Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 394
n opposite phases. The consequence of this is, thatthe two sets of vibrations permanently neutralise eachother, so that at a little distance from the pipes you failto hear the fundamental tone of either. For this reasonwe cannot, with any advantage, place close to each otherin an organ several… … m the beautiful method of M. Lissajous we can illustrateoptically this alternate augmentation and diminution ofamplitude. Placing a large tuning-fork, T, fig 169, infront of the lamp, L, a luminous beam is received upon B B 2 372 LECTURE VIII. the mirror attached to the fork. This is reBected back…
Sound
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