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13884446
Wall Art and Photo Gifts from Mary Evans Picture Library
13884446
Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries
Media ID 32336682
© Aviation Ancestry
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VISUAL DESCRIPTION
This is an advertisement for the "Husun" Aperiodic Compass by Smiths, featuring two images of the compass from front and side views. The ad highlights that this instrument is part of a new range of Vertical Reading Aircraft Compasses. It describes the Type Ap. 737 (7/29) model, emphasizing its design which retains advantages of well-known Aperiodic systems while allowing for an adjustable magnifying prism to read the compass at eye level. The text explains that this particular model incorporates spherics (the magnetic elements are four projectors, numbered 0, 1, 2, and 3 spaced 100° apart with the exception of the 0 and 3 which are only separated by a distance corresponding to a direct reading across a fixed scale of approximately sixty degrees). These pointers can be directly viewed through illuminated windows in intervals. The compass is noted to be mounted on a special anti-vibrational suspension system and includes illumination by daylight from above. Dimensions provided include height: 6⅛ inches; width: 3½ inches; weight: only 28 ounces. At the bottom, there's information about Smith's Aircraft Instruments manufactured by A. Smith & Sons (Motor Accessories) Ltd. , along with their address at Bittacy Hill Church End Finchley London N. W. , branch addresses in Birmingham and Manchester as well as their head office located at Great Portland Street, London W1. The top portion features Smiths' logo with intertwined letters "SMP. "
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