How old are pendulums?

From the first scientific investigations of the pendulum around 1602 by Galileo Galilei, the regular motion of pendulums was used for timekeeping, and was the world's most accurate timekeeping technology until the 1930s.

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Keeping this in consideration, how do you dowse?

In the classic method of using a forked stick, one fork is held in each hand with the palms upward. The bottom or butt end of the "Y" is pointed skyward at an angle of about 45 degrees. The dowser then walks back and forth over the area to be tested. How do you witch for water with a coat hanger? Try it yourself by cutting a wire coat hanger into two, discarding the hook, and holding the short lengths lightly in you hands, long lengths out straight, as you walk towards a water source.

Thereof, how do you make a pendulum that never stops?

Give it a tiny push once every swing (like in a grandfather clock). If that is not allowed, it will stop, but it can be kept swinging as long as possible as follows: Increasing the weight at the bottom end. Increasing the length. How do you swing a pendulum clock? Place the clock where it is to be used, on a stable, level surface. Open the front door and hang the pendulum on the hook (on many clocks the hook is behind the dial), give the pendulum a swing, and the clock will start ticking.