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Cole Military Sector

Cole Military Sector

Cole Military Sector
Humphrey Cole was one of the earliest practitioners of the art of making elements for technical computations for dialing, gauging and gunnery. He designed several ruled scales to make such measurements and calculations easier. These so-called military sectors each included two folding rules on which were engraved all the scales and calibrations needed by a master gunner. This device dates to 1575.