What rotating weapon did Leonardo da Vinci design with 33 gun barrels?

Leonardo da Vinci designed a 33-barrel organ, a rotating weapon with 33 gun barrels.

The device arranged small cannons in three rows on a triangular platform. As one row fired, another could be loaded while the platform was turned. The arrangement was intended to produce a rapid sequence of shots and reduce the delay associated with reloading individual guns.

The name “organ” refers to the visual arrangement of the barrels, which resembles the pipes of a musical instrument. It was a gunpowder weapon, not a musical organ. Leonardo’s design belongs to his broader work on military engineering during the late 15th century.

The weapon was never a standard battlefield armament. Its many barrels would have created logistical and handling problems, and coordinated firing and reloading would have been difficult. It is mainly remembered as an inventive attempt to increase artillery fire rate.