Tyndall, John, 1820-1893 · New York : Appleton · leaf 372
are brought out. Thesehigher notes also interfere,and you have these quickerbeats. No more beautiful illus-tration of this phenomenoncan be adduced than thatfurnished by two sounding-flames. Two such names arenow before you, the tube sur-rounding one of them beingprovided with a telescopicslider,… … slower ; now slower still; and now both flames sing to-gether in perfect unison. Continuing the upward motionof the slider, I make the tube too long; the beats beginagain, and quicken, until finally their sequence is sorapid as to appeal only as roughness to the ear. Theflames, you observe, dance…
Sound
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