One fourth of a Whole Tone, or step
Ramsay
"While vibrations are the sound-stuff, the protoplasm of notes, semitones are, as it were, the atoms of which music is composed. We may think and talk of quarter tones and commas, apotomes and skismas, and dots, but these have no place as intervals for the musical ear, nor any part in the compositions which so charm us of the great masters." [Scientific Basis and Build of Music, page 20]
See Also