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13884455
Wall Art and Photo Gifts from Mary Evans Picture Library
13884455
Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries
Media ID 32336724
© Aviation Ancestry
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VISUAL DESCRIPTION
This is an advertisement for the "Bygrave" Position-Line Slide Rule, manufactured by Smith's Aircraft Instruments. The ad highlights that this instrument allows for the complete reduction of a sight without any reference book other than the abridged Nautical Almanac. It describes the slide rule as consisting of two cylinders sliding with reference to each other, one inside another, featuring printed scales, log tangents, and a spiral scale divided into minutes or arc throughout its length. The outer scale is graduated with log cosines and includes full instructions for dealing with all possible cases on the back of the bottom of the cylinder. Scales for declination refraction, moon's parallax and converting time into angle are also provided. The dimensions given are 9 inches high and 2½ inches in diameter while weighing less than 2 lbs. , indicating its portability. The image shows both a detailed illustration of this cylindrical slide rule along with wings symbolizing aviation at the top and information about Smith's Aircraft Instruments including their address at Great Portland Street, London below. The advertisement reflects early-mid 20th-century graphic design styles commonly found in technical equipment marketing materials from that era.
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