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serves were a terise of $100,000,00 circulati money high fct d i Ifypar of prey k $91.i0.000, and a ae of $2,265,000 in system dings of ' ^ government n "OARAC" COMPUTER "OARAC" is an electronic computer which has one of the largest "memories" yet incorporated in any computing device. A serial, decimal, single- address machine with magnetic tape input and output, it was built by the General Electric Company at Syracuse, N. Y., for use by the U. S. Air Force at its Flight Research Laboratory, Wright Air Development Center, Dayton, Ohio, in solving complex problems involving air- craft design, guided missiles and ballistics. The brain of the computer is a metallic drum (shown in photograph) which can hold pulses representing 10,000 ten - decimal numbers on its magnetized surface until the numbers are called into use. Operations can be performed upon instructions as well as on numbers. OARAC can make as many as 100 calculations per second. IRE TECHNICAL CONFERENCE On April 18 the only national IRE technical conference entirely devoted to television will be held in Cincinnati, Ohio. This is the Seventh Annual Spring Technical Conference, sponsored by the Cincinnati Section of the Institute of Radio Engineers. Subjects of the papers to be delivered include: "Television and the Bell System," "A High Powered UHF -TV Broadcast System," "The Design of TV Receivers Utilizing Non -Synchronous Power," "Approach to Mechanized Assembly of Electronic Equipment Applicable to TV Receivers," "The Selection and Amplification of UHF Television s ïash remun rtaih officers la HUll ran uauy. plan heretofore in effect pro - for the purchase of sigle pannuiti, Signals," and the latest developments in color television. COMPONENTS SYMPOSIUM The American Institute of Electrical Engineers, the Institute of Radio Engineers, the Radio -Television Manufacturers Association, and the West Coast Electronic Manufacturers Association are cooperating in the presentation of the 1953 Electronic Components Symposium to be held at the Shakespeare Club in Pasadena, Calif., on April 29, 30 and May 1. This symposium is one of a series of national meetings on electronic component parts being held annually for the purpose of bringing together all those who share an interest in the development, design, performance, and future of electronic component parts. MAGNETIC MEMORY UNIT Employing both electronic and new magnetic techniques, a fast -access memory unit which stores and releases numbers at the rate of 50,000 per second has been designed and constructed for the U. S. Army by the Research Division of Burroughs Adding Machine Company. Burroughs was commissioned to build the apparatus by the U. S. Army Ordnance Corps to speed the work of its electronic digital computer, ENIAC, in the Ballistics Research Lab- oratory at Aberdeen Proving Grounds, Maryland. ENIAC previously could "remember" a maximum of 20 numbers in its internal vacuum tube memory. The Burroughs unit, with a capacity of 100 numbers, is expected to increase EN- IAC's memory power six -fold. The heart of the new unit consists of 4100 individual memory cells, which are small doughnut- shaped cores of magnetic metal encased in plastic. TELEPHONE "RECOGNIZER" An electronic telephone device which can understand and intelligently react to spoken numbers has been built at Bell Telephone Laboratories. Named "Audrey," a contraction of "automatic digit recognizer," the special circuit automatically determines which of ten numbers, from "1" through "0," has been spoken into an ordinary telephone, and responds by flashing an appropriate light. When this device is adjusted for best performance with a particular speaker, it is said to operate with remarkable accuracy. The "recognizer" was the subject of a technical paper published in the January issue of the Journal of the Acoustical Society of America by K. H. Davis (shown in photograph) , R. Biddulph and S. Balashek, members of the Bell Laboratories technical staff who worked out its intricate details. ENGINEERS WANTED According to Mr. T. A. Marshall, Jr., executive secretary of the Engineering Manpower Commission of the Engineers' Joint Council, 40,000 jobs are waiting to be filled in the engineering profession today. At a press meeting held by The Advertising Council to introduce its new public service advertising drive for more engineering students, Mr. Marshall warned that the current engineering shortage was "critical" and "a threat to our national security." He explained that of the 23,000 new engineering graduates expected in 1953, the ROTC will take 6800, leaving 16,200 some for industry -which will need 30,000 a year for many years to come. The Advertising Council's campaign to help alleviate the shortage has been undertaken at the request of the Engineering Manpower Commission. b 8 e 20 RADIO -ELECTRONIC ENGINEERIN G APRIL, 1953
RCA N E E DS E NGI N E E RS who won't be held back! r- 0 .11k RCA, pioneer and leader in every important branch of radio -electronics, has a permanent position for you if you are an experienced ELECTRONIC. COMPUTER, ELECTRICAL, MECHANICAL OR COMMUNICATIONS ENGI- NEER . . . PHYSICIST ... METALLURGIST . . . PHYSICAL CHEMIST . . . GLASS ... \ rLASS TECHNOLOGIST. You may choose to specialize in research, development, design and application. Roth commercial and defense projects. POSITIONS OPEN IN RESEARCH - DEVELOPMENT- DESIGN- APPLICATION Circuitry -Antenna Design Servo Systems -- Information Display Systems --Gear Trains- Stable Elements - Intricate Mechanisms COMPUTERS - Digital and Analog -Systems Planning - Storage Technique -Circuitry - Servo Mechanisms Assembly Design High Speed Intricate Mechanisms COMMUNICATIONS - Microwave- Aviation -- Mobile --Specialized Military Systems MISSILE GUIDANCE - Systems Planning and Design Radar and Fire Control Servo Mechanisms Vibration and Shock Problems in any of the following fields: NAVIGATIONAL AIDS - Loran -Shoran -Altimeter, Airborne Radar TELEVISION DEVELOPMENT - Iteceivers- 'l'ransmitters and Studio Equipment COMPONENT - Transformer -Coil-Relay -Capacitor -Switch -Motor - Resistor ELECTRONIC TUBE DEVELOPMENT - Receiving- Transmitting -Cathode - Itay-Phototubes and Magnetrons ELECTRONIC EQUIPMENT FIELD ENGINEERS - Specialists for domestic and overseas assignment on military electronic communications and detection gear. There's not a temporary job among them. War or depression, RCA has continued to grow ... growth in which you'll share when you launch your lifetime RCA career. For many other reasons. tar, RCA is a good place for you to work. RCA affords unexcelled facilities in pleasant surround- ings ... every chance for advancement in rank and income ... enjoyable suburban or country living conditions ... professional recognition for achievement... modern retirement program. Many Company-paid benefits for you and the family. PIÁIS modern tuition -refund plan for advanced stud% at recognized universities. Personal interviews arranged in vur city. If you qualify for any of the positions listed above. please send us a complete resume of your education and experience. Please st n t e your specialized field preference. Send resume to: MR. ROBERT E. McOUISTON, Manager Specialized Employment Division, Dept. 204D, Radio Corporation of America, 30 Rockefeller Plaza, New York 20, N.Y. Vat RADIO CORPORATION of AMERICA APRIL, 1953 R A D I O - E L E C T R O N I C E N G I N E E R I N G 21
Page 1 and 2: T EVIS i N APRIL 1953 IN THIS ISSUE
Page 3 and 4: YOU PRACTICE COMMUNICATIONS with Ki
Page 5 and 6: I NOW...from D.T.I.s MILLION DOLLAR
Page 7 and 8: "I Read You Five." Welcome Words! H
Page 9 and 10: THE ONLY COMPLETE CATALOG FOR EVERY
Page 11 and 12: Get yourself on the beam to the BIG
Page 13 and 14: Look! New small size Adashaft Radio
Page 15 and 16: FETTER RECEPTION EVERY Ol oN 1111.
Page 17 and 18: A LOOK INSIDE PROVES WHY PAY A SERV
Page 19 and 20: TELEVISION RADAR ELECTRONICS RESEAR
Page 21 and 22: BETA RADIATION GAUGING METHODS By G
Page 23 and 24: would have in controlling the proce
Page 25 and 26: is done, the meter on the Microvolt
Page 27 and 28: I voltage regulation', '.'. as well
Page 29 and 30: DECAY CONSTANT IN VIBRATING SYSTEMS
Page 31 and 32: I I (5000), and Curie point* occurr
Page 33 and 34: COAXIAL CAVITY TUNING ELEMENT Fig.
Page 35 and 36: Make your U H F circuits as simple
Page 37: (// Capacitors shown 21 /7 times ac
Page 41 and 42: O N FREQUENCY CONTROL FOR MILITARY
Page 43 and 44: i Gpoßt i. NOW YOU CAN 4 pvRAVE ti
Page 45 and 46: known as the 5894 -A, because the c
Page 47 and 48: Ticnife "FILTER DESIGN DATA FOR COM
Page 49 and 50: Converter Calibration (Continued fr
Page 51 and 52: For opportunities within your reach
Page 53 and 54: Sweeping the Country! Collins Audio
Page 55 and 56: ULTRA FAN series-Complete VHF -UHF
Page 57 and 58: 1 029 Leonard C. Lane, B.S., M.A. ;
Page 59 and 60: A Transistor of point -contact type
Page 61 and 62: PH I LCO TESTERS Now Yours on NEW S
Page 63 and 64: Mriiffffifff(i ( l ((( THE RADIART
Page 65 and 66: TRAIN FASTER- TRAIN BETTER- TRAIN E
Page 67 and 68: A ROBOT ELECTRONIC TURTLE Closeup v
Page 69 and 70: 7. Solder to the ends of the Fa " s
Page 71 and 72: THE semi -automatic or "bug" key is
Page 73 and 74: ' even a small wooden box may be us
Page 75 and 76: Fig. 1. The compact, versatile mobi
Page 77 and 78: access to a surplus TU -10-B tuning
Page 79 and 80: CHANNELS Pertinent frequencies and
Page 81 and 82: quency definition probably wasn't n
Page 83 and 84: conicals are usually stacked two or
Page 85 and 86: THE U T SPEAKER ENCLOSURE Design de
Page 87 and 88: a drop of 6 db -per- octave above 5
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Fig. 1. (Left) Front panel view of
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Fig. 3. Bottom view of the 30-watt
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A LOWR[SISTA NCE OHMMETER _ By J. P
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By HAROLD HARRIS Vice -President, E
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erticle, the results are not too fa
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Sete/t SHORT -WAVE Compiled by KENN
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dual triodes with the necessary int
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You, ecutiAtea a &LtAufoP4Lo ctZ& b
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The data that Launched Thousands of
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Te MANUALS SHOW YOU HOW. Here is vi
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NEW WIDE BAND VERTICAL AMPLIFIE Dir
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Indicates frequency of energized ci
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NAL TRACER KIT OCATOR AND WATTMETER
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Mod.loied or nwdc kited RF output.
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SUPERHETERODYNE High gain dual iron
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H. D. Suesholtz, General Manager, T
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It will count events occurring eith
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1 EE101so Mc, MAIL YOUR ORDER TODAY
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Which Yo Want? Guet your FCC Ticket
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Code Practice Oscillator (Continued
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. =Ms or ...eel, u ' tically. topla
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1 II{ Phono Equalizers (Continued f
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1 BA" None None Top Top THE BEST IN
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What's New in Rac io (Continued fro
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59 .n 89 60 .89 54.95 . .69 . 1.59
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a noted 0630 with news, strong leve
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Clearly ' lia) Radio France -Asie,
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le in any variable power supply, no
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. SI9.95 \I e \ With 1 \I I.IB . 1.
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denser (Admiral par number 65B6 -26
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nllent 95 D.e.198 e B d. Adjust the
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Antenna Measurements (Continued fro
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impedance" and is an import ant con
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- 1 Junius Heard with news 0730 on
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allo is French session 0630 on 15.1
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v IlIllIllIlli IllIllIllIll
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NEW TV PRODUCTS On The Market "TELO
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entire u.h.f. band. A sin ;le switc
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layout charts and floor arrangement
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Fringe Antennas (Continued from pag
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a theater TV in the frequency spect
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Receiver Change s (Continued from p
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:nrh BF "BASIC ELECTRONIC TEST INST
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S0.62 f tical and easily- understoo
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B2 IT'S TERRIFIC! Fig. 3. Circuit t
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h' SGP1 7867 Within the Indust.), (
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VARIABLE PULSE LIGHT SOURCE HUNGER
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completely new system of closed con
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p ice businessman sells time, know
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It is apparent from the information
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1 -Improving Ir71 vision Technician
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i 2 Rate 50c per word. Minimum 10 w
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Assembling the components of Raythe
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