This instrument consists of a pear-shaped body, to which is added a curved neck supported on a front pillar or arm springing from the body, and therefore reminiscent of the harp. There are twelve catgut strings. The curved fingerboard, almost parallel with the neck, is provided with frets, and has in addition a thumbkey for each string, by means of which the accordance of the string is mechanically raised a semitone at will. The dital or key, on being depressed, acts upon a stop-ring or eye, which draws the string down against the fret, and thus shortens its effective length. The fingers then stop the strings as usual over the remaining frets. A further improvement was patented in 1816 as the British harp-lute. Other attempts possessing less practical merit than the dital harp were the lyra-guitarre, which appeared in Germany, at the beginning of the 19th century; the accord-guitarre, towards the middle of the same century; and the keyed guitar.