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

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144                     QUALITY AND PHASE,             [VI. § 72.
of the kind shown in Fig. 47, where three different cases are represented.
We have here vibrations starting in different phases.
It is clear from the figure that all phase -differences can be properly represented by merely causing the waves engaged to assume different po­sitions upon the initial line with reference to each other. The second and third cases are obtainable from the first by sliding the system of shorter waves bodily along the initial line, while the other system of waves retains its position.
By the help of the instrument mentioned on p. 138 Professor Helmholtz has demonstrated that, when a number of partial-tones are independently produced, the clang into which they coalesce has the same quality, whatever differences of phase may exist
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E-Book - An Annotated Compendium of Old Time American Songs by James Alverson III