Dulcitone
A dulcitone is a keyboard instrument in which sound is produced by a range of tuning forks, which vibrate when struck by felt-covered hammers activated by the keyboard. The instrument was designed by Thomas Machell of Glasgow in the 1860s, at the same time as Victor Mustel's organologically synonymous typophone, and manufactured by the firm of Thomas Machell & Sons during the late nineteenth and early twentieth centuries. Most of the early models are tuned to sharp pitch, or the diapason normal of a 435. Some of the late models use an action suspended on a system of leaf springs, which is considerably quieter than that illustrated. Description The dulcitone is a transposing instrument of the idiophone class; it sounds an octave higher than the standard (eight foot pitch) written pitch. It has a five octave written range from AA to a3 (sounding range from A to a4). A significant feature of the dulcitone was its portability, a product of its lightweight and compact construction and the fact that the tuning forks (unlike, for instance, the strings of a piano) were not prone to going out of tune. However, the volume produced is extremely limited, and the dulcitone's part is