Worlds of David Darling
Encyclopedia of Science
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A bell is a resonant metal object in the form of a cup hung from its closed end (the head), which rings when struck with a "clapper" near its rim. It is used ritually to give audible time signals and as a warning device. Modern bells are cast in bell metal to carefully computed designs so that the correct mix of fundamentals and overtones is produced when the bell is rung.

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