Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 139
ation of Vibrations. 467. Lissajous Figures. A very light reflector, m,Fig. 155, is attached to one prong of a tuning fork, anda balancing weight, n, to the other. A lamp surroundedby an iron chimney which has a small hole in it, is placedsome yards distant, so as to send a single beam of lightupon… … Fig. 155. 468. Image Produced by a Single Vibrating Body. When the tuning fork is still, the reflection is a circularspot. When it vibrates, the spot becomes a line. Turningthe fork around changes the line into a series of waves. 469. Combination of two Vibrations. If two forkswhich vibrate at the…
Physics
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