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Aviation History
1954
1954 - 0638.PDF
20 FLIGHT 12 MARCH 1954 CYCLIC SWITCH This unit is designed to switch A.C. current to a cyclic series of 32 de-icing installations on aircraft surfaces. In response to a J second pulse of D.C current at 24 volts from an external timing device such as an intervalometer, it breaks circuit with one installation and makes the next bank of contacts in the series. It is capable of handling power supplies of up to 4.5 kilowatts, 400 cycles, three phase A.C. at 208 volts. The A.C. contactor mechanism embodies an arrester device which gives accurate positioning of the distributor contacts. All D.C. contacts are protected by spark quenching circuits. SPECIFICATION Operating Conditions -45 C. to + 70 C. Vibration Acceleration Weight Connections Voltage To BSS G. 100 To BSS G. 100 I3j lbs. From intervalometer—5 pin climatic proof breeze plug. From A.C. supply— 4-pin climatic proof breeze plug. Operating—24 volts D.C. (nominal). Load 4.5 k.V.A. at 208 volts, 400 cycle, three phase A.C. Operative D.C. pulse : second. TEDDLNGTON CONTROLS LTD., CEFN COED, MERTHYR TYDFIL, SOUTH WALES (Merthyr Tydfil 666) AUTOMATIC CONTROLS YOUR complete guide to all that is I needed for the new season's motoring SPRING AND TOURING NUMBER Now is the time to prepare for the long, motoring days ahead. The AUTOCAR'S Spring and Touring number tells you how to select and get the best out of your car, surveys the many extra items of equipment available, and includes much helpful information on touring and caravanning. This issue, which was very popular before the war, will be of great interest to both newcomers and seasoned car owners. Out TO-DAY ELIFFE & SONS LIMITED from your newsagent lS« DORSET HOUSE STAMFORD STREET, LONDON, S.E.I
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