What musical machine did Leonardo da Vinci design with 33 gun barrels?

Leonardo da Vinci designed a 33-barrel organ, a musical machine that arranged many small cannon-like barrels to produce repeated shots or tones.

The design is usually described as an organ gun because its barrels were arranged in a way that resembled the pipes of an organ. Leonardo proposed firing the barrels in sequence, allowing a single machine to create a rapid barrage instead of waiting to reload one gun at a time.

Leonardo presented the concept as a military device rather than as a musical instrument. The name refers to its organ-like arrangement, not to ordinary organ pipes. The design is associated with the military engineering studies he produced in the late fifteenth century.

It is also called a 33-barreled cannon in some descriptions. Unlike a modern machine gun, it did not use a self-loading mechanism; the barrels were prepared in groups so that firing could be repeated more quickly.