Anyone who owns a pendulum powered clock—such as many grandfather or wall hanging clocks—knows that the regulation of the pendulum needs to be tweaked in order for the clock to keep accurate time. On the bottom of the pendulum is an adjusting nut that raises and lowers the “bob” (the disc-shaped weight that makes the pendulum swing from side to side). If the bob is raised too high, the swing-angle of the pendulum will be too narrow a...
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