Tyndall, John, 1820-1893 · New York : Appleton · leaf 367
us call the motion which increases the distancethe outward swing, and that which diminishes the dis-tance the inward swing of the fork. And let us supposethat our two forks, a and b, Fig. 150, reach the limitsof their outward swing and their inward swing at the samemoment. In this case the phases… … prongs; and now let us ask what must be the distancebetween the prongs A and b, when the condensations andrarefactions of both, indicated respectively by the darkand light shading, coincide? A little reflection will makeit clear that if the distance from b to a be equal to thelength of a whole…
Sound
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