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Gunners' calipers

Date: c 1790
Overall: 175 mm, 0.1 kg
Display Dimensions: 179 x 45 x 10 mm
Medium: Brass
Credit Line: ANMM Collection
Classification:Tools and equipment
Object Name: Calipers
Object No: 00006712
Place Manufactured:London

User Terms

    With the tips pointing inward these calipers measure the diameter of a cannon ball nestled in the curve of the two blades and indicate the charge for service (normal) of proof (test) firing. With the tips pointing outward they were used to measure the bore of a cannon or mortar.
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