Drawing, "Page from a drawing book: The Foundry (Pulvis Pyrius)", ca. 1590
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Six men are making canons: one is a fireman working in a room in the back; two finish canons with chisel and hammer (one an almost completed canon, the other - a muzzle); two more men on the obverse; the sixth man stands beside a polished cannon holding an oblong object. Metal is streaming from a square hole in the wall in the left central plane; a ladder and a wheel are at right. The caption, near lower center, reads "Fondiera".