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1 A. Finned Magnetron (Continued from page 176) IhiA4Tait A DAYSTROM "POT" The Model 300 -00- smallest, most ruggedly- accurate wire - wound potentiometer on the market! If you are having trouble finding the right "pot," a "pot" that will fit into the tiniest space, weigh less than an overstuffed feather, and still provide unexcelled accuracy -and resolution characteristics, you will want to know about the Model 300 -00 sub -miniature, wire -wound potentiometer produced by DAYSTROM POTENTIOMETER, and now improved even over the high -performance original. So SMALL and COMPACT it can easily be covered by a dime (3/16 inch thick). One half as large as its nearest competitor. So RUGGEDLY ACCURATE it can be used for the most exacting applications. High Power Rating Extremely Fine Resolution Operable Over Extreme Temperature Ranges Designed to stack (21 per cubic inch) The Model 300 -00 is just one of the many production or custom - made potentiometers available from DAYSTROM POTENTIOMETER. The Model 300 -00 and its big brother -the 303 -00 (higher resistance values) -are available out of stock. POTENTIOMETER DIVISION Openings exist for highly qualified engineers. complished by streamlining the fin at the exit. A set of the fins shown in Fig. 5 did result in an improvement, 27.5 cfm at 2.1 in. of water being required. The next attempt to increase the local h involved interrupting the flow over the fins by punchings and ribs. The effectiveness of the punching and ribs is largely due to their acting as a series of short plates with increased heat transfer coefficients due in turn to reduced boundary layer build -up. In designing these fins much attention was given to positioning the ribs and punchings so that the effect of the removal of metal on the heat conduction from anode to outer portions of the fins would be minimized. The fabrication of the fins with ribs and punchings is, of course, more costly than plain fins. The fin of Fig. 6 has punchings and ribs as shown and an assembly of these fins was quite effective, requiring 18 cfm and 2.2 in. of water. Since streamlining the exit and the addition of ribs and punchings were so effective individually, a combination, shown in Fig. 7, was tried. This reduced horsepower further, requiring only 18 cfm at 1.9 in. of water. A final thought was to put fins on the output pipe, as shown in Fig. 8. This would increase the heat transfer surface area on a part that is effective in transmitting heat from the anode. The idea was incorporated with the type of fin shown in Fig. 7. The result was an additional improvement, only 15 cfm at 1.8 in. of water being necessary to obtain the required hS value. The data for these various fin - configurations are summarized in Table I. It can be observed that the air -horsepower required to cool the magnetron was reduced by a factor of about 10 with careful cooling design. A Subsidiary of Doystrom Inc. p DCIII ECORPORATION 11150 La Grange Ave. West Los Angeles 25, Calif. Reference L. London, "Air- Coolers for Hicli Power Vacuum Tubes," Trans. of the IRE, Prof. Gp. on Electron Devices. Volume CD -1, No. 2. Apr., 1954. 178 For product information, use inquiry cord on pages 209 -210. Tele -Tech & ELECTRONIC INDUSTRIES June 1956
A combination ...for relaxation at Home Laminated plastics... a combination of properties at work It takes a combination of properties to satisfy many of your basic material requirements. Synthane laminated plastics provide a unique combination of mechanical, electrical and chemical properties plus ease of machining. Ag The circuit breaker bushing at left is an excellent example of a combination material used in combination. The bushing is made up of a solid copper bar to which is bonded a thick insulating shield of Synthane. In each bushing there is a thin copper grid wound into the insulating shield before curing. Subsequent machining exposes the grid for circuit contact. Synthane was chosen for this job because of its combination of high dielectric strength, toughness and machinability. COMPRESSIVE STRENGTH DIELECTRIC STRENGTH \ \\ irti 1. Property combinations! Synthane has them... in over 30 individual grades... sheets, rods, tubes, moldings and completely fabricated parts. Send for free illustrated catalog today. EASILY MACHINED WEAR RESISTANCE SYNThANE] S SYNTHANE CORPOATION, 11 RIVER ROAD, OAKS, PA. Tele -Tech & ELECTRONIC INDUSTRIES June 1956 For product information, use inquiry card on pages 209210. 179
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TELE-TECH & ELECTRONIC INDUSTRIES S
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-1081 One of the Publications Owned
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Facts and Figures Round -Up June, 1
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PROGRESS either of two other 50 -oh
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testing components with Burroughs p
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REPRESENTATIVES Mr. Bertram D. Aaro
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m perex all -glass GERMANIUM DIODES
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Electronics Around the World Contin
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2=====l: As We Go To Press... saam
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As We Go To Press .. . (Continued)
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. FIXED Composition RESISTORS In al
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As We Go To Press .. . (Continued)
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As We Go To Press (Continued) Airbo
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Atl\Iri Get on the a,Pr , rrlr^ì .
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MIT Offers Summer Program on Modern
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CAMERA PICK -UP TUBES FROM WESTINGH
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32 For product information, use inq
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1 CHOOSE YOUR 20 SERVO These high p
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Type ML-6A. This unit is identical
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i ru nSitron SILICON RECTIFIERS MIL
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Get an on- the -job demonstration o
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BON OFFERS MO HYPES OF 1% Here's 1%
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.... f HEREIT1F! A NEW Plug -In Tri
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Etched cathode FP plate for 85°C s
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-4-- 11 ---)(-- 11" copv.,A 41za--
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EIM 170 AC X600 Klystron covers -24
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NEW Size 8 servo combination rivals
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IF YOU USE COILS like these toroids
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UNION U Miniature Relays with the t
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Sqr2Jiex Coaxial Cal lé IS GOING P
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Precision Frequency Source... ULTRA
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BOOKS I PmenU Pending YLON CO /L FO
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WESTINGHOUSE 2 -AMP GERMANIUM POWER
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çStiiijh1hlw PRODUCTS 1-3 / "Co lo
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kes Tarzian R E C T I F E R S Selen
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B.F.Goodrich For duplicating free s
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7Teecej 40m744- &we114 7le4va7atL I
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Design made easy with reliable RESI
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NOW...G-E SERIES -STRING SMALL TV P
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Type J dual control with line switc
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EXTENDED LIFE ELECTROLYTIC CAPACITO
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I RADARSCOPE Revealing important de
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Protecting and Packaging Electronic
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Design Of By J. E. WOODWARD, Sectio
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TI MM PULSE DELAY VT ULM PULSE WIDT
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Ì Fig. l: System installation plan
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o. -.4111111..._ '1.2 i OE BELOW FR
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Air -conditioned 28 ft. truck house
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i fGqfq 0/ 100 NOE TUBES5 NO.OF OF
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\- SECONDARY ELECTRONS GUN ENLARGED
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fin Air Cooling A By DR. M. MARK Fi
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. -. ' _ 220° 210° 200 190° 170
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I Vo AC MILLI- VOLTMETER The maximu
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Fig. 1: Linear and circular instrum
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CONTROL VOLTAGE SI BAND SWITCH Inge
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MIRROR MOTOR , SCREEN TARGET SPOTS
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CUES for BROADCASTERS Practical way
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, Designed with the future 0 ° S C
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REOy NGLER Beamed at the Greatest R
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New Technical Products BATTERY CLIP
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New Technical Products S -BAND LOAD
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New Tubes & Semiconductors SILICON
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New Avionic Products TELEMETRY RECE
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New Broadcast Equipment AMPLIFI ERS
Page 130 and 131: 1/2 actual size ji HUGHES TRANSISTO
Page 132 and 133: 'ono/ ELECTRONIC SOURCES Investigat
Page 134 and 135: International ELECTRONIC SOURCES Pr
Page 136 and 137: permeability is defined. Temperatur
Page 138 and 139: International ELECTRONIC SOURCES Th
Page 140 and 141: International ELECTRONIC SOURCES re
Page 142 and 143: nal ELECTRONIC SOUR ES the emission
Page 144 and 145: HERE ARE THE FACTS ABOUT TV MICROWA
Page 146 and 147: WASHINGTON eetem Latest Radio and C
Page 148 and 149: the portable recorder you specified
Page 150 and 151: ELECTRONIC Test Instruments 9 TUBE
Page 152 and 153: cnor MAN "XC" Plastic Film Dielectr
Page 154 and 155: IS RIGHT "NEXT DOOR" IN TERMS OF SE
Page 156 and 157: WIDE -BAND POWER OSCILLATOR 200 to
Page 158 and 159: NEW FROM ASCOP LOW LEVEL PW MULTICO
Page 160 and 161: ffi NEW Printed Circuit Precision R
Page 162 and 163: Amplifier Design (Continued from pa
Page 164 and 165: HE PROVED IT FOR HIMSELF! The new P
Page 166 and 167: Albert Lazoni recently joined the D
Page 168 and 169: 1 1 DATA SOURCES Bil meti tsatäìr
Page 170 and 171: Be sure of dependable electrical pr
Page 172 and 173: DON'T DERATE DELIVERY DATES FOR CLO
Page 174 and 175: Here it is -the 1&/udc« Dat& on SI
Page 176 and 177: _ PROJECT: QUALITY CONTROL TARGET:
Page 178 and 179: Um OALOHM... ntiltiatune gut nw. Yo
Page 182 and 183: ASDE Radar (Continued from page 87)
Page 184 and 185: TWICE THE SPEED WITH DOUBLE LEAD SC
Page 186 and 187: for GUIDED MISSILES Encapsulated mu
Page 188 and 189: Regulation in less than '/so th cyc
Page 190 and 191: Color TV G/L/LI /L RADIO ® VACUUM
Page 192 and 193: What are YOUR paper tube reO requir
Page 194 and 195: F A Optical Radar EIMAC Vacuum Swit
Page 196 and 197: STANDARD True Hermetic Sealing assu
Page 198 and 199: Direction Finders (Continued from p
Page 200 and 201: 41611 DETERMINATION fleWiO//?pi of
Page 202 and 203: Direction Finders (Continued from p
Page 204 and 205: Here's the fastest way to produce f
Page 206 and 207: i Mobile Unit (Continued from page
Page 208 and 209: PROBLEM #3 Design a miniaturized 40
Page 210 and 211: FREED OFFERS FOR IMMEDIATE DELIVERY
Page 212 and 213: PRODUCT INFORMATION? Use the cards
Page 214 and 215: It would take over 500 listings in
Page 216 and 217: Product Section & Code No. Cable, o
Page 218 and 219: Product Section & Code No. Meters,
Page 220 and 221: 1956 ELECTRONIC INDUSTRIES DIRECTOR
Page 222 and 223: 2- AMPLIFIERS, RF -IF Amplifiers, a
Page 224 and 225: General Riveters Inc Electro Mechan
Page 226 and 227: Coleman Instruments 318 Madison St
Page 228 and 229: Superex Electronics Corp 4 Radford
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Mattson Electronics Corp 1487 Linco
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Instrument Labs 315 W Walton PI Chi
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11- CAPACITORS, Fixed Capacitors, a
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Chicago Tool & Eng'g Co 8383 S Chic
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Mount Sopris Instrument Corp 1320 P
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Daystrom Pacific Corp 3030 Nebraska
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Hudson Associates 50 Drumm St San F
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Tech Labs Inc Bergen & Edsall Blvd
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20- CONTROL EQUIPMENT, COMMUNICATIO
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Gyro Electronics Oo 325 Canal St Ne
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Fretco Inc 406 N Craig St Pittsburg
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Austin O Div of Decalmakers 225 Fla
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26- HEADPHONES Headphones, crystal
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Rust Industrial Co 41 E 42 St New Y
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Acme Wire Co 1250 Dixwell Ave New H
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Eberline Instrument Div Reynolds El
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Sonex Inc 245 Sansom St Upper Darby
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Synchroscopes 43 Thermocouples 44 T
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Librascope Inc 808 Western Ave Glen
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Sensitive Research Instrument Corp
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New London Instrument Co 82 Union S
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44- MICROPHONE ACCESSORIES Micropho
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Continental Electronics 302 Oakland
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Dalmo Victor Co Div Textron America
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Electronic Specialty Co 5121 San Fe
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Morrow Radio Mfg Co 2794 Market St
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Valpey Crystal Corp Holliston Mass
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Olympic Radio & TV Inc 34-01 38 Ave
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Raytheon Mfg Co Equip Marketing Div
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59- RECORDING ACCESSORIES Discs, bl
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Delco Radio Div General Motors 700
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Sage Electronics Corp 302 N Goodman
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65 -SOUND REPRODUCING EQUIPMENT, MA
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Jensen Mfg Co 6601 S Laramie Ave Ch
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Racks equipment 30 Racks, film stor
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Aerovox Corp & Divisions 740 Bellev
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Electronic Products Co 111 E 3 St M
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Midwest Electric Products Mankato M
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Hertner Electric Co 12690 Elmwood A
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Linde Air Products Co Div Union Car
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Guardian Electric Mfg Co 1621 W Wal
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Cranephone -Femco Inc. Crest Lab -M
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BRAND and TRADE NAME INDEX Polyken-
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CONSULTING ENGINEERS ELECTRONIC IND
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DISTRIBUTORS SERVING the ELECTRONIC
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REPRESENTATIVES ( "REPS ") ELECTRON
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REPRESENTATIVES ( "REPS'') DAN GREE
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REPRESENTATIVES ( "REPS") *Brauer &
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1 -7770 -5067 -4692 ALPHABETICAL LI
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-1677 -2291 -5127 -2626 ALPHABETICA
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-3130 Williams ALPHABETICAL LISTING
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-7765 1 -6174 ALPHABETICAL LISTING
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ALPHABETICAL LISTING of MANUFACTURE
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-1060 ALPHABETICAL LISTING of MANUF
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-2700 -8454 -C I-Leo ALPHABETICAL L
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000 Directory -Localizer Index Unit
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THE H. CROSS CO. ROLLING TECHNIQUE
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BIRNBACH can supply ... Single -Gun
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high 0 MICROWAVE SPECIFICATION IS I
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WE MAKE THE KIND OF TRANSFORMERS YO
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ä EXTENDED FREQUENCY RANGE with th
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plastic molding INJECTION 20 machin
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Nom! A LOW COST BRIGHT RHODIUM PLAT
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PRECISION ENGRAVING on Metal- Plast
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1199 IRE (LOT d IMAM pIEt ..e.. u..
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IMPEDANCE COMPARATOR FOR LABORATORY
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ADVERTISERS in JUNE Tele -Tech ACME
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ELECTRICAL WIRING DEVICES Designed
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RCA Field Enginee RCA Application E
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