John Weeks Moore

“ Whenever the bass note steps out of its place into that of the third of the key, this change is called the first derivative
When a sharp precedes or follows a figure, it signifies at the note which that figure represents, must be sharped. Another made of indicating the sharp, sometimes used, is by a stroke or dash drawn through the figure.
Another set of combinations, called Discords, are procured from the Chord of the Dominant Seventh, termed the CHORD OF THE SEVENTH. (See above.) ”

“ The following examples, with the chords filled up at length in notes, will be found simple and useful Persons, who have not the advantage of a master. will find themselves much assisted in their progress, by first writing out the figured basses and the top note., of each chord as here given, and then. ”