HANDBOOK OF ACOUSTICS - online book

A complete view of Acoustical Science & its bearings on music, for musicians & music students.

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ON INTERFERENCE.                          153
The number of beats per second, due to simple tones, is equal to the difference of their vibration numbers.
This fact is the principle of the Tonometer, of which there are two varieties,
(1)  The Tuning-fork Tonometer;
(2)  The Reed Tonometer.