What Leonardo da Vinci machine concept arranged many gun barrels in parallel?

Leonardo da Vinci designed a 33-barrel organ, a weapon concept with many gun barrels arranged in parallel.

The design placed the barrels in three rows of eleven. The arrangement was intended to allow several guns to fire in succession, helping crews reload one group while another group was being used. The name “organ” refers to the visual resemblance between the rows of barrels and the pipes of a musical organ.

Leonardo’s proposal belongs to his military-engineering studies, which included fortifications, artillery, bridges, and armored vehicles. It was a design drawing rather than proof of a fully operational weapon made by Leonardo.

The device is often called a “machine gun,” but that modern label can be misleading. It was a volley weapon using multiple separate barrels, not a continuously firing automatic firearm powered by a modern action.