In 1482 in a letter to Ludovico il Moro, ruler of Milan, Leonardo boasted that he could build bridges that were extremely lightweight and strong with characteristics potentially useful during wartime.
In this page, Leonardo drew two mobile bridges that could easily be assembled and rapidly disassembled.
The bridge presented here is mobile both ends permitting soldiers to cross the defensive moat of a fortress but it can be rapidly moved so the enemy cannot cross it and strike back.
Credit : HK Sciences Museum.
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