What clockwork device did Leonardo da Vinci design to measure time with an escapement?

Leonardo da Vinci designed a mechanical clock using gears and an escapement mechanism to regulate motion.

His notebooks contain detailed studies of clockwork, including toothed wheels, weights, springs, and mechanisms that could control the release of energy. An escapement allows a gear train to advance in measured steps rather than turning freely, making regular timekeeping possible. Leonardo was investigating ways to improve the reliability and precision of mechanical clocks.

Leonardo did not invent the mechanical clock itself. Weight-driven mechanical clocks had existed in Europe before his lifetime, and earlier clockmakers had already developed important escapement systems. His contribution was the analysis and refinement of mechanisms, recorded through technically detailed drawings.

The designs should also be distinguished from sundials, water clocks, and hourglasses. Those devices measure time through sunlight, flowing water, or falling sand, while a mechanical clock depends on stored energy, gears, and controlled movement.