Vash. Radio Hospital Fun~ _____ \Vashington. D. C. 256 WSUI State University of Iowa Iowa City. Iowa 484 \VRHM Rosedale Hospital, Inc.... _. __ .. ______l\·Iinneapolis, !vfinn. 252 WSVS Seneca Vocational School... _____ . ___ . __ . ____ Buffalo, N. Y. 219 \vRK Doron Bros._ .. _. __ . ___ . ___ ._ .._ .. _. ______.Hamilton, Ohio 270 WSWS Richmond Harris & Co. ______._. ______Batavia, Ill. 275 WR1r:l University of Illinois.._ .. _.. _.. ______. __ . _____ Urbana, Ill. 273 WSYR Clive B. Meredith. ______..... _.... _. __ ....Syracuse. N. Y. 353 \VRldU A. H. Grebe & Co., Inc._ .. ____ . __ Motor Yacht uMU_l" 236 WTAD Ill. Stock Medicine Corp._ .._ .. __ . __ . __ ._ .. _.Quincy, Ill. 236 \VRNY Experimenter PublishingCo.... _.. _ .. _Coyetsville, N. Y. 374 WTAG 'Vorcester Telegram._.. ___ . ______..__ Vlorcester, Mass. 545, \VRR City of Dallas.. ___ . ____ .. _.. _.. __ . ______Dallas, Tex. 246 WTAL Toledo Broadcasting Co. ____ . ______. __ .._._.Toledo, Ohio 252 \VRRS Racine Radio Corp._ ...... ______Racine, \Vis. 360 WTAM 'Villard Storage Battery Co._ ..__ ._ .. _... Cleveland, Ohio 389 WRSC The Radio Shop. ____ .. _.. _.. _.. _ .. _ .. _.. _ ... Chelsea, Mass. 270 WTAQ C. S. Van Gordon. .. _.. _ .. _.. _.. _ .. _ .. _._ .. Eau Claire, \Vis. 254 WRST RadioteI Mfg. Co., Inc._____ . ______.._ .. _Bay Shore, N. Y. 216 WTAR Reliance Electric Co.. ___ . _____ . __ . ___ ._ .. _. __ Norfolk, Va. 261 WRVA Larus & Brother Co., Inc._ .._. _____ ..__ ._.. _Richmond, Va. 256 WTAW Agricultural & Th-Iech. Col. of Texas College Sta., Texas 270 \VSAI United States Playing Card Co.. __ . __ .. Cincinnati, Ohio 326 WTAX 'Villiams Hardware Co... ______._ .. __ . ___ .... Streator. 111. 231 V/SAJ Grove City College... _.. _.. __ . __ ._ .. _. __ ._.Grove City, Pa. 229 WTAZ Thomas J. 1\.fcGuire._._ ..__ . __ ._. __ ... Lambertville, N. J. 261 \VSAN Allentown Call Publishing Co. lnc .. _._._Allentown, Pa. 229 WTHO 'V. J. Thomas Radio Co... __ "__ . __ . __ .. .Ferndal~. Mich. 407 \VSAR Daughy & \Velch Electrical Co .... _._ ... Fall River. Mass. 322 WTlC Travelers Insurance Co._ .._ .. _ .. _. __ .. ___ Hartford. Conn. 476 WSAV Clifford W. Vic1< ... _.. _ .. _ .. _.. _.. _ .. _.. _... Houston, Tex. 248 WTRC 20th Dist. Republican Clu'b.. .. _.. __ ._._New York, N. Y. 240 WSAX Zenith Radio Corp. (Portible) ... _.. _ .. _.. _.Chicago, HI. 268 WTRL Technical Radio Laboratory. ___ ._.f.: idland Park, N. J. 280 \VSAZ Chase Electric Shop_. __ .._ .. __ ._. __ . ______Pomeroy, Ohio 244 WWAE L J. Crowley______.... _. ______._.Chicago, Ill. 242 \VSB Atlanta JournaL__ .. _.. _.. _.. _.. .:-.._ .. _ .. _.. __ .Atlanta, Ga. 428 WWJ Evening News Assn. (Detroit l\c\\'s) Detroit, Mich. 353 WSBC World Battery Co.... _.. _.. _.. _.. _ .. _ .. _ .. _ .. _ ... Chicago, 111. 288 WWL Loyola University._._. ___ ._ .. _. __ . __ .... _New Orleans, La. 275 \VSBF Stix Baer & FuIIer... _.. __ ._.. _.. _. __ .. _. __ ...St. Louis, 1\10. 273 \VWNC Chamber of Commerce. ______._ .._. __ ._..Asheville, N. C. 254 \VSBT South Bend Tribune.._____ . ___ . ______.South Bend, Ind. 316 WWPR Detroit Police DepL ______._. __ Detroit, Mich. 300 \VSDA Seventh Day Adventist Church.. __ ... New York, N. Y. 261 WWVA John Co Stroebel, Jr ...... _ .. _.. _ .. _.. _ ... \\neeling, W. Va. 349 WSEA Virginia Beach Broadcasting Co ... \'irginia Beach, Va. 517 WWRL Woodside Radio Labs.... _~._._ .._ .. _ ... Woodside, J\. Y. 258 Dominion of Canada CFAC Calgary Herald.. __ ._ .. ____ .. ______._. __ Calgary, Alta. 434 CJCL A. Couture_ .. _.. _. ___ ._ .. __ . ______Montreal, Que. 279 CFCA Toronto Star Pub. & Prtg. Co.... _____ . __ ..TorontQ. Onto 356 CJGC London Free Press.. _._._ .. _. __ . __ ..__ ._ .. __ ._ .. London, Onto 329 CFCF Marconi \Vireless Teleg. Co., (Ltd.) Ca. IVlont., Que. 411 CKAC La Presse.. __ . ____ .. _.. _.. _.. _ .. _ .. _ .. _ .. _..... l\IIontreal, Que. 411 CFCH Abitibi Power & Paper Co. (Ltd.) lroquois Falls. Onto 500 CKCD Vancouver Daily Province... _. ___ . __ .._Vancouver. B. C. 397 CFCK Radio Supply Co. ______. ______._ ... _.Edmonton, Alta. 517 CKCK Leader Pub. Co. ____ . __ ._ .. _. __ . __ .._. __ ... _... Regina, Sask. 476 CFCN IV. \V. Grant (Ltd.)... _ .. _.. _ .. _.. _...... __ .Calgary, Alta. 434 CKCL Dominion Battery Co.... _.. __ . __ ._ .. ____ .. _.. _.. _ .. Toronto 357 CFCR Laurentide Air SeI-vice ... _. __ . __ .. _.. _ .. _... SudbuI)', Ollt. 410 CKCO Ottawa Radio Association... _ ...... ___ ... _... Ottawa, Ont. 434 CFCT Yictoria City Temp1e.. __ . __ ..__ ._.. _. ___ .. Victoria, B. C. 329 . CKCX Int'l Bible Students Ass'n .. _._ .._ .. ____ .. _.. _ .. _Toronto 291 CFCU The Jack Elliott (Ltd.) ... _.. _ .. _ .. _ .. _.. _... Hamilton,Ont. 341 CKFC First Congregational Church______._Vancouver, B. C. 411 CFHC Henry Birks & SOns.. __ ..______. __ .._ .. _. __ Calgary, Alta. 434 CKLC \Vilkinson Electric Co. (Ltd.) __ ... _._ .. _... _.Calgary, Alta. 434 CFKC Thorold Radio Supply... _.. _ .. _ .. _.. _ .... _... Thorold, Onto 248 CKNC Canadian National Carbon Co._ .. _... _._ .....Toronto. Ont. 357 CFQC The Electric Shop (Ltd.)... _ .. _ .. _ .. _ ... Saskatoon, Sask. 329 CKOC ' Vent worth Radio Supply Co ... __ .._ ..... Hamilton, Onto 341 CFRC Queens University. ______.._____ . __ ._ ..__ Kingston, Ont. 450 CKY Manitoba Tel. System.-______\Vinnipeg, Man. 384 CFXC \VestminsterTrust Co. ____ . ___ . ______."'estminster, B. C. 291 CNRA Canadian National Railways__ ._.. __ ....1\loncton, N. B. 322 CFYC Commercial Radio (Ltd.)... _. __ .. _.. _... Vancouver. B. C. 411 CNRC Canadian National Rai!ways... _. __ .... _._.Calgary, Alta. 435 CHBC The Calgary AlbertaIL .. _.. _.. _ .. _ .. _.. __ ... Calgary, Alta. 434 CNRE Canadian National Railways.. __ . ____ .. .Edmonton, Alta. 517 CHC;\I Riley & McCormack (Ltd.)... _.. _ .. _.. _... .. Calgary, Alta. 434 CNRM Canadian National Railways.._. _____ . ___ Montreal, Que. 411 CHCS The Hamilton Spectator. ..__ . __ . __ . __ . __ .. Hamilton. Ont. 341 CNRO Canadian National Railways.. .._. __ .._. __ ...Ottawa, Ont. 435 CHIC Northern Electric Co.... _. __ . __ .. _.. __ . __ ... __ Toronto. Ont. 357 Canadian National Railways_. ___ . __ . __ .. __ Regina, Sask. 312 CHNC Toronto Radio Research Society.. _ .. _ .. _.Toronto. Onto 357 CNRR CHUC International Bible Ass'n ..__ . __ .. _.. _ .. _Saskatoon. Sask. 329 CNRS Canadian National Railways._. _____ ._.5askatoon, Sask. 329 CHXC R. Booth, Jr ... __ .. _ .._. __ . __ ..__ . __ . __ ._. ___ ...Ottawa, Ont. 434 CNRT Canadian National Raihvays._._ .. _. __ ._ ... Toronto, Onto 357 CHYC Northern Electric Co.... _.. _.. _. __ ..__ . __ .Montreal, Que. 411 CNRV Canadian National Railways. ______._.Vancouver, B. C. 291 CJCA Edmonton JournaL._.. ____ .. _.. _.. _. __ ... Edmonton. Alta. 511 CNRW Canadian National Railways_. __ ._._ ...\\Tinnipeg, Man. 384 Republic of Mexico CYB Mexico City._ .._ .. _ .. _.. _ .. _ .. __ ... 380 CYL Mexico City.. ..._ .. _.. _.. _ ...... _... 400 I CZE Mexico City._ .._ .. _.. _ .. __ .. _.. _ ... 350 Republic of Cuba PWX Cuban Telephone Co ... Havana 400 5D\V R. S. Calderon... _.. _._.Matanzas 200 6KW F. H. Jones.. .. _...... _ ... Tuinucu 272 2BY F. \\'. Borton._.__ .. _.. _.Ha vana 260 6VY Jose Ganduxe._.. _... Cienfuegos 260 7SR S. Rionda. .. _.. __ .Central Elia 350 20K M. G. Velez ...... _... Havana 360 20L Oscar Collado______Hayana 257 6JK F. H. Jones... _.. _. __ ._.Tuinucu 340 8BY A. Ravelo... __ ...Santiagode Cuba 250 Great Britain 2LO London ...... _.. _.. _ .. _ .. _.. _.. _ .. _ ... 36515XX Daventry. ____ . __ .._ .. _. __ . __ ._ .._1600 Manchester___ .. __ ._ .. _.. _.. _.. _ ... 378 Newcastle._. __ ..__ ._._____ ..____ .. _. 404 SIT Dublin._.. _.. _.. _.. _ .. _ .. _ ...... _.. _ ... 390 5NO2ZY 5WA ~~;:;~:~.~rn~::=::======::=::=:: ~~~ 2RN 5SC Glasgow_____ .. _.. ___ .. _._. __ .. _... 422 2BE BelfasL.. _.. _.. _ .. _.. _.. _.. _ .. _.. _ ... 440 6BN Bournemouth._. __ ._. __ . __ . __ .. _.. _. 386 1 2BD Aberdeen. ___ .. _.. _.. _ .. _.. _.. _ .. _ ... 495 France LyonL__ .. _.. _ .. _.. _.. _._.. _ ... 550 I Paris (Eiffel Tower) ...__ ...2,650 I Paris..._.. _.. _.. _ .. _.. _.. __ .. _... l,780 I Paris. ___ .. _.. _.. _.. _.. _.. _ ...... _ ..... 458 RADIO AGE for March, 1927 ss Short Waves Improve With Sunspots ECEPTION of radio broad­ R cast programs on fairly long waves generally gets worse as spots on the sun increase, but with short waves, of about 34 meters length, it gets better, Greenleaf W. Pickard told the Institute of Radio Engineers at ELECTONE their annual session. Advantage S has been taken of this phenome­ TRANSFORMERS . non in the new transatlantic radio phone service, because the TESTED-MATCHED-GUARANTEED voice is sent from New York to Designed by E. H. Scott, whose famous receiver, the WORLD'S RECORD SUPER, established FOUR world rec­ London simultaneously on long ords for long distance reception. and short waves, so that as transmission with the long HIGHEST AMPLIFICATION waves gets worse, the short FINEST TONE QUALITY wave transmission improves. SELECTONE Untuned Transfonner-R400-has specially desi&:ne~ closed iron. core, which limits interstage coupling Mr. Pickard has been study­ and IS lmpregnated m a vacuum so that all chara ct eristics ing the relations between activ­ of coil remain constant. The coil design gives an extremely high amplification. Can be used in any circuit requiring a ity of the sun, as indicated by long wave transformer. PRICE. $6.00 the presence of sunspots, mag­ PERFECTLY MATCHED netic storms on the earth, and radio reception. He began the GREATEST SELECTIVITY SELECTONE Tuned Stage Transf orrner-R41 0- is air study in March, 1926, and has core. The matching of these filters is so perfect that where continued it to the present, extreme selectivity is desired, two can be used and are g uar­ measuring chiefly the reception anteed to match perfectly. PRICE, $6.00 from station WBBM of Chicago, Either 199 or 201A Tubes Can Be Used which operates on a wave Send for illustrated literature de­ length of 226 meters. There is scribing Selectone Transformers and FREE tests they undergo. a very close correlation shown between the magnetic charac­ If your dealer cannot supply you, order direct ter of the days, as determined at the Cheltenham, Md., mag­ SCOTT TRANSFORMER CO. netic observatory of the U. S. 7620 Eastlake Terrace, Chicago, III. Coast and Geodetic Survey, and the radio reception at the time. When the monthly averages are Device Eliminates sar y t o provide some gear-shift taken, there is no obvious rela­ Gears in Engines arrangement, by which the tion between the sunspots and T A RECENT meeting of the driver can operate his car rap­ magnetism of radio reception, A Royal Society of Arts, in idly or slowly, the speed of the said Mr. Pickard, but when London, George Constantinesco engine changing much less than weekly averages are used "an delivered, by invitation of the does the speed of the r eal' increase of solar activity is Society, a lecture describing re­ wh eels. The new device does paralleled by an increase in cent developments of his re­ away with this necessity. magnetic disturbance and a de­ markable device called the crease in reception." "torque converter," replacing the usual gear-shift systems of automobiles and similar ma­ chines. This device is described by some engineers as being the GET THE MOST FROM YOUR SET Give.. flI)eci.al hook-u,,", with illuat ..... tiona . ShOW6 most remarkable innovation in U1e,l. . new... t development

MALE HELP speed of the engine which FIREMEN, BRAKEMEN, BAGGAGEMEN, (white or drives it. In gasoline automo­ $g~~ed~onth:~p'nlxp=r~nc:n~~ne~~:;'~. (colored), $150· 278 Railway Bureau, East St. Louis, III. biles, for example, it is neces- Please Mention Radio Age When Writing to Advertisers. STATIONS DiAlS KC IMeters I 2 ---1010 296.9 . - -- I' 1000 299.8 - 990 302:81 980 305:91 1440 208.2 970 309.1 1 - -t--- I -~ I - - - 1430 209.7 960 312.3 1$ - 1420 211.1 1 950 315.6 1410 212.6 940 319.0 --c~~~------I ------1400 214.2 930 322.4 rno:-2-15-.7- 1:------I-- I- -- P-l 920 325.9 1 t--- ; ------~- ;:-- I -- 1380 217.3 I I 910 329.5 ---r--- ~------I --- '-- - 1370 218.8 900 333.1 --+ --1------1----.-- -- 1360 220.4 8901336.9 --~~-+------I -~-- ·1- 1350 222.1 880 340.7 j------~-- ~------~~-- - _ 1- 1340 223.7 870 344.6 1- ---~-- ~------: --- -- 1330 225.4 1 _ m 348.6 1 I .--- - '- 8sO 352.7 1 1320 227.1 '~il - __ I . - - 1310228.9 ___ 840 356.9 - .--- - - 1300 230.6 830 361.2 , :------I - --- 820 365.6 1 1290 232.4 II 1_ I - 1280 234.2 810 370.2 1 1 1- 1270 236.1 I - 800 374.8 1 '1- 1 1260 238.0 790 379.5 1 t- 1250 239.9 780 384.4 ,- - 1240 241.8 770 389.4 ,------760 _12_30 _2_43_._8 +------f_-----I . 394.5 t 1220 245.8 750 399.8 ---r ---f_------I---i---r__ 1210 247.8 740 405.2 ~12-00- r2~4-9.-9~------~--j -r-- 730 410.7 r__!'- ~11~9~0 ·~2~52~.~01 ------f-1--r-­ 720 416.4 --- ~--- f_------~-- I ---r__ 1180 .254.1 710 422.3 =1= -~- II---· f------f--~ --r-­ I ~256.3 700 428.3 r__ I r--- 1160 258.5 6901434.5 ~~~~-~------1-1-- r-- 1 - 1150 260.7 680 440.9 1- r__ 1140 263.0 670 447.5 ------1130 265.3 660 454.3 1=1= 1120 267.7 650 461.3 :=+--- 1110 270.1 - 1100 272.6 640630 1475.9468.5 1' ~- I =I' ---~

1080>10_9,0, 277.62_7_5._1 .:______-.__ - '+ 1070 280.2 590508.2 ---I 106~t 282.8 - I . ::~ ~ ~ 1050[ 285.5 -10-4-~!r. 2-8-8.-31------I -- r--r--' . -:-:-:r:-:_::_:_;______I =1~ 1 - 1030 291.1 ~ '------~-- r-- : - 10201 293.9 I I CLASSIFIED ADVERTISEMENTS If you have anything to buy or sell, don't overlook RADIO AGE'S classified advertise­ ments. The classified advertising rates are but five cents per word for a single insertion. Liberal discounts are allowed on three, six and twelve-time insertions, making rate of 4 1-2, 4 and 3 cents a word per insertion respectively. Unless placed through an accredited advertising agency, cash should accompany all orders. Name and address must be included at foregoing rates. Minimum contract charge $1.00. All classified ads for the April issue must be sent in by February 25.

AGENTS WANTED PERSONAL

I AUTO GAS SAVER FREE To Introduce. Amazing car performa nce. Doubl es mil­ LON ELY HEARTS: Exchange letters ; make Interesting eage. CRITCH lOW. Inl/entor, C·90, Wheaton, Illinois. new friends In our jolly elub. Particulars free. EYa Moore, Box S08. JacksonYilie. Flor ida. AGENTS: Make $8 to S l ~ . Dail y. White Rose Polish. CONDENSERS. 800 VOLT FILTER, .1 mfd 45c, .25 Send SOe for full ~i2 e sample and partieulars. WHITE RHEU MATISM . NEURITI S-WH Y S UFFER ? Guar­ 5 Ic•. 5 60c. I. 75c, 2. $1.20, 3. $ 1.80, 4. $2.40, 1500 ROSE DISTRIBUTORS, Box 255 1. Memphis, T enn, a nteed compl ete t reatm .. nt ma il ed, postpaid $1. 50. Per- VOLT FI LT E R • . 1 Si c, .25 6D e. . 5 75c, I. $1.05, 2. 30ns Pronounced Incura ble should t ry. This Remedy gets SI.95, 3. 52.70. 4. $3.60. ELIMINATOR BLOCKS, 2. 2, WANTED, AN ACTIVE MAN TO TAKE ORDERS for you results or money refunded. Square ll ealing. Write a mi 8 $5.70. 2. 2. 8 il nd I S6. 15. 2, 2, 8, I and I Hardy fruit trees, berry bushes. evergreens, flowering PROF. GUHA, BOX R- 156. HUNTINGTON, IND. $6.60 •. 1 and .1 in series 90c. Many other capacities. shrubs and roses. Liberal commi ss ion. Free repl ace­ - . Acme transfftrmers and chokes. THE RAD IO CLUB, ment. Sales instruction and ou tfit free. Sherman INC., La Porte. Ind. Nursery Company. attention Mr. Smith, Charles City. Iowa. RADIO 3 element Rectlfler jars for B eliminators, B battery Build the Quadraformer Super VI. A real five tube set. chargers and transmitters. I jar lakes the place of 2 Genuine Essential Kit, 517.50 includi ng instruct ions. ordinary jars. V~" X ~4" 99.7%, pure alumi num. rubber AUTOMOBILE ACCESSORIES toyers bindIng posts 3" inside diameter $1.00 each, Booklet 25c. Literature on req uest. R. P. Toma mi chel, 4 for $3.00. prepaid to 5th lone. 112 cash with order FREE CIRCULAR INSTANT COLD WEATHER 2244 Seminary Ave nue, Chi cago. Illinois. balance C. O. D. Satisfaction or money back, George starting for Fftrd. Chevrolet and Star owners-Po O. S ehulz, Calumet, MICh. Bftll 1523-E. Denver, Colorado. Yo " square copp er wi re for lo w waye tra nsm itting I n­ ductance 3 or 4" dia meter co il s 5 a nd 6c per tur n pre­ Ultradyne-Model L2. Complete parts as specified by paid ~n ord ers for $ 1.00. Less than 5 1. 00 IOc extra for Lallault. including Cabinet a nd engrayed pa nel. Guar­ BOOKS AND MAGAZINES postage. GeorgI! Schulz. Calum et, Mi chiga n. anteed good as new. Cost $99.50. will sell for $60.00. Dftn.lld W. Church. Sterling. Ill inois. Electrie Fun! Seyenty stunts. 110 Yftlts. SI. Cec utt ln g. Campbell. Calif. TROUBLE-SHOOTING . Do yo u k now the key t o t he RADIO PANEL ENG RAVING: Single panels, quantity knowl edge of a ny electrIcal circuit? You can find cor­ work and special engraving of any description. Highest FREE-TWo big New Magazines and information worth r ect anS'II-"i!r In a bookl et written by nationally known sta ndards of wft rkmanshlp. We have served prominent hundreds d dOllars to you. Enelose 2c st amp. Sa les­ a uthorities on Radio a nd ElectriCity. Ask your rad io Radio Age experimenters and broadcast eng ineers for manager. BOX 74-R, Beayer Dam. Wi seons in. dealer for " Practical Guide for EYery Rad io Builder several years. A. L WOODY, Room 704, Ig South Wells a nd Owner" or Send 10c to· day to UniY ersal Test St .. Chicago. What could be better t han magazine subscript ions Equipment Co .. 2939 N. Oakley AVI!., Chleago. III. Sold for gllts. S end stamp for our special list of subscrip­ at a ll news stands In the city of Chicago. VICTOR E EN No. 170 sUperhehrodyne transformers S4.50 t ion bargains. Midland ProdUcts. Dept. R. A., 524 postpaid. Chelton 13 plate midget condensers $1.05 post. Courtland AVe., Park Ridge. Illinois. paid. L. W. Crosby, 19 Railroad Ayen ue, Swampscott, Buyers Sendee for Readers of Radio Age. I 11'111 buy Mass. Twentieth Century Book of Recei pts. Formulas a nd for YOU standard radi o merCha ndise If YOU cannot ob_ processes. an 807 cloth bftund book containing 10.000 t ain same in you r loca lity. Re mit list price of articles wanted. a nd If samc are not obtainable by me I will Tubes. all kinds. Incl uding latest power tub es at cut proven formulas for the manufacturer. work shop. labor­ prices a nd speeial discount. semi 2 cent stamp for prices atory. office and home. Sent prepaid upon receIpt of make refund. R. P. Tomamlchel . 2244 Semi nary Ave .. Chicago, Illinois. and particulars. Web Radio Com pany. Box 649. Chi­ $4.00. Send stamp for our 48 page catalog of l ate~t a nd cago. III., Dept. TE. best practical. scientific mechanical a nd Industrial books. Midland Products Co., Dept. RA. 524 Courtla nd Ave .• Park RIdge. III. Gu ara nteed t ubes, 199 and 20 lA types $1.00 each. $7.50 Eliminator parts 50H choke $2.00. 30H choke $1.75, unlls to make a loud speaker of your P honograph only 20H choke $1.00. Write for list of parts includ ing co n· $2.49. $4.00 list head phones going at $1.69. This Is densers and transformers. Postage prepaid. Ra lf io Parts BUSINESS OPPORTUNITIES real val ue, a standard make 3 tube set with long range Sales Company, Box 24, Orange, N. J. a nd lots of yo lume for $8.95, ( less accessories). while PECAN.Orange-Flg Groves "O!! the Gul f". Mon thly they last. $ 12.00 loud s peakers with genui ne Bakelite EURO P EAN Ilroadcast on two tubes. S imple and Bell at $6.95. Write for our prices before you buy your payments. Guaranteed care. Big. quick r ~turn s . Sub­ chfap to co'!stru~t. Blue pri!!ts SOc. Triangl e Draft_ urban Orchards. Dept. R. Biloxi. M ississip'pi. radio parts. Outlet S ales, 112 Calvert AYe., Detroit, Mi chigan. ing S eniee. 5 124 Sheridan Road, Chicago, I ll inois. CODE Saye UP to 50% on Nationally Adyertlsed Radio parts. RADIO TROUBLES OVE R. Hoff's trOUble fi nder 10 ' Send for our new price list of Rad io Kits, " B" ~ Iimln a_ cates. expl a ins Remedy. 103 radio a ilm ents. Particular! tors. Rad io Rcccivers and Parts. NATIONAL RADIO· DO YOU WANT TO MEMORIZE THE W IRELESS PRINT CO .• Room 404. 200 Broadway. Ncw York. TELEGRAPH CODE? THE CORYDON SN YDER CODE free. Smith. 516 Ma In , S t. John , N. B. METHOD IS EASIEST, QUICKEST. PATENTED. Send 10c coin for 'complete method to Corydon Snyder. Radio Panel lamp. Rests on top cabinet. Li ghts dials. ~~43 Rosemont Ayenue. Chicago, Illinois. IVORY RADIO PANEL beats t hem a ll . Wri t e for Uses batter y current. Co mpl ete with bulb $1.25, post­ FREE Sa mple. !woryl it e Radio Panel Co., 3330 Aye. G. paid. Satisfactory or mo ney back. Robert SteYenson, Fort Worth, Texas, Lancastcr. Ohio. COLLECTIONS Radio Books-Construction of a modern Super Hetero­ RADIO STAMPS Three Collection Letters That Actually Coll ect: Pro­ dyne Type Receiver Including Testing a nd Operation duct, 23 years' I!):.per lence. $ 1.75. Address J. A. Hills­ $1.00 ; Henley's 222 Radio Circuit Des igns. 267 pa ges, man, Lynchburg. Virginia. WAN TED-RadIo Station Stamp Collectors Everyw here. Write Chas. A. Phlldlus, 510 East 120th Street, New t l,!n 132 pageS ,[;5 Yo rk. N. Y. DOGS $1.00 ; The ABC i"s, iV~\'~'"j ,i"~m;:iT:~" lbf"~:;"~t;e~:d: ~' "l!iRt'::.d ~; '! ~Rb";~":g· 154 pa gliS $1.00. S ~ nt propa i d on r Q- BEAUTIFUL REGISTERED BULL PUPS $ 15. Bull ­ Send stamp for ou r 48 page catalog of SALESMEN WANTED dogs. 5 01 Rockwood, Dallas, Tuas. latest an best practica l, scientific, mechanical a nd In­ dustrial books. Midland Products Co., Dept. RA, 524 Make $100 W EEKLY In s pare t ime. Sell what the Courtland Ave. , Park Ridge, IllinOis. publ ic wants-long distaooe radio recelying sets. Two MISCELLANEOUS sa les weekly pays $ 100 profi t. No big Investment, no SILICON Transformer Steel cut to order .014". 10 Ibs. ca nYassing. Sharpe of Colorado made $9li5 in one FOR SALE: WATCHMAKER'S LATHE at a bargain. 25 cents.5Ibs. 30 cents. less than 5 Ib s. 35 cents per mo nth. RepresentatiYes wanted at once. This plan R. Jaellermann. 5~15 Easton Ave. , St. Louis. Mi ssouri. Ib .. 4 cubic inches to the lb.. 007" for rad io frequency is sweeping the country- write today before your county transformers, SOc cubic Inch, po s t a g ~ extra. At least 1,/2 is gone. OZARKA, I NC. , 43 1 N. LaSalle AYe., T. cash with order-balance C. O. D. Geo. Schult, Calu· Ch icago. HELP WANTED met. Michigan.

SET BUILDERS! We furnish jobs for you. ( No fee) 99.7% Pure aluminum for Rectlflers, B Eliminators, WANTED TO BUY eo".1petent men needed hday In eyery community to Trickle chargers and transmitters 1/2" round, l/~x l " bUild L<;-27 and Hamm31rlund-Roberts Sets. Bi g money rectangular 5c Inch, V. "x% 4c ineh. %" round lead Full value pa id for old GOLD jewelry, silver or plati­ elements 3112 " lang 15c, 7 for $ 1.00 all with bran ter _ num . Packa ges returned if aur offer not satisfactory. :~~uraor~, Ife:po~ri~~e , qUr~~I:~ence~~g~:r;n.NR~~;."gi~~ne~, ptls minals. prepaid to 5 lone. No order less than 5 1.00. Elaine Specialty Company. 3330 AY e. G. Fort Worth, E. 28th Street, New York, N. Y. Geo. Schull. Calumet, Michigan. Texas.

Radio Age Classified A ds B rin g Results

Please 111ention Radio AQe When 'Writing to AdvertiseTs. CROSLEY 1927 RADIOS E ....b sd giving the utmOllt in radio enjoyment at ita price. All pri

The 5-50-$50 Enthusiastic oWllers report amazing performullcc--e. drum ddivering stati().D.s loud, cioLl.l" and " barp: each an ahnCt:!t im. per«:ptiltle turn of the drum d:~: t!~ ~~ ~!"\;h ~~C~\~',! ~~ ...... - ....---- Single drum Station sclector. Aeuruu.atora. Dower tube adapt· ability aod all m etal eb8..$!<;'" that s hield!! tho unit'! ftom each other. Denutifully finished . .r.hholta.o.y cu.hlnet with rose gold trimmln~. Aho made with 6 tubes---6-aO--S60.

"6 Tube RFL-90" Console. $98, Introducing the double drum statiOn ~electorl Crosley'" win­ ning n().l1-oscillu.tillg perfectly balanced tuned radio IIOt. In­ clude.. Mu>

Sing~e Drum VV~J~\-I.V~ ;s -75 CONSOLE

THE CROSLEY MUSICONE The eccret, 01 the pOpularity of thb h!J(ge>lt Belling loud i~!:~~DOtin~:nin;~rki-th~~~d NOT the eone Bl'avo ill roo dC:°:r f~~ ~t~Jhl!e;:u~.rot~: ~\fARE of imitatioo8. 'lhero L., o.nly 0:'16 ;:enuine J\.fus ioonfl. It m huilt 60leiy by C.oole), $75. undor ma:s" prodUction m ethods r-,.·larvelou9 exclusive Crosley "Crescendon" and "'hlOh Inak~ it<.t uumatchable value Possible. "Acuminators" increase volu me on distant eta· tions and brin~ in pro¢l'ama entirely missed and passed by on ordinary one-dln.l control mdios. In this ,5.75 Console, Crosley aga.in brings to the radio public all the advanced ideas in radio at a price within the reach of all. Console model stands 40 inches high. The Crosley :Musicone is skillfully built into the cabinet. Ample space for batteries and all accessories. A mahol!:any cabinet with rose gold trimmings makes it possible to match the surroundings in any borne.

Cro~le/J I~l~ a.rll I ~cc,,~,d under Arm ,l~o'1 " U. S. Po.I. enl No. 6 tube model-The 6-85 1.113.149. or under palent np-­ spplicnhonlo/ Radio Fr(ql'cncu Labr>roJoriu , I nc., a.nd nll... r $85. 'P"!~nll iF~ I'cd nnd "("dtn,,. Write Dept. 63 Prius slightly higher West of Ihe Rocky Mou':/al'ns

and JI . l ntullilll: ~ THE SI NGLE-DlWl\I S'!'ATION IJI!:h J'owercd and 10(,,,1 8 FE"TURE8 ~ SELECTOn .. tutlOlliI they Uffl not Many ellclu ~ ive-otber w

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