Cannon with peg elevating gear

This is one of the three firearms drawn by Leonardo on the same folio. Owing to its size, it was intended to be used in field action by infantrymen. Besides having a light gun-carriage mounted on wheels, this weapon can be adjusted in height by means of a peg blocking system. This gun is front-loaded and has a bronze muzzle.
Codex Atlanticus, sheet 76 v. 1480-82