Leonardo da Vinci designed a mechanical drum intended to produce automatic musical rhythms.
The device used a rotating cylinder fitted with projecting pegs. As the cylinder turned, the pegs struck or activated drum components in sequence, creating a repeated rhythm without a human drummer directly performing every beat.
This idea belongs to the broader Renaissance tradition of mechanical music. Programmable cylinders, pins, and cams could control the timing of sounds, much as later music boxes and mechanical organs used coded surfaces to select notes.
The mechanical drum should not be confused with Leonardo's viola organista, which used strings and a rotating wheel. The drum concept produced percussion through programmed mechanical action rather than bowed strings.