Does the pendulum vary any in its vibrations, or the time of moving to and fro?
The pendulum does not vary any in its vibrations.
Fig. 37.
Why does the pendulum keep moving?
When the pendulum is at A, in [Fig. 37], gravity causes it to descend to C, and the motion it gains while falling to C carries it up to B; gravity then causes it to descend to C, and the motion it gains while falling to C carries it back to A again.
What helps to keep the pendulum in motion?
The works inside of the clock help to keep the pendulum in motion.
How long must the pendulum be, so as to tick once in every second?
The pendulum must be thirty-nine inches long.