Leonardo tries to improve the systems of locks and channels already in use in Milan. This is a mechanism for opening and closing sluice doors: a small wicket with a latch could be operated from above. Once opened, it allows enough water to pour in so as to balance the pressure on the two sides of the main door. The opening is thus easier. This drawing, produced during his stay in Milan under the French domination, depicts the lock of S. Marco.
The model is based on the drawing:
- Codex Atlanticus f.656a r. (1506-1508)
Milano, Biblioteca Ambrosiana