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Aviation History
1929
1929 - 0253.PDF
FEBRUARY 7, 1929 A New Cross Level Patented) Type Av. 724 (Mark VII). Range of scale from 20° Port to 20° Starboard. Made to Air Ministry Specification, which demands that the Cross Level shall function at temperatures from minus 60° to plus 60° Centigrade, and that during this range the size of the air bubble will not materially alter nor readily break under vibration. The size of the air bubble is adjustable. Illumination is provided by means of a small electric lamp, which produces a soft light over the whole range, enabling clear and immediate readings to be made. Length, 5f". Height, If". Fixing Hole Centres, 3^". Weight with 56" of flex, 5 ounces. S. SMITH & SONS (M.A.) LTD., AVIATION INSTRUMENT SPECIALISTS, SOLE EXPORT DISTRIBUTORS FOR K.L.G. SPARKING PLUGS. (Manufactured by The Robinhood Engineering Works, Ltd., Putney, S.W.) CRICKLEWOOD WORKS, LONDON, N.W.2. INCORPORATED BY ROYAL CHARTER Sav time by using the Air Mail. xi
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