Tyndall, John, 1820-1893 · New York : D. Appleton and company · leaf 419
By the method of M. Lissajous we can combine therectangular vibrations of two tuning-forks, a subjectwhich I now wish to illustrate before vou. In front of FIG. 172. … an electric lamp, L, Fig. 172, is placed a large tuning-fork,T, fixed in a stand horizontally, and provided with a COMPOSITION OF SONOROUS VIBRATIONS. 4U mirror, on which a narrow beam of light, L T, is per-mitted to fall. The beam is thrown back, by reflection.In the path of the reflected beam is…
Sound
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