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4 with which is combined `the Wireless Age Edited by KENDALL BANNING Opedistisr WO pages ofiniacticaliusefta and alagtotitativeinformaeon for the Itpdio Antatestr and the Ilvoadcast Listener www.americanradiohistory.com It's a genuine Ii V-201-A, only when it bears the name Radiotron and the RCA mar WD -11, WD -12, UV-199, UV -200, and UV-201-A are the type names of Radio. trons. They belong to Radiotrons only. To be sure you are buying the genuine, look for the name Radiotron and the RCA mark on the base. Then you are sure of quality. Radio Corporation of America Chicago New York San Francisco atO.. V. s. : PAT. OFF. adiotron AN RCA PRODUCT www.americanradiohistory.com The Best in Radio Equipment Adjustable. $1 a. The Brandes Speaker -Type H -a simple, attractive quality horn with a smart antique finish. c//co ustics Brandes ACOUSTICS is the science of markable new speakers by sound. Radio acoustics is Brandes, has dawned an epoch of the science of transforming elec- Brandes acoustics built into bet- trical impulses into audible sound ter radio sets. -the new and absorbing study So, whether you buy a set and a of real reproduction of voice speaker or a set with a self -con- and music. And in this field tained speaker, insist on "Acous- Brandes have been pioneers since tics by Brandes" and be assured of 1908. finest tone quality and uniformly era of re- good reproduction. Tlu Brand, s adjust- Today, along with an ahleTahle- Talker with the gooseneck hunt. Brandes-experts in s 10. Brandes Cabinet Speaker of mahogany in the popular brown finish. Same tone quality and volume as Type H Speaker. Ad- radio acoustics since igo8 justable $30 The Superior Matched Tone The new btionograph at- Headset to tune in with. To tachment - same unit as listen undisturbed -and undis- Type H Speaker. Adjust- turbing ..... $4.50. able. , $10. Prices slightly more west of the Rockies and in Canada. © Copyrighted by Brandes Products Corporation, 1925. All apparatus advertised in this n-agazine has leen tested and approved by POPULAR RADIO LABOR Al Olt V www.americanradiohistory.com POPULAR RADIO WITH WHICH IS COMBINED "THE WIRELESS AGE" EDITED by KENDALL BANNING FOUNDED 1911 CONTENTS for SEPTEMBER, 1925 VOLUME (('ozvr design by Frank B. Masters) VIII NUMBER 3 The Nlan Who First Found a Use fur Ionization in Radio FRONTISPIECE Ilow the Air Affects Radio E E Free . Page 199 How Radio Dead-spots are Found by a Wandering Broadcasting Station / O. Perrine 207 When You 'rum Your Dials. Jacques Avon 212 \Ien Who Made . 218 gth I nstallincnt Useful Charts for Amateurs t. Todd, Jr. 221 Simple -How-to-Build- Articles for Beginners Laurence M. Cockaday.. 227 Ni). 11 : An Antli0-frequency Anudnier fr AC The At( nu Bragg 232 .1rtiile Nio. 2: The Nature iif (ial...... The Diary of a Radio Fan 1) R. Patterson 237 Ilandv Tools fur Radio Fans 239 Nii. 0: The lackknift. "What Set Shall I Buy ' Thc Tcchn ica/ tat T 240 4th 111st:dime-lit I roW to Cret the NI, )st Out i if Yi )ur Read v-inade Receiver (;ordc),: Taylor 244 \. The Freed-Pisumann Nuutr,n1\ fly Call Letters That I lave a Past .. ..LwaTence .4. Corridon 255 Riding to Riches by Radio.. .. Ralph E. Renaud 256 Part 11 Listening liorn to Det,ct Aircraft 261 DLI,ARTNIENTs In the Exper-j.menter's Laboratory The Technical /aft. 262 'rite Broadcast Listener Raymond Francis l'ates.. 272 What's New in Radio Apparatus The Technical S'talf 276 In the World's Lai)oratories E E. Free 280 What Readers Ask Laurence M. Cockaday... 288 Broadcasts J Andrew ll'hite 294 \ Loa. \ Ill SEPTEMBER, 1925 NUMBER 3 tox Popular Radio, Inc., (27 \Vest 43rd St., New York. N. Y.. telephone num- . Chickeling I91ir,: Douglas IL Cooke. President and Treasurer; Kendall Banning, Vice-Pres- ident; Eatrence M. Cockaday, Secretary; Joseph T. Cooney. Asst. Treasurer. Price 25 cents a copy; subscription $3.00 a year in the U. S., Canada and all countries within the domestic postal zon,-; else%s here .$3.50 a Year, payable in advance. The International News Company, Ltd., No. 5 Bream's Bldg., London. E. C. 4, sole distributors in England. Entered as second class mat- ter April 7, 1922, at the Post Office at New York. N. Y.. under the act of March 3, 1879. Copy- right, 1)25, and title registered as a trade-mark by Popular Radio, Inc. Copyright in Great Britain by Popular Radio, Inc.. 6 Henrietta St., Covent Garden, W. C., London, England. Printed in U. S. A. LAURENCE M. COCK.ADAY. Technical Editor E. F. 1.10,21-2. Ph.D.. Contributin.4 Editor JOHN \. L. HOGAN. Contributing Editor For advertising rotes aiiress E. R. CROWS & COMPANY, INC. New York: 25 Vanderbilt Avenue Chicago: 225 North Michigan Avenue 2 www.americanradiohistory.com Ti.e Best in Radio Equipment Again Grebe steps Another exclusive Grebe feature. One dial can oper- will. ate all three -or they can be set separately at ahead -- 1 The Sync Yli]®p>lasc now ;.1s One, Tw ll ®r Thmee,dial Contrci THE three condensers operate from one dial -or SLF separately at will. This first real, flexible form Condenser of " unit- control " marks another milestone on the road of Grebe leadership. The new Synchrophase has the same Binocular Coils which give that unusual "selective sensitivity" so universally prized; the same Straight- Line -Fre- quency Condensers that make accurate tuning easy. Ask your dealer to demonstrate; then compare A. H. Grebe & Co., Inc., Van Wyck Blvd., Richmond Hill, N. Y. New York Office: Steinway Hall, 109 West 57th Street Western Branch: 443 So. San Pedro Street, Los Angeles, Cal. This company owns and op.., ate.; stations WAHG and WBOQ: also mobile and marine loti REB wave rebroadcasting station,. J.k TRFtill: MARK I wis- 40,rr:soe nrs "Get rid of smell dom end great wisdom will shine upon you." Grebe appa- Chuang Tzu All ratus is covered It Is great wisdom to by patents grant- buy the Synchrophose ed and pending. (i3t«$i Synchrophasc is also supplied with base for batteries LABORATORY All apparatus advertised in this magazine has teen t-ested and approved by POPULAR RADIO www.americanradiohistory.com PAGES WITH THE EDITOR Radio Corporation ut America "NO COMBINATION COULD BE MORE IDEAL TION TH. \ \' THE COMBINA- OF THE WIRELESS AGE WITH POP('LAR RADIO" ft'ith this issue THE WIRELESS AGE, the oldest radio magazine in the United States, is consolidated with POPULAR RADIO. Cllr. J. Andrew White, for ten years the Popular editor of THE WIRELESS AGE and known the country, to radio fans throughout takes this occasion to welcome his former readers growing army of readers to the large and of POPCL \R RADIO. The Editor takes pleasure in calling upon his friend lIr. 1f'hite for a few remarks! The Dean 's Declamation ALTHOUGH the surroundings are unfa- as often as we would have liked miliar, looking up from this page to; but as years into rolled by and the same familiar names kept the eyes of old friends gives me the comfort- repeating themselves able feeling on the subscription lists of having strayed into the hearth - there was no resisting side circle after being far the feeling that we were afield for a time. welded into one large but never cumbersome If home is where the heart is, then I have family. never gone away ; for nothing is dearer in the memories I have stored up than the many AND now this move into a new community, happy years when it was my good fortune to where there will be more room for the growth guide and govern feeble footsteps into radio of the true ideals and high purposes that served for a host of loyal followers of that brave little so well in cottage days and made the mansion pioneer publication, The Wireless Age. possible. * * * GOOD neighbors, these POPULAR RADIO folk! IT is a very easy thing to be sentimental They looked like it about old at the beginning and they associations, and it doesn't embarrass have proved it since. A happy me a bit to say that on an occasion culmination like this of the romance in radio, that is the there is no little emotion welling up way I within see it ; the words consolidation and combina- me. tion seem too * * * cold. As an Editor, there were thousands among POPULAR RADIO and The Wireless Age have my readers I counted as my friends. We wrote always had so much in common, to each interests and other, we met occasionally ; neither, (Continued on page 6) 4 www.americanradiohistory.com The Best in Radio Equipment Heavy Low end clips for resistance permanent foil capacity Tested / Tinned India solderin ruby lugs mica Eyelet Natural for screw canvas mounting Bakelite What makes for efficiency in fixed condensers? This diagram indicates the efficient details of construction that have made Micadons the standard* fixed condensers of radio. Dubilier engineers have developed these stand- ard condensers of accurate and permanent capacity. Micadons are known the world over -and are used in 90% of all radio sets. *Standard-anything recognized as correct by common consent . of a high degree of excellence.- Webster DubilierAND RADIO CORPORATION CONDENSER LABORATORY All apparatus advertised in this magazine has been tested and approved by POPULAR RADIO www.americanradiohistory.com PAGES WITH THE EDITOR (Continued from page 4) aims identical - I simply can't picture their If you are in Atlanta coining together in the light just let me know and I of anything as xvill try to show you a good time." stiff and formal as is suggested by the phrase, -MORRIS DORSEY, Atlanta, Ga.