Gunner's callipers; brass with iron tips, for meas

Made:
1694-1744 in Rome
maker:
Dominicus Lusuerg

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Gunner's callipers; brass with iron tips, for measuring external and internal diameters from3/4" to 7 1/2"; inscribed: Dominucus Lusuerg, late 17th or early 18th century

This instrument is for measuring the bore of cannons and the diameter of cannon ballsis inscribed with the name 'Dominicus Lusuerg' who lived in Rome from 1694 to 1744. it is made of brass. The scale graduations are proportional to the cubes of the diameters so that direct reading of the weights of the balls measured are obtained. the word ferro on the scale indicates that it was intended for measuring cannon balls of iron.

Details

Category:
Hand and Machine Tools
Object Number:
1952-238
Measurements:
Open: 310 mm x 120 mm x 15 mm, 0.2 kg
Closed: 310 mm x 205 mm x 15 mm, 0.2 kg
type:
gunner's calipers
credit:
Backer, H.E.