Leonardo da Vinci designed an escapement mechanism to regulate a pendulum’s motion.
An escapement controls the release of energy from a clock’s driving mechanism. It allows the gear train to advance in measured steps while giving the pendulum regular impulses. Leonardo’s clock studies included a pendulum and a toothed mechanism intended to control movement more evenly.
Leonardo made these studies before Christiaan Huygens introduced the pendulum clock in 1656. His drawings therefore belong to the long development of accurate mechanical timekeeping, but they did not produce the first practical pendulum clock. Leonardo’s mechanism should be viewed as an early proposal rather than as a completed standard clock movement.
The term escapement refers to the regulating part, not the pendulum itself. A pendulum swings back and forth; the escapement converts that regular swing into controlled wheel movement. This distinction helps separate Leonardo’s clock concepts from hourglasses and from later balance-wheel watches.