Tyndall, John, 1820-1893 · New York : Appleton · leaf 213
note swells out again.1 § 9. Reenforcement of Bell by Resonance. This fine, sonorous bell, Fig. 94, is thrown into intensevibration by the passage of a resined bow across its edge.You hear its sound, pure, but not very forcible. When, 1 This experiment is more easily executed with hydrogen than… … As the tube is alternately withdrawn and advanced, thesound sinks and swells in this extraordinary manner. The second tube, open at both ends, is capable of beinglengthened and shortened by a telescopic slider. Whenbrought near the vibrating bell, the resonance is feeble.On lengthening the tube by…
Sound
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