Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 386
oth. We have here a phenomenonwhich, above all others, characterises wave-motion. It mTERFERE^XE OF SOUiSD. 363 was this phenomenon, as manifested in optics, that led tothe undulatory theory of Hght, the most cogent proof ofthat theory being based upon the fact that, by addinglight to light, we may… … nished. Let us call the motion which increases thedistance the outward swing, and that which diminishesthe distance the imvard stuing of the fork. And let ussuppose that our two forks, A and B, fig. 163, reach the limitsof their outward swing and their inward swing at the samemoment. In this case…
Sound
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