The theory of the division of the octave, and the practic treatment of the musical systems thus obtained. Revise version of a paper entitled 'on just intonation in music with a description of a new instrument for the easy control systems of tuning other than the equal temperament of 1 divisions in the octave
The mode of expressing Intervals . In the original paper presented by the writer to the Royal Society logarithms were employed as the measure of intervals, as they have been commonly employed by others. Great advantages have been found, however, to result from the adoption of the equal temperament (E. T.) mitone, which is 1/12 of an octave, as the unit of interval. It is the unit most familiar to musicians, and has been found to admit of the expression of the theory of cyclical systems by means of formulæ of the simplest character. The writer therefore devised the following rules for the transformation of ratios into E. T. semitones and vice versâ , and subsequently found that De Morgan had given rules for the same purpose which are substantially the same (Camb. Phil. Trans, vol. x. p. 129). The rules obviously depend on the form of log 2. The form of the first e affords a little more accuracy than De Morgan’s.