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 |
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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. |
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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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