Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 171
scribe are very clearly drawn upon the plates. M. Strehlkehas sketched these appearances, and from him the patternsA, B, c, fig. 73, are borrowed. An effect of vibrating plates which long perplexedexperimenters is here to be noticed. When, with the sand Fig. 74. Mm ii V Fig. 75. \ •^^^sas^ / / / +… … strewn over a plate, a little fine dust is mingled, say thefine seed of lycopodium; this light substance, insteadof collecting along the nodal lines, forms heaps at theplaces of most violent motion. It is heaped at the fourcorners of the plate, fig. 74, at the four sides of the plate,fig. 75, and…
Sound
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