Acoustics & Sound For Musicians - Online Book

The Theory Of Sound Which Constitutes The Physical Basis Of The Art Of Music.

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V. § 50.] DIRECT AND REFLECTED PULSES.          101
first form a, and so on. Now, instead of a single jerk, let the hand holding the free end execute a series of equal continuous transverse vibrations. Each complete vibration will cause a wave, ab Fig. 31, to
pass along the tube from A to B, where reflexion will reverse the protuberances, so that the wave will re­turn from B to A stern foremost. Next let the tube be again fastened at both ends, as before, and the vibrations of the hand impressed at some intermedi­ate point, as C, Fig. 32.
Two sets of waves will now start from C in the directions of the arrows. They will be reflected at A and B, and then their effects will intermingle. Let us suppose that the tube has been set in steady motion and, on the removal of the hand, continues its vibra­tions without any external force acting on it. Two sets of equal waves are now moving with equal ve­locities from A towards B and from B towards A, and we have to determine the motion of the tube under their joint action.
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