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Aviation History
1954
1954 - 1925.PDF
50 FLIGHT 25 JUNE 1954 PORTABLE MAGNETIC FLAW DETECTION is simplified and MADE EASY by means of this UNIQUE TOOL which can be applied to ANYTHING ANYWHERE and needs NO POWER SUPPLY World Patents Pending. R.P.R. PATENTS LTD., Alexandre Palae. Station London. N.I0 Telephone: TUDOR 2691 The Model 7 Universal ELECTRICAL TESTING INSTRUMENTS «19 : I IK. Size: 8 in. x 7£in. x 4Jin. Weight: 6f lbs. (including leads) AvoMeter The world's most widely used combina tion electrical measuring instrument. Provides 50 ranges of readings on a 5-inch hand-calibrated scale fitted with an anti-parallax mirror. Guaranteed accurate to B.S. first grade limits on D.C. and A.C. from 25 s/s to 2 Kc/tt. The meter will differentiate between A.C. and D.C. supply, the switching being electrically interlocked. The total resistance of the meter is 500,000 ohms. CURRENT: A.C. and D.C. 0 to 10 amps. VOLTAGE: A.C. and D.C. 0 to 1,000 volts. RESISTANCE: Up to 40 megohms. ' CAPACITY: 01 to 20**F. AUDIO-FREQUENCY POWER OUTPUT: 0—2 watts. DECIBELS: —2SJb. to WUDb. The instrument is self-contained, com pact and portable, simple to operate and almost impossible to damage electrically. It is protected by an automatic cut-out against damage through severe overload. Various accessories are available for extending the wide ranges of measure ments quoted above. • Write for fully descriptive pamphlet Sole Proprietors and Manufacturers:— AUTOMATIC COIL WINDER ft ELECTRICAL EQUIPMENT CO., LTD., WINDER HOUSE, DOUGLAS ST., LONDON. S.W.1. Telephone: V/Ctoria 3404-9 A7/6 A NEW edition of an ever -popular photographic handbook ... PHOTOGRAPHIC ENLARGING 3rd Edition By David Charles, F.R.P.S. This handy book describes in the simplest possible way the different types of enlarger and how they should be used. There is also much useful information on materials, accessories and the technique of making good enlargements. Of interest to all photographers, but particularly the amateur. 7 j in. by 5 in., 120 pp., 12 pp. plates. 6s. net By post 6s. 3d. By Arthur Nettleton, F.R.G.S. CASH FROM YOUR CAMERA 7j. 6d. ml By pail Is. Wd. Published for "Amateur Photographer" From booksellers, photographic dealers or direct from:— ILIFFE & SONS LTD., DORSET HOUSE, STAMFORD STREET, LONDON, S.E.I WAl 6) E* fi I/I* l.lllfilHMlLi * The most efficient in WASH**" #0* PAINT REMOVER economical and paint remover the world PAINT REMOVERS LTD 24. Ryder St St James. London S.W.I. TRAfalgar 4/6///fines/
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