EXPLANATION.-The broad central column represents the key of C. The columns at its right indicate those keys which require sharps for their signatures, viz.: G key (one sharp); D key (two sharps); A key (three sharps); E key (four sharps); B key (five sharps); and F key (six sharps). The columns at the left of the central (C) column, denote those keys which require flats for their signatures, viz. : F key (one flat); Bh key (two flats); Eb key (three flats); Ab key (four flats); Db key (five flats); and Gb key (six flats).

All black syllables and figures denote Diatonic Tones.

All colored syllables, figures, and characters denote Chromatic Tones.

All tones, the tendency from which is upward, are called sharp, and are here represented by red.

All tones, the tendency from which is downward, are called flat, and are here indicated by green.

To find the signature of a given key, compare its "black" tones (Diatonic Tones) with those in the central column (C or Modal Key), the point or points at which they differ being noted will give the desired signature: e.g., to ascertain the signature of the key of G, compare its diatonic tones (black) with those in the central column, when it will be found that they agree (black in both) at all points except 7 (ti), which, in the central column, is red. By glancing across to the last right-hand column it will be seen that the point of difference is F, which is the signature of the key of G.

N. B.-This Modulator is published in mammoth size (9% feet high by 7 feet wide) f and mounted on rollers, or made to fold, so that it can be carried in trunk or shawl-strap. rice 1, beral arrangements may be made by authors and compilers who would like to insert this miniature