What rotating firearm did Leonardo da Vinci sketch with multiple barrels arranged in rows?

Leonardo da Vinci sketched a 33-barrel organ, a multi-barrel firearm designed to fire volleys from rows of small cannons.

The weapon is commonly associated with Leonardo’s military engineering work and is sometimes called a triple-barrelled cannon or organ gun. Its barrels were arranged on a broad frame, allowing several shots to be fired in succession or together. The nickname “organ” comes from the visual resemblance between the rows of barrels and the pipes of a musical organ.

A rotating or repositionable frame was intended to make the weapon easier to aim and reload between volleys. The arrangement could also spread fire across a wider area than a single cannon.

Leonardo did not create a modern machine gun. The 33-barrel organ still required manual loading and gunpowder, and there is no evidence that his exact design became a standardized weapon. It belongs to the long history of volley firearms and multi-barrel artillery.