Vol. II: XVIII. Naval Warfare. Mechanical Appliances. Music.: 1120.
The Da Vinci Notebooks
Just as on a frozen river a man may run without moving his feet, so a car might be made that would slide by itself.
278:624 : The drawings of carts by the side of this text have no direct connection with the problem as stated in words.--Compare No. 1448, l. 17.