Pendulums are fundamental components of many mechanical clocks, including grandfather clocks, wall clocks, and mantel clocks. In clocks, the swinging motion regulates the movement of the clock’s gears, providing a consistent and precise timekeeping mechanism. The swinging motion controls the rate at which the clock’s gears advance. Resulting in the accurate measurement of time. The length and its swing arc determine the period of each swing. Which in turn governs the clock’s timekeeping accuracy. The rate at which a pendulum swings adjusts to fine-tune the clock’s timekeeping accuracy. This is typically done by changing the length or adjusting the position of a regulating nut or screw found on the pendulum’s rod.