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Lorenzo Batecin, Compasso topografico militare
Lorenzo Batecin, Surveying and military compasses

16th cent.
Gilt brass; length 28 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 3176

Compasses used by gunners and military cartographers for measuring the diameter of guns (the aperture between the points) and of cannon balls (the aperture between the extremities of the curved parts).