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Gunners' calipers
Gunners' calipers

Gunners' calipers

Maker (British, 1750 - 1795)
Datec 1790
Object number00006712
NameCalipers
MediumBrass
DimensionsOverall: 175 mm, 0.1 kg
Display Dimensions: 179 x 45 x 10 mm
ClassificationsTools and equipment
Credit LineANMM Collection
DescriptionWith 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.