The endless-chain winding system was invented by Christiaan Huygens (1629-1695) as one of the earliest applications of the pendulum to precision clocks. A single rope hangs from the pulley attached to the main wheel of the going train (timekeeping train) and passes over a small pulley to which the driving weight is hooked. The rope then rises onto the pulley of the main wheel of the chime train, from where it descends again, passes over another small pulley to which the counterweight is hooked, and lastly rises up to the time pulley. The chime pulley is connected to a ratchet wheel with a click (pawl) that lets it rotate only in the direction of the counterweight. Consequently, by pulling the rope to one side, the driving weight (and hence the power) is raised without causing the weight to stop driving the going train.