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Radio Amateur News 15 Ak Cents OCTOBER 'AMATEUR 1919 RDIO OVER 100 ILLUSTRATIONS Edited by NEWSREG. U.S. PAT.OFF. H.GeJ nsback "The 100% Wireless Magazine" 111$ FIRS7' WI RZT,C 5 $ ME$SAGF,' ARC UNDAMPT TRANSMISSION RADIO PRIZE CONTEST AWARDS i In This By Ensign Pierre H. Bouchcron FUNDAMENTAL OPERATION OF VACUUM TUBES SELECTOR SWITCH FOR THE ROGERS ASS II l nnrinir1 QVc-rcnn .. e I v ?ro" LATER r www.americanradiohistory.comPUB,rmaL ST., N. Y. C "ASK ANYONE WHO ZIAS USED IT" SUBMARINED THREE TIMES AND STILL IN USE Said an Englishman: "I've been submarined three times -and put my Brandes Headset in my pocket each time. You request.) bet I saved it. I wouldn't have any other make." ( Naine on Think of the help to wireless operators, that the perfect sensitiveness and dependability of Brandes Headsets provided (luring the war. 1.ife and death depended upon hearing correctly. They are made today just the saine, and give the sanie quality of service. BRANDES CLEAR TONE WIRELESS LIGHT WEIGHT HEADSET DEPENDABLE SERVICE ".Superior" Sri -2000 ohms, V. Score 100% efficiency in actual use. Sharp, l-nblurred, Readable Signals assured by "BRANDES MATCHED TONE"- harmonics. Exactly matching the tone of both receivers in each set and thus eliminating all confusion due to unmatched come up to our claims Huy a Brandes Superior Headset and use it critically for ten days. Then, if it doesn't your expectations, return it and your money will be cheerfully refunded. Test it- compare it with others - or The two dia- TRIAL for sensitiveness, clearness, distance. Prove for yourself the fine quality, the "matched tone." phragms, toned exactly alike, strengthen the signals and prevent blurring. Used by many U. S. Government OFFER experts, and experts abroad; by colleges and technical schools; and by professionals and amateurs everywhere. SEND 4c FOR CATALOGUE "G" C. BRANDES, Inc., Room 823 32 Union Square, New York, U. S. A. WIRELESS RECEIVER SPECIALISTS This is a picture of a 15 panel Typical De Forest Unit Receiving Set consisting of a tuner with a wave length range of 150 to 25,000 meters, a crystal and audion detector and a one -step amplifier. Price of all the necessary units $133.57. You can buy any of these units separately, and make just the kind of set you want for any and all wave lengths of any preferred circuit and design, at a cost ranging from $30.00 and up. The tuning system is the most novel and efficient placed on the market. Designed and built for the De Use one receiver Forest audion and amplifier as only the makers of the audion can build it. f or all wave lengths at maximini efficiency. Type P -200 -2 -Step Audion Control Box type sufficient to in a Amplifier - P -100, combining give amplifications, up to 200 single compact set the Peer- times. The very latest in less 1)e Forest audion de- design - workmanship of tector, oscillator and audion the highest grade. Panel amplifier. No other instru- quickly removable making ment like it has ever been all parts accessible, and the built to sell for less than replacing of the new type $150.00. Our price without en block "B" batterit's but a Descrip- the bulb $65.00. work. Price with- tions of lower priced moment's models sent on application. out the bulbs $69.50. Wireless Manual and Catalog Mailed Upon Receipt of 10c to Cover Postage DE FOREST RADIO TEL. & TEL. CO., 1397 Sedgwick Ave., New York Ciiy You benefit by mentiontng the "Radio Amateur News" when writing to advertisers. www.americanradiohistory.com October, I9 I9 RADIO AMATEUR NEWS I 5 i AMPLIFY YOUR RADIO SIGNALS ONE of the greatest drawbacks since the invention TRANSMITTER herewith shown is two and three - of wireless telegraphy is the receiving of weak eighths inches in diameter, five -eighths of an inch thick signals at the receiving station. Many devices were and weighs less than three ounces. It is the most sensi- proposed to improve this condition, but without suc- tive sound detecting device ever brought before the cess, on account of the mechanical difficulties encoun- public. tered in these ampli- The manner in fying devices. which the amplifying However, this was process is attained is recently solved by the by attaching with tape introduction of an ex- the DETECTA- ceedingly sensitive mi- GRAPII - TRANS- crophone transmitter, MITTER to the reg- which is known to de- ular wireless receiver tect sound waves with as indicated in the great accuracy and diagram. magnify them through Practical Instrum ents for Commercial an intermediate tele- Other Uses phone circuit. and Scient ific. Purposes. Not only is this in- By the employment strument applicable of the new DETECTAGRAPH- TRANS- for amplifying radio signals, but it can be MITTER, the amateur can amplify the used with equal satisfaction for magnifying radio signals to such an intensity that he other sounds. Phonograph music can be can hear the signals about his station with- transmitted from one place to out the need of the telephone head set. another by means of this in- By the addition of a loud talking tele- strument, and those who are af- phone he is able to hear the messages many flicted with deafness will find feet away from the instrument. He is also enormous benefit by using this able to demonstrate the operation of his transmitter. Our Super -Sensitive It is the greatest device for build- wireless apparatus to his friends. Detectagraph Trans- mitter. Price, 58.00 ing your own loud talking tele- The super- sensitive DETECTAGRAPH- Complete phone, detectagraph and other de- vices. Adjusted Our Supper Sensitive loud to/Ring Can be Model "B" Horn, with high /Nicroµhone Tronrmi /er grade Loud Talking Re- / telephone I used for ceiver. Cord Plugs and Desk .r. as Stand Base any pur- Price. $l5.00 Complete p o s e Adjusted where a Model "C" /lead ref Horn, with Rhea/ot, sensi- high grade tive de- Loud Talking doHery tecting wall Receiver. instru- Price, ment is De/Valor Our Special No. 25 dui-Se/10/re loon Onm required. $15 000 Loud Talking Receiver Radio Te/e phone Receiver Price, 54.50 Complete Complete DETECTAGRAPHS FOR THE EXPERIMENTER FOR DETECTIVES FOR THE DEAF DETECTAGRAPH This detecting instrument of marvelous sen- Super Sensitive No. 40 sitivity can Receivers to be used in be used for detecting secret con- connection with Detect - versations. Outfit consists of Sensitive agraph Transmitters. Transmitter, 25 -ft. Black Cord, Receiver, Headband, Case and Battery. 1 8.122 $10.5° Complete ,OMM ra DETECTAGRAPH JUNIOR DEAF -PHONE The outfit consists of a Super- Sensitive C.o. It Transmitter, with a cord connector; Super - Detectagraph Rheostat, Co., 25 Church Sensitive St., N. Y. C. Ear Piece with small black cord ; especially made for am- Black Single Headband; Black Case and two plifying circuits. small Batteries. Transmitter 2Y8 inches in As per your ad in Complete '' Radio Amateur News. diameter, of an inch thick. d p 00 $2.9 please send me .free cur- and weighs less than three aP Order direct from ad. Or write for culars and full particulars ounces. O- free descriptive circular. For your about your Detectagraph De Complete convenience use the coupon. ' vices. G. BOISSONNAULT S, NAME COMPANY ADDRESS 25 CHURCH STREET NEW YORK CiTY CITY Makers of Super- Sensitive Microphone Devices ' e STATE You benefit by mentioning the "Radio Amateur News" when writing to advertisers. --- www.americanradiohistory.com 154 RADIO AMATEUR NEWS October, 1919 CONTENTS FOR OCTOBER PAGE PAGE "The Future of Radio" "Magnet Control for Vacuum Tubes" By H. Gernsback 157 By Herbert Webb 176 "Arc Undampt Transmission" "Design 'of the Leading Coil" By Ralph Langley 177 By Ensign P. H. Boucheron 158 "Copying Thru Static" "Latest Developments in Audio Frequency By Edgar Terrain Johnstone 177 Amplifiers" By Walter J. Henry 161 "A Wireless Telegraph Receiver" of the De "An Undampt Transmitter By Ray T. Foster 178 Forest Type" By E. Dynner 162 "Construction of Mica Receiving Con- "Government Control" " 164 densers" By L. R. Jewett 178 "An Exceptionally Well Designed One - "How to Make a Good Variable Con- half KW. Transmitter" denser" By A. Warr 179 By W. H. Priess 166 "A Radio Goniometer" 17S "W. C. G." By E. Dynner 167 By Edgar Terrain Johnstone "Improving the Rotary Gap" By C. H. Biron 180 Radio Contest. Award of Prizes. 168 "A Variable Grid Leak" Operation of Vacuum "Fundamental By Arno A. Kluge 180 Tubes" By David S. Brown 170 "New Radio Apparatus" 181 "Short Wave Receiving Transformer of Club Gossip 182 Novel Design " By Raymond Evans 172 Radio Digest 183 "Long Wave Receiving" With the Amateurs 184 By H. L. Beedenbender 173 "An Amateur's Retrospect" for the Rogers Under- "Selector Switch By Scott E. Vance 185 ground System ".By Stanley J. Brown 174 "Prize Contest." Award of Prizes 186 "Audios Protective Device" By E. T. Jones 175 "Junior Radio Course -Lesson Two" By E. T. Jones 188 "Cascade Amplification at Radio Fre- quencies" By Thomas Benson 176 "I Want to Know" 190 ._-^tttlovtclti\\t seasw._siiiiiiii-_..:«íl If;_-, the 26th of each month at Unaccepted contributions cannot be returned mima full postage has been RADIO AMATEUR NEWS U publiebt on for publication. New York. There are 12 numbers per year. Suheorlp Included. AIS. accepted contributions are paid on 283 Fulton Street, for novel experiments; accompanying a year In U. S. and Doeseeelona. Canada and foreign special rate U paid good photographe Uon price Is 31.50 them are highly desirable. countries, 32.00 a year.
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