Siren Disk - Typical Numbers of Holes in Siren Disks

Typical Numbers of Holes in Siren Disks

The most common hole configurations are 6, 7, 8, 9, 10, 12, 15, and 16, a space, 24, 27, 30, 32, 36, 40, 45, 48, which give the following musical notes:

The last eight circles of holes give the following temperament of a major (Ionian mode) musical scale (divide each of the above number of holes by 24): 1, 9/8, 5/4, 4/3, 3/2, 5/3, 15/8, 2 (Ptolemy's intense diatonic scale).

The corresponding letters of the major scale given by the last 8 holes of the siren disk are C, D, E, F, G, A, B, C

A similarly generated minor scale can be made by making a siren disk having the following ratios of hole numbers: 1, 9/8, 6/5, 4/3, 3/2, 8/5, 9/5, 2. (just minor scale).

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