What machine did Leonardo da Vinci design to produce many cannon shots in rapid succession?

Leonardo da Vinci designed a 33-barrel organ to fire many cannon shots in rapid succession.

The machine consisted of three rows of eleven small cannons mounted on a wheeled frame. The arrangement resembled the pipes of an organ, which explains the name commonly used for the design. One row could be fired while another cooled or was prepared, allowing the operator to maintain a more continuous sequence of fire than with a single cannon.

The weapon belonged to Leonardo’s military-engineering work in the late fifteenth century. It was not a modern machine gun: the barrels fired separate artillery projectiles, and the mechanism still required loading, ignition, and crew operation. There is no reliable evidence that Leonardo’s exact 33-barrel design was used successfully in battle.

The number 33 is important because it identifies the specific layout, not a general description of multi-barrel artillery. Leonardo also drew other military devices, including an armored vehicle and various bridges. Those designs should not be merged with the 33-barrel organ when identifying this weapon.