1851 Great Exhibition: Official Catalogue: Class X.: John and James Hopkinson
500. HOPKINSON, JOHN and JAMES, 18 Soho Square — Manufacturers.
Horizontal grand pianoforte with patent action, on an entirely new principle, giving increased power and certainty to the touch, and adding the tremolo similar in effect to that produced by the voice. Mata, inventor.
Rosewood boudoir pianoforte, 6 and 3/4 octaves.