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Squadra da bombardieri
Gunner’s quadrant

17th cent.
Brass length 33 cm, lower side 13 cm, radius 7,5 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 659

Thanks to a plumb-line suspended from a hole in the corner, the gunner was able to determine the ratio of the calibers of projectiles to the required gun elevation and to measure the gradients of scarp walls in fortifications.