Callipers by Thomas Wright, early 18th century.

Gunner's callipers, early 18th century.
Gunner's callipers by Thomas Wright, early 18th century. The callipers can be used as shown to measure the diameter of cannon balls, or with crossed arms to measure the bore of a cannon. The arms are inscribed with tables containing information relating to artillery.
 
Currently on display in:
Mathematics
Year made :
early 18th century
Inventory number :
1940-71
 

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