Leonardo da Vinci designed a mechanical clock using weights, gears, and a regulating mechanism to record the passage of time.
His clock studies explored a weight-driven train of gears and a pendulum-like regulating system. Leonardo also examined ways to separate the functions of timekeeping, striking, and winding. These drawings show his interest in improving reliability and reducing friction in complex machines.
Leonardo’s designs belong to the period after European mechanical clocks had already become established. They were proposals and studies rather than proof that he built a finished clock of his own design. The drawings are valuable because they reveal how he analyzed timing, energy transfer, and mechanical control.
A mechanical clock differs from a sundial or water clock because it uses a stored mechanical power source and a gear train. Leonardo’s clock ideas should therefore be understood as refinements and investigations within an existing technology, not as the invention of clockmaking itself.