Callipers by H.gregory, c.1770

Six inch brass gunners callipers, c 1770.
Gunners callipers, 6 inch by H.Gregory, brass 18th century. These callipers ere used for measuring the diameter of cannon balls, or by crossing the arms, the bore of a cannon..
 
Currently on display in:
Mathematics
Year made :
1744-1800
Inventory number :
1919-3