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  • ADIO AMATEUR. NEWS

    REG. U.S. PAT.OFF.

    -The 100% Wireless Magazine"

    GRAND OPERA BY WIRELESS

    See Page 100

    15 Cent's SEPTEMBER

    1919 OVER 100

    IL LUSTRATIONS Edited by

    H.Gernsback

    In This s s.0 e:

    REVIEWING RADIO HISTORY By Dr. Lee de Forest

    FUNDAMENTAL OPERATION OF VACUUM TUBES By David S. Brown

    GRAND OPERA BY WIRELESS By H. Gernsback

    GUARDING THE ETHER DURING THE WAR By P. H. Boucheron

    vt It MN U'BLISHED BY EXPERIMENTER PUBLISHING qtr., ., N. Y. C. www.americanradiohistory.comwww.americanradiohistory.com

    www.americanradiohistory.com

  • "ASK ANYONE WHO HAS USED IT"

    WENT THROUGH CHATEAU -THIERRY, ARGONNE AND MEUSE OFFENSIVES A soldier who used a Brandes Headset all through the war brought it to us for slight repairs afterward. He knows that a Brandes is the best that can possibly be made. You ought to hear him talk. (Name on request.)

    BRANDES

    WIRELESS

    HEADSETS

    TRIAL OFFER

    CLEAR TONE

    LIGHT WEIGHT

    DEPENDABLE SERVICE

    "Suprrinr" Set- 20(X) nhms. $L Score l00% efficiency in actual use

    Sharp, Unblurred, Readable Signals assured by BRANDES MATCHED TONE" -

    Exactly matching the tone of both receivers in each set and thus eliminating all confusion due to unmatched harmonics.

    lirandes Wireless Headset sent to you on trial for 10 days. Test it,- compare it with others, -for sensitiveness, clearness, distance. Prove for yourself the fine quality, the "matched tone." The two diaphrams, toned exactly alike, strengthen the signals and prevent blurring. Used by many U. S. Government experts, and experts abroad; by colleges and technical schools; and by professionals and amateurs everywhere If dissatisfied, your money back without a question.

    SEND 4o FOR CATALOGUE "G..

    C. BRANDES, Inc., Room 823 32 Union Square, New York, U. S. A. WIRELESS RECEIVER SPECIALISTS

    AMAZING AUDION DETECTOR

    VALUES- $9.5 -0 $11.75 $18.85 $22. (22

    Remarkably efficient and handsome audion control panels within the price limit of EVERY AMATEUR, BUILT AND DESIGNED FOR THE AUDION, AS ONLY THE MAKERS OF THE AUDION CAN BUILD IT. IN THE PAST, INSTRUMENTS OF THIS CALIBRE HAVE NEVER

    BEEN OFFERED AT TWICE THESE PRICES. GENERAL SPECIFICATIONS, ALL MODELS: Beautifully engraved and grained genuine bakelite panels; 4 prong heavy nickeled tube receptacles; smooth running, positive acting, adjustable rheostats; impregnated efficient mica stopping condensers;

    adjustable or fixed grid leaks with polished nickel covers; bakelite covered binding posts with new slotted positive

    :I connecting feature: positive segmentally connected nickel plated switches; 40 volt B battery of two 20 volt type units cast en block with operating life of 6 to 12 months - a remarkable advance in B batteries; handsome quartered oak cabinets, round corners. standard de Forest "Early English" finish; perfect workmanship and expensive design throughout. Type P -400 Audion Panel -Consists of tube receptacle, grid leak and condenser, rheostat and binding post for connection to tuner, A and B batteries on bakelite panel 71/2" x 71/2" without cabinet and B batteries $9.50 Type P -401 Audion Panel -Same as above with cabine,

    $11.75 Type P -402 Audion Panel- Larger panel with 40 volt B battery in cabinet $18.85 Type P -500 Audion -Ultraudion Panel -Type P402, Panel

    P500- $22.00 with two switches for audion -ultraudion connection and

    either 20 or 40 volt B battery in cabinet $22.00 TYPE P401- $11.75 NOTE: All de Forest audion apparatus is sold without the tubes. Audion detector oscillator or amplifier tubes, $7.00 each additional.

    Catalog sent on receipt of I Oc in stamps to cover postage.

    TYPE

    DE FOREST RADIO TEL. & TEL. CO., 1397 Sedgwick Avenue, New York City

    www.americanradiohistory.comwww.americanradiohistory.com

    www.americanradiohistory.com

  • September, 19 19 RADIO AMATEUR NEWS 97

    AMPLIFY YOUR RADIO SIGNALS O NE of the greatest drawbacks since the invention of wireless telegraphy is the receiving of weak signals at the receiving station. Many devices were proposed to improve this condition, but without suc- cess, on account of the mechanical difficulties encoun- tered in these ampli- fying devices.

    However, this was recently solved by the introduction of an ex- ceedingly sensitive mi- crophone transmitter, which is known to de- tect sound waves with great accuracy and magnify them through an intermediate tele- phone circuit.

    By the employment of the new DETECTAGRAPH- TRANS- MITTER, the amateur can amplify the radio signals to such an intensity that he can hear the signals about his station with- out the need of the telephone head set.

    By the addition of a loud talking tele- phone he is able to hear the messages many feet away from the instrument. He is also able to demonstrate the operation of his wireless apparatus to his friends.

    The super- sensitive DETECTAGRAPH-

    TRANSMITTER herewith shown is two and three - eighths inches in diameter, five -eighths of an inch thick and weighs less than three ounces. It is the most sensi- tive sound detecting device ever brought before the public.

    Practical Instruments for Commercial and Scientific Purposes.

    Our Special No. 25 Loud Talking Receiver Price, $4.00 Complete

    A

    LC

    Our Super -Sensitive Detectagraph Trans- mitter. Price, $7.00

    Complete

    Our Jup erSens / /ive /,Niccophone Troesmi / /er

    The manner in which the amplifying process is attained is by attaching with tape the DETECTA- GRAPH - TRANS- MITTER to the reg- ular wireless receiver as indicated in the diagram.

    Other Uses Not only is this in-

    strument applicable for amplifying radio signals, but it can be used with equal satisfaction for magnifying other sounds. Phonograph music can be transmitted from one place to another by means of this in- strument, and those who are af- flicted with deafness will find enormous benefit by using this transmitter.

    It is the greatest device for build- ing your own loud talking tele- phone, detectagraph and other de-

    v i c e s. Can be used for any pur- Prl... $10.00 Coerlets p o s e where a sen s i- tive de- tecting instru- ment is required.

    Loud to /hing telephone

    Me sJ

    Item/ set,

    Detector

    i i Our Sensitive woo Ohm Radio Telephone Recover

    Rheas/o9;

    gallery

    Medal "B" Hors, with Loud Talkies Reo.lver, Cord Plugs

    and Desk Stand

    s

    DETECTAGRAPHS

    Model "C" Horn, with Loud Talking Wall Receiver. Price,

    $10.00 Complete

    FOR THE EXPERIMENTER FOR DETECTIVES FOR THE DEAF

    DETECTAGRAPH This detecting instrument of marvelous sen- sitivity can be used for detecting secret con- versations. Outfit consists of Sensitive Transmitter, 25 -ft. Black Cord, Receiver, Headband, Case and Battery. Complete DETECTAGRAPH JUNIOR DEAF -PHONE The outfit consists of a Super- Sensitive Transmitter, with a cord connector; Super - Sensitive Ear Piece with small black cord; Black Single Headband; Black Case and two small Batteries. Transmitter 24 inches in diameter, 3á of an inch thick. C 00 and weighs less than three J.- ounces. Complete

    Detectagraph Rheostat. especially mode for am- plifying circuits.

    $2.00 Complete

    Super Sensitive No. 40 Receivers to be used In connection with Detect- agraph Transmitters.

    $10.°° .6_ .... Boissonnault Co., 25 Church ' St., N. Y. C.

    de As per your ad in Radio Amateur News.

    please send me free cir. Order direct from ad. Or unit. for culars and full particulars free descriptive circular. For your 4, Imes. aeout your Detectagraph De convenience use the coupon.

    BOISSONNAULT COMPANY 25 CHURCH STREET NEW YORK CITY

    Makers of Super -Sensitive Microphone Devices

    NAME

    ADDRESS

    CITY

    ' STATE You hrn rfit by mentioning the "Radio Amateur N etas" wJ, ro writing to advertisers.

    www.americanradiohistory.comwww.americanradiohistory.com

    www.americanradiohistory.com

  • 98

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    RADIO AMATEUR NEWS September, I 9 I 9

    CONTENTS PAGE

    "Government Radio Control Once More." By H. Gernsback 101

    "Reviewing American Radio History" By Lee De Forest, Ph.D., D.S.C. 102

    "Guarding the Ether During the War" By P. H. Boticheron 104

    "Static Eliminator of Considerable Merit" By Edgar Terrain Johnstone 105

    "Grand Opera by Wireless" By H. Gernsback 106

    "Government Radio Control" 108 "5 -Kw. Navy Transmitter"

    By W. H. Priess 110 Coast Artillery Radio School 109 "The Pickard Double -Deck Receiver"

    By Walter J. Henry 112

    "A. B. C. of Wireless Reception" By H. K. Dunn 113

    "Fundamental Operation of Vacuum Tubes"

    By David S. Brown 114

    "The Latest Design in Antenna Switches" By E. T. Jones 116

    "Construction of An Audion 'B' Storage Battery"

    By Herbert Webb 117 "Some Real Ideas"

    By Zip 118

    "Moulded Condensers for the Amateur" By L. A. Bartholomew 119

    "A Radio Experimenter's Re