Leonardo da Vinci designed a mitre lock, using paired gates to control canal water levels and boat passage.
Leonardo worked on canal engineering in northern Italy and is associated with improvements to canal locks, especially around Milan. A pound lock has a chamber between two sets of gates. Water can be admitted or released to raise or lower the chamber, allowing a boat to move between waterways at different elevations.
Mitre gates meet at an angle pointing upstream. Water pressure pushes the two gates together, helping them seal the opening. Leonardo’s studies show careful attention to gates, channels, water flow, and the practical needs of navigation. His canal work was part of a broader effort to improve transport and water management in Lombardy.
Leonardo did not invent the entire principle of canal locks. Earlier water-control systems existed in China and Europe, and Milan’s canals already had a development history before his involvement. His importance lies in designing and refining sophisticated lock mechanisms for local engineering projects.