Tyndall, John, 1820-1893 · New York : Appleton · leaf 380
so hear a riseand fall of the sound. It rises when the hand is over avibrating sector; it falls when the hand is over a nodalline. Thus, by sacrificing a portion of the vibrations, wemake the residue more effectual. Experiments similar tothese may be made with light and radiant heat. If oftwo beams… … § 7. Quenching the Sound of one Prong of a Tuning-fork by that of the other. You have remarked the almost total absence of soundon the part of a vibrating tuning-fork when held free inthe hand. The feebleness of the fork as a sounding bodyarises in part from interference. The prongs always vi- 372…
Sound
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