What weapon did Leonardo da Vinci design with a wide frame and many parallel firing barrels?

Leonardo da Vinci designed a 33-barrel organ with many parallel firing barrels.

The weapon consisted of a broad frame holding rows of small cannons. The arrangement was intended to fire a volley across a wide area, increasing the chance of striking enemy troops compared with a single cannon. The frame could be adjusted to support loading and aiming, although the design was not a modern rapid-fire gun.

The word “organ” refers to the visual arrangement of the barrels, which resembled the pipes of a musical instrument. Leonardo’s military notebooks contain several ideas for improving artillery and battlefield equipment, including devices for concentrating or spreading fire.

The 33-barrel design was a proposal, not a documented battlefield success. Reloading many barrels would still have been slow, and the weapon would have required careful handling because early gunpowder artillery produced smoke, recoil, and considerable danger to its crew.