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Temporary bridge on a double row of trestles

Ponte di circostanza su doppia fila di cavalletti

In this design, the bridge is made up of a double row of trestles to support the framework. Leonardo gives tips on the materials to use and the steps to take to build this machine. To construct the bridge, it was necessary to set up a makeshift framework to be covered with poles of light wood that could be easily handled. The makeshift load-bearing framework was then replaced with a permanent structure of big tree trunks arranged to form trestles. This design, too, can be dated to the period when Leonardo arrived in Milan.

Codex Atlanticus, sheet 57 v.


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