The Bridge ("Ponte salvatico"). Found in the Collection of Veneranda Biblioteca Ambrosiana. Artist Leonardo da Vinci (1452-1519). (Photo by Heritage Images/Getty Images)
Water pumps, circa 1480. Found in the Collection of Veneranda Biblioteca Ambrosiana. Artist Leonardo da Vinci (1452-1519). (Photo by Heritage Images/Getty Images)
Machine to produce gold foil, circa 1493. Found in the Collection of Veneranda Biblioteca Ambrosiana. Artist Leonardo da Vinci (1452-1519). (Photo by Heritage Images/Getty Images)
Catapults, c. 1490. Found in the Collection of Veneranda Biblioteca Ambrosiana. (Photo by Fine Art Images/Heritage Images/Getty Images)
Water pumps, circa 1480. Found in the Collection of Veneranda Biblioteca Ambrosiana. Artist Leonardo da Vinci (1452-1519). (Photo by Fine Art Images/Heritage Images via Getty Images)
