Crane for excavating canals

Crane for excavating canals

Inv. 9093
Interpretation by Alessandro Siriati, 1952 - 1953

“These instruments depicted below here show the method used when the crate of earth is lifted to its height, and a latch-chain goes in between the four cords that go off from the crate, meaning it goes in where these cords meet together. And so the crate remains suspended to this latch-chain in such a way that the two men acting as counterweight with the ox can dismount and, at their ease, return to the place where, again, they will act as counterweight.”

The crane has two arms and can rotate on a shaft. The extremity of one of the arms rests on the upper ground level, assisted by a wheel. The principal shaft is reinforced by a supporting framework. Two pulleys move the system of cords, at the extremity of which are a wooden base and a crate that opens from the bottom. Leonardo indicates the measures for this, with the central shaft 8 braccia (4.8 m) high and the arm 15 braccia (9 m) long. The counterweight for lifting the crate is provided by an ox and two men.

The model is based on the drawing:

  • Codex Atlanticus f. 1012 r. (1493)
    Milano, Biblioteca Ambrosiana