Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 92
y beassumed that all parts of space between A and CE havebeen traversed by the wave disturbance. Hence BG,concentric with CE, was at some instant the wave front.At this instant each point along BG was in a state ofdisturbance, and might therefore be regarded as the originof an elementary… … Fig. 24.—Huyghens Principle. 74 SOUND CHAP. II would be tx +10. Thus, if the velocity of propagation bedenoted by v, we have AC == v(t +1), taking the ordinaryview of propagation without any reference to the inter-mediate wave front BG. Secondly, on taking Huyghensview, we have AB = vtv and BC = vt…
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