mitre gate

The development of the mitre lock, a double-leaf gate the closure of which formed an angle pointing upstream, heralded a period of extensive canal construction during the 16th and 17th centuries. The canals and canalized rivers of that period foreshadowed the European network to be developed over many years.

The most generally used are mitre gates consisting of two leaves, the combined lengths of which exceed the lock width by about 10 percent. When opened, the leaves are housed in lock wall recesses. When closed, after turning through about 60°, they meet on the lock axis in a V…

The mitred canal gate, angled into the downward force of the stream and replacing the earlier vertical lift gate, may have been invented by Leonardo da Vinci for the San Marco Lock in Milan, making possible the interconnection, formerly prevented by their different levels, of the…