A keyboard instrument; the smaller, quieter precursor to the pianoforte.
Zumpe's, or Masons, action drawn from the instrument of 1766. 1) key, 2) jack, a wire with leather stud on top, known by the workmen as the "old man's head", 3) whalebone rear guide, projects from the end of the key, works in a groove to keep the key steady, 4) hammer, 5) whalebone jack, called the 'mopstick', 6) damper, 7) whalebone damper spring