HANDBOOK OF ACOUSTICS - online book

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

	50                     HAND-BOOK OF ACOUSTICS.
	This is also the difference between a Major and a Minor Third, for The interval between the Greater and Lesser Chromatic Semitones will be which is usually termed the Comma or Komma. Referring to the first table of vibration numbers on page 46, we have 1 = 480, and r = 324; therefore and thus, as noticed above, it is not a Perfect Fifth. To form a Perfect Fifth with 1, a note rx would be required, such that It is easy to find the vibration number of this note if that of 1 be given, thus:—
	This note has been termed rah or grave r, and may be conveniently written, r\ Similarlyis not a true Minor Third, for its vibration ratio is but | *» is a true Minor Third, forits vibration ratio is The interval between r and rv is the comma, its vibration ratio being evidently SummaRy. The sounds used in Music He within the compass of about eight Octaves. The vibration ratio or vibration fraction of an interval, is the ratio of the vibration numbers of the two sounds forming that interval. The vibration ratios of the principal musical intervals have been exactly verified by Helmholtz's modification of the Double Syren.