Volume 2: 1771 Edition of the Encyclopedia Britannica!
Harpsichord
Harpsichord, the most harmonious of all the musical instruments of the string-kind. It is played on after the manner of the organ, and is furnished with a set, and sometimes with two sets of keys; the touching or striking of these keys moves a kind of little jacks, which also move a double row of chords or strings, of brass or iron, stretched over four bridges on the table of the instrument.