=334. A musical interval= _refers to the ratio between the pitches[O] of two notes_ as indicated by the results of the siren experiment. The simplest interval, or ratio between two notes is the _octave_, C':C, or 2:1 (48:24). Other important intervals with the corresponding ratios are the _fifth_, G:C, or 3:2 (36:24); the _sixth_, A:C, or 5:3 (40:24); the _fourth_, F:C, 4:3 (32:24); the _major third_, E:C, or 5:4 (30:24); and the _minor third_, G:E, 6:5. The interval between any two notes may be determined by finding the ratio between the vibration numbers of the two notes. Thus, if one note is produced by 600 vibrations a second and another by 400, the interval is 3:2, or a _fifth_, and this would be recognized by a musician who heard the notes sounded together or one after the other. Below is a table of musical nomenclatures, showing various relations between the notes of the major scale. [O] Pitch as used here, means _vibration rate_. TABLE OF MUSICAL NOMENCLATURES ---------------------+---+------+------+------+------+------+-------+---- Name of note | C | D | E | F | G | A | B | C´ ---------------------+---+----- +----- +------+------+------+-------+---- Frequency in terms of|_n_|9/8_n_|5/4_n_|4/3_n_|3/2_n_|5/3_n_|15/8_n_|2_n_ "do" | | | | | | | | ---------------------+---+--+---+--+---+--+---+--+---+--+---+---+---+---- Intervals | 9/8 | 10/9 | 16/15| 9/8 | 10/9 | 9/8 | 16/15 ---------------------+---+--+---+--+---+--+---+--+---+--+---+---+---+---- Name of note in vocal|do | re | mi | fa | sol | la | ti | do music | | | | | | | | ---------------------+---+------+------+------+------+------+-------+---- Treble clef. [Music] Bass clef. [Music] ---------------------+---+------+------+------+------+------+-------+---- International pitch | | | | | | | | of treble clef |261| 293.6| 326.3| 348. | 391.5| 435 | 489.4 | 522 ---------------------+---+------+------+------+------+------+-------+---- Scientific scale |256| 288 | 320 | 341.3| 384 | 426.6| 480 | 512 ---------------------+---+------+------+------+------+------+-------+---- Relative vibration | 24| 27 | 30 | 32 | 36 | 40 | 45 | 48 numbers | | | | | | | | ---------------------+---+------+------+------+------+------+-------+----