tion at that point is null.This is the result of the mutual interference of waves. Join thepoints at which there is maximum movement whether of crest * Lord Rayleigh, Theory of Sound, i. 275..K 130 KINEMATICS. [CHAP. or trough; join also those at which crest and trough coincide : wethus obtain a… … to it, there is rest; along cc there is concurrence; along dd ap-proximate rest, and so on. The hyperbolic lines && and dd would be lines of perfect rest if it werenot that the one wave is half a wave-length, one-and-a-half wave-length, etc.,behind the other, and hence the amplitudes are…
Physics
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