Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 168
are are lines of no motion. We have thus far been theorising. Let us now clipa square plate of glass at a point near the centre of oneof its edges, and draw the bow across the adjacent cornerof the plate. When the glass is homogeneous, a closeapproximation to this inscribed square is obtained.… … Again, place the squares of glass one upon the otherexactly as in the last case ; but now, instead of supposingthem te concur in their vibrations, let their correspondingsections oppose each other: that is, let a cover a, fig. 71.Then it is manifest that on superposing the vibrations themiddle…
Sound
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