COMMA. A comma is a very minute interval of sound, the difference resulting from the process of tuning up by several steps from one note to another in two different ways. There are two commas.
The common comma is found by tuning up four perfect fifths from a fixed note, on the one hand, and two octaves and a major third on the other, which ostensibly produce the same note, thus—
or by multiplying the number of the vibrations of the...