Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 402
ith the same rapidity, over two resonantjars, the sound of both flows forth in unison. When abit of wax is attached to one of the forks, powerful beatsare heard. Eemoving the wax, the unison is restored.When one of these unisonant forks is placed in the flameof a spirit-lamp its elasticity is… … 175, loud beats declare the absence of unison. Dividinga jar by a vertical diaphragm, and bringing one of theforks over one of its halves, and the other fork overthe other ; the two semi-cylinders of air produce beatsby their interference. But the diaphragm is not neces-sary; on removing it, the…
Sound
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