What type of cannon did Leonardo da Vinci design with three barrels firing in succession?

Leonardo da Vinci designed a triple-barrel cannon with three barrels arranged to fire in succession.

The weapon formed part of Leonardo’s military engineering studies. Multiple barrels could potentially increase the rate of fire compared with a single cannon, while a rotating or adjustable arrangement might allow crews to prepare one barrel while another was being used. Leonardo’s drawings explored several artillery improvements, including lighter weapons and mechanisms intended to make reloading more efficient.

The triple-barrel design should not be confused with a modern machine gun or a firearm that fires all rounds automatically. Renaissance artillery still depended on manual loading, gunpowder, and careful handling. Leonardo’s proposals were engineering concepts rather than a documented standardized weapon adopted by an army.