Acoustics & Sound For Musicians - Online Book

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

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100         DIRECT A XI) REFLECTED PI I            [V. § 50.
at C and D, dividing the distance AB into three equal ventral segments. We may also obtain forms with three, four, five, &c., nodes, dividing the tube into four, five, six, &c, equal ventral segments, re­spectively. The stiffness of very short portions of the tube alone imposes a limit on the subdividing process. Let us examine the mechanical causes to which these effects are due.
50. If we unfasten one end of the tube, and, holding it in the hand as in Fig. 29, raise a hump upon it, by suddenly jerking the hand transversely
through a small distance, the hump will run along the tube until it reaches its fixed extremity B; it will then be reflected and run back to A, where it will undergo a second reflexion, and so on. At each reflexion the hump will have its convexity reversed. Thus, if while travelling from A towards B its form was that of a, Fig. 30, on its way back it will have the form b. After reflexion at A, it will resume its
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E-Book - An Annotated Compendium of Old Time American Songs by James Alverson III