Tyndall, John, 1820-1893 · New York : Appleton · leaf 184
ous, a closeapproximation to this inscribed square is obtained. Thereason is that when the plate is agitated in this mannerthe two sets of vibrations which we have been consideringactually coexist in the plate, and produce the figure clue totheir combination. Again, place the squares of glass one… … Then it is manifest that on superposing the vibrations themiddle point of our middle square must be a point of rest;for here the vibrations are equal and opposite. The intersections of the nodal lines are also points of rest, and 170 SOUND. so also is every corner of the plate itself, for here…
Sound
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