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Aviation History
1935
1935 - 1573.PDF
JUNE 27, 1935. ADVERTISEMENTS. FLIGHT. SUPPLEMENT i. COMPUTER HEIGHT AND AIR SPEED MARK I Our Type Av. 884 The majority of computers designed to correct the readings of the airspeed indicator for density, and of the altimeter for air temperature are bassd on some conventional relationship between height, pressure, air temperature and, therefore, density, and none has previously combined the function of height and airspeed computer in one compact instrument. The instrument put forward is one of the most useful aids to accurate navigation during medium and long distance flights which has yet been devised. It can be screwed to the navigator's chart board or, in single-seater aircraft, in some position convenient to the pilot, or alternatively it may be used in the hands. Mechanically the computer is very simple, and consists of three links which are sat to the variable quantities, namely, ground barometric pressure, height as indicated on an isothermally calibrated altimeter, and air temperature as measured at that height by means of a strut or transmitting type of air temperature thermometer. The effect of these settings is to move into the correct position two pairs of pointers, one for indicated and corrected height, and the other for indicated and corrected air speed. Underneath these pointers a disc is arranged which carries on its edge a logarithmic scale. This scale is set to the indicated pointer and read by the corrected pointer using the relevant pairs of pointers. The instrument is constructed in duralumin with anodised finish, subsequently treated with transparent lacquer. Each is packed in a polished hardwood box containing instructions for the use of the instrument. The approximate weight is 6 ozs., and overall diameter 5fin. SMITHS 1 Kindly mention "Flight" when corresponding with advertisers.
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