What mechanical device did Leonardo da Vinci design to make a drum beat automatically?

Leonardo da Vinci designed a mechanical drum that could beat automatically.

The device used a rotating cylinder fitted with pegs. As the cylinder turned, the pegs engaged levers connected to drumsticks, causing the sticks to strike the drum in a programmed sequence. The idea is an early example of mechanical music controlled by a repeating pattern.

Leonardo’s musical machines were part of his broader interest in court entertainment and automation. A self-playing drum could provide rhythm during a procession or pageant without requiring a human drummer to perform continuously.

The drum is sometimes grouped with Leonardo’s automata, including his robotic knight. They are different machines: the knight imitated human movement, while the drum produced a repeated musical rhythm. The design also anticipates later pinned-cylinder mechanisms used in mechanical musical instruments.