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Bob is a ball like substance that is tied at the end of the pendulum for firmness and rigidity.
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A bob is the weight on the end of a pendulum most commonly, but not exclusively, found in pendulum clocks.
Traditionally, a pendulum bob is a round flat disk, lens-shaped in section, but bobs in older clocks often have decorative carving and shapes characteristic of the type of clock. They are usually made of a dense metal such as iron or brassLead is denser, but is usually avoided because of its softness, which would result in the bob being dented during its inevitable collisions with the inside of the clock case when the clock is moved.
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