Leonardo da Vinci designed an escapement to improve the regularity of a clock’s movement.
An escapement is the mechanism that controls how a clock’s stored energy is released. It allows the gear train to advance in measured steps while supplying impulses to the regulating element. Leonardo’s clock studies include an escapement design using interlocking parts intended to control the motion of the mechanism.
The design belongs to Leonardo’s broader investigations of gears, weights, springs, and timekeeping. His drawings show careful mechanical analysis, but they should not be treated as proof that every pictured device was built or adopted by clockmakers. A drawing can record a proposed mechanism rather than a commercial invention.
The term is often confused with a pendulum. A pendulum is a regulating element that swings at a regular rate; the escapement is the control device that links regulation to the gear train. Leonardo worked before the widespread use of pendulum clocks, which Christiaan Huygens introduced in the seventeenth century.