“The winch marked a turns until its post gathers up all the chains supporting the sluice gate. Once it has gathered it up and the sluice gate is touching with the post, it works as a lever. The sluice gate works as a lever in the manner depicted below in the second construction.”
This study for a sluice gate refers to the possibility of constructing locks for overcoming altitude differences along watercourses having irregular flow. A wooden sluice gate slides within the lodging space between thick pylons. The sluice gate is connected by means of two cables to a bar that turns on a pivot, connected to an actuating crank. This sluice gate regulates the opening of the lock by means of two successive movements: it is raised by the rotation of the bar about itself and, once having reached its highest point, it is lifted by a winch. Using this method is possible to allow even tall watercraft with sails to pass through the lock. In Leonardo’s drawing, the watercourse is divided for brief tracts by dike embankments, with a lock having a double system of doors positioned at each embankment. By means of the locks, a boat can then descend or ascend the level differences, just as in artificial canals.
The model is based on the drawing:
- Codex Atlanticus f. 90 v. (1475-1480)
Milano, Biblioteca Ambrosiana