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

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V. § 49.]              FORMS OF VIBRATION.                       99
tremity, in suitable time. According to the rapidity of the motion thus communicated, the tube will take up different forms of vibration. The simplest of these is shown in Fig. 26. A and B being its fixed ex­tremities, the tube vibrates as a whole between the two extreme positions AaB and AbB.
The tube may also vibrate in the form shown in Fig. 27, where AabB and AcdB are its extreme positions.
In this instance the middle point of the tube, C, remains at rest, the loops on either side of it moving independently, as though the tube were fastened at C as well as at A and B. For this reason the point C is called a node, from the Latin nodus, a knot. The loops AC and CB are termed ventral segments.
Fig. 28 shows a form of vibration with two nodes,
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E-Book - An Annotated Compendium of Old Time American Songs by James Alverson III