Gunner's rule in ivory and brass, four-fold, plus

Made:
1818 in Holborn
maker:
W Harris and Company

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Gunner's rule in ivory and brass, four-fold, plus ivory scale for spherical case shot signed I.E. Henson and dated 28 January 1818, both by William Harris & Co., 50 High Holborn, in sharkskin etui

Details

Category:
Mathematics
Object Number:
1986-423
Materials:
brass, ivory and steel
Measurements:
case: 21 x 177 x 30 mm
scale: 1.5 x 155 x 24 mm
rule - closed: 12 x 165 x 26 mm
type:
military scales
credit:
Sotheby's (New Bond St)