In a clock movement, the escapement is the mechanism placed between the ensemble of cogs and pinions, and the regulator - the balance wheel or pendulum. Its purpose is to control the movements of the pendulum and to convert rotational motion (the cog) into oscillating motion (the pendulum).
The escapement of this clock consists of a vertical cog meshed with a coiled spring mounted on the axis of the pendulum. This cog drives the alternating movement of the pendulum. Honoré Pons patented this escapement on 8th May 1829. Experts regard it as a variation on the duplex escapement presented to the Académie des Sciences by Pierre Le Roy in 1742. Pons modified it by making it less fragile. Technically, this mechanism is designed for travel clocks.