Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 69
we haveonly to shift the numerals on either circle through 180°, E 50 SOUND CHAP. II the others remaining undisturbed, and we obtain the path BOB. Again, let the phase difference be a quarter of a period,that is, its angular measure is tt/2. It is then easily seenthat the resultant is an ellipse… … Fig. 15.—More General Case of Composition. a circle also, and is described by E with constant speed.The fact that two rectangular simple harmonic motions ofequal period and amplitude and phase difference tt/2 com-pound into a uniform circular motion is also obvious fromthe definition of simple…
Sound
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