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Guillotine sluice-gate

Paratoie a ghigliottina

The sheet dates back to the Tuscany period. It is part of Leonardo's studies on the navigability of rivers with irregular water flow. These drawings depict a large navigable channel with sluices, locks and many ships sailing up river. The water course is divided into short stretches by a number of crossbeams. Each crossbeam sustains a slice with a double door system. Thanks to the sluices a boat going both upwards and downwards can cross the water jumps created by the crosspieces, just like in artificial channels. Leonardo draws the detail of the floodgate twice and in a note he explains that the mechanism works thanks to a winch.

Codex Atlanticus, sheet 90 - 1474-80


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