Six inch brass gunners callipers, c 1770.
Image number: 10302788
These callipers were used for measuring the diameter of cannon balls, or by crossing the arms, the bore of a cannon. They were made by Henry Gregory (fl 1750-1792), mathematical and navigational instrument maker.
- Image number:
- Science Museum/Science & Society Picture Library
- Date taken:
- 20 October 2003 13:36
- Image rights:
- Science Museum