Six inch bras gunners callipers, c 1770.

Six inch bras gunners callipers, c 1770.
2 9 c m
40cm
actual image size: 32cm x 21cm

Description

These callipers were used for measuring the diameter of cannon balls, or by crosing the arms, the bore of a cannon. They were made by Henry Gregory (fl 1750-1792), mathematical and navigational instrument maker.

© Science Museum / Science & Society Picture Library

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