This type of winch was used for raising pieces of artillery, such as bombards, or columns. The winch is of the classical trestle form. At the upper part, a balance-type arm rocks on a pivot: one extremity is connected with an endless screw, while the other bears a bombard tied with cords. The raising and lowering is effected by means of an endless screw and a helicoid wheel acting as screw bolt. The movement causes the central axis on which the cannon is hanging to oscillate slowly, thus raising it.
The model is based on the drawing:
- Codex Atlanticus f. 77 v. (1495)
Milano, Biblioteca Ambrosiana