Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 608
lthough thepalisade and fence might conceivably be used acoustically 579-581 ACOUSTIC DETERMINATIONS 587 as the grating and echelon are used optically, they are notso used in the case referred to. For in the optical casewith monochromatic light the incident waves form a con-tinuous train of… … 5 3 k ^kl k %fc Fig. 100.—Woods Photograph of Musical Echo. « the successive bars is almost confined to a single pulse orpart of a wave. Thus the frequency of the succession ofimpulses received at any point depends upon the differencein length of the paths traversed from the source to theobserver…
Sound
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