His first experiments involved driving a simple pendulum with a pulse motor. He discovered that the easiest way to keep the pendulum moving was to use a coil to detect when the it reached the ...

This case is fairly simple, because here the earth and the pendulum are not exerting much influence on each other. As you move off the north pole down to a more southerly point like Washington, for ...

The build is simple and clever; a small stepper motor is mounted in the clock just underneath the pendulum. Every 12 hours, the stepper motor moves a lever and slowly stops the pendulum over the ...