Cannon with screw elevating gear

This is one of the three firearms drawn by Leonardo on the same folio. It comprises a very easily manoeuvrable carriage mounted on wheels, and its elevation can be adjusted in height by means of a screw. This gun, which is front-loaded and has a bronze muzzle, was meant to be used in field action by infantrymen.
Codex Atlanticus, sheet 76 v. 1480-82