What Leonardo da Vinci weapon placed 33 small guns in three rows?

Leonardo da Vinci designed an organ gun with 33 small guns arranged in three rows.

The weapon is called an organ gun because its multiple gun barrels resemble the pipes of a musical organ. Leonardo’s design arranged the barrels so that one group could be fired while another group was being loaded or cooled, improving the weapon’s potential rate of fire compared with a single cannon.

The 33-barrel arrangement is one of the most frequently cited details of Leonardo’s multi-barrel gun design. It belonged to a broader family of Renaissance experiments with volley weapons and coordinated artillery fire.

This weapon is distinct from Leonardo’s giant crossbow, which used a very large bow, and from his armored vehicle, which carried guns beneath a conical shell. The organ gun was a concentrated artillery design rather than a mobile armored fighting vehicle.