Machine for lifting pillars

Elaborating on known systems, designed by Francesco di Giorgio Martini and other engineers and architects, Leonardo perfected this mobile hoist for transporting and lifting pillars and obelisks. The system was based on the side-sliding motion of a trolley, designed to contain the base of the pillar. A wheel operated by means of a winch set both the trolley and the large worm screw placed at the centre of the device in motion. This pushed up the other end of pillar, thus lifting it.