Leonardo da Vinci devised a machine for placing columns by drawing on the principle of the screw. The cradled column is cranked upward until it can be swung into a vertical position and lowered onto its base at the center of the machine.
Leonardo da Vinci devised a machine for placing columns by drawing on the principle of the screw. The cradled column is cranked upward until it can be swung into a vertical position and lowered onto its base at the center of the machine.