Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 79
a straightone. This is the visual expression of decreasing ampli-tude. When the sinuosities entirely disappear the ampli-tude has become zero, and the sound, which depends uponthe amplitude, ceases altogether. To M. Lissajous we are indebted for a very beautifuimethod of giving optical expression…
Sound
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