The Pendulum Has Stopped 1.
Wall clocks have either a swinging pendulum or a balance wheel to regulate time keeping.
If you don't see a pendulum attached to your clock movement, then your clock is regulated by a balance wheel. First, be sure that you have wound up the pendulum spring. Wind it up all the way. Next, reach into the clock and gently swing the pendulum to one side with your hand. You should hear a ticking sound similar to that of a mechanical wrist watch.