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Gunner's callipers, early 18th century.

Hills, Jennie

Gunner's callipers, early 18th century.
3 4 c m
actual image size: 32cm x 26cm


These callipers can be used to measure the diameter of cannon balls or, with crosed arms, to measure the bore of a cannon. The arms are inscribed with tables containing information relating to artillery. The instrument was made by Thomas Wright (d 1767), who styled himself mathematical instrument maker to George, Prince of Wales, in 1718.

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© Science Museum / Science & Society Picture Library

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