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

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I. §9.]             TRANSVERSE VIBRATIONS.                   17
by a 'complete vibration' as that term is used by English writers.
Let a point move from A' to A along the straight
line A'A and then back again to A'. A French writer would describe this movement as made up of tivo complete vibrations executed in opposite directions. An English writer would designate it as one complete vibration consisting of two half-vibrations performed in opposite directions. This latter usage will be adhered to in the sequel. The completion of a vibration is thus to be determined by the moving point having traversed its entire path, in both directions, and this is equally true if instead of starting from either extremity it occu­pies initially an intermediate position such as 0 and moves from 0 to A, from A to A' and from A' to 0 ; or reversely from 0 to A', from A' to A and from A to O.
The ' period' of a vibration accordingly means the time which it takes the moving point to perform one such complete cycle of its motion.
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E-Book - An Annotated Compendium of Old Time American Songs by James Alverson III