"This needs to look like one of the three iron screws of the work at Santa Liberata. Form of
plaster and casting of wax"
Keel-breaching device, intended to be operated directly by the assault troops, primarily the divers. The U-shaped clamp is combined with a large central screw.The two branches of the U are attached to two non-contiguous boards of the ship’s hull. The screw is then screwed into the central board. Once this has been firmly screwed in and fixed, the second crank is actuated: by exerting pressure on the two arms of the device, the hull is breached, provoking the sinking of the ship.
The model is based on the drawing:
- Codex Atlanticus f. 909 v. (1485-1487)
Milano, Biblioteca Ambrosiana