Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 75
ion, in virtue ofwhich the impression on the retina persists for about atenth of a second after the removal of the stimulus which 56 SOUND CHAP. II produced it. Hence if the periods of the components areexactly equal, we have a steady or stationary figure whoseform depends upon the phase-difference… … Fig. 15a.—Stohrers Apparatus. of the smaller periods, and hence the figure appears to slowlymelt or dissolve from one characteristic form to another,passing in turn through all the forms possible for practicallyequal periods. Unlike the spherical pendulum just described, the com-ponent vibrations…
Sound
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