Gunner's callipers, early 18th century.

Image number: 10302787

Gunner's callipers, early 18th century.

These callipers can be used to measure the diameter of cannon balls, or with crossed arms as shown here, 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.

Image number:
Science Museum/Science & Society Picture Library
Date taken:
12 January 2004 18:28
Image rights:
Science Museum

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