1851 Great Exhibition: Official Catalogue: Class X.: John Champion Jones

481. JONES, JOHN CHAMPION, 21B Soho Square — Inventor and Manufacturer.
A double or twin semi-cottage pianoforte, having two fronts and sets of keys, one on either side, suitable for any number of performers, from one to six; case of walnut- tree. The letters of reference in figs. 1 and 2, indicate the position of corresponding parts in the front and side views of this twin pianoforte; a, b, c, representing the case; e, the keyboard; and g, g, g, the pedals.