The compass of the Triple Harp, in general, is about five octaves, or thirty-seven strings in the principal row, which is on the side played by the right hand, called the bass row. The middle row, which produces the flats and sharps, consists of thirty-four strings; and the treble, or left hand row, numbers twenty-seven strings. The outside rows are tuned in unison, and always in the diatonic scale, that is, in the regular and natural scale of tones and semitones, as a peal of eight bells is tuned. When it is necessary to change the key, for instance, from C to G, all the Fs in the outside rows are made sharp by raising them half a tone. Again, to change from C to F, every B in the outside rows is made flat, by lowering it a semitone. When an accidental sharp or flat is required, the performer inserts a finger between two of the outer strings, and finds it in the middle row. Many experiments have been made, with a view of obviating the necessity of tuning the instrument every time a change in the key occurred. Brass rings were fixed near the comb, but those rattled and jarred; in short, every attempt failed until the invention of the Pedals. …