Method of determining pitch names in various keys and pitch name determining slide rule

Claim 1

A pitch name determining slide rule comprising an outer scale divided into two spaced sections, and a middle scale mounted between the spaced sections of said outer scale and slidable with respect thereto, said middle scale having a table including a standard pitch name line representing chromatic scales by whole tones and sharps, a first enharmonic line representing each pitch name of said standard pitch name line by an enharmonic including sharps, flats, and a double sharp, and a second enharmonic line representing each pitch name of said first two pitch name lines bY another enharmonic including flats, double flats, and a double sharp, said three lines being placed in a parallel relation and in register with each other, and the first enharmonic line being placed between the second enharmonic line and said standard pitch line, one of said sections of said outer scale having the same chromatic and enharmonic line table as that of said middle scale, and the other section thereof having a scale number index having various scale numbers inscribed thereon, said scale numbers being linearly spaced proportional to the musical intervals of various major and minor chords, whereby correct pitch notation is obtained together with correct absolute pitch in transposing music.