The Da Vinci Notebooks at sacred-texts.com
Notes on the Sforzesca near Vigevano (1024-1028).On the 2nd day of February 1494. At Sforzesca I drew twenty five steps, 2/3 braccia to each, and 8 braccia wide.
236:550 : See Pl. CX, No. 2. The rest of the notes on this page refer to the motion of water. On the lower sketch we read: 4 br. (four braccia) and giara (for ghiaja, sand, gravel).