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The bridge was designed by Leonardo Da Vinci between 1485 and 1490, to be built rapidly with local trees, that could be easily slid into place, lashed together, and then crossed quickly, making troop movement over rivers speedy, creating a surprise factor that was critical to success in battles. Leonardo applied the laws of statics, which he had developed during his architectural research. In his journals he wrote laws about friction, one of which stated that if the load on an object is doubled, its friction also doubles. Interestingly, when weight is applied down, it gets tighter and stronger, yet when lifted it falls.
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