1851 Great Exhibition: Official Catalogue: Class X.: William Wheatstone and Co
526. WHEATSTONE, WILLIAM, and Co, 20 conduit Street, Regent Street — Patentees and Manufacturers.
Treble concertina, with 48 keys, for the performance of violin, flute, hautboy, or concertina music singly, or in concert; the same, displaying the whole internal mechanism.
Baritone concertina, with 48 keys, for the performance of harmonized music, especially psalmody, in the same register as sung by four voices.
A concert tenor concertina, with 43 keys, for vocal tenor, tenor violin, or wooden wind instrument music, singly or in concert.
A concert bass concertina, with 56 keys, for violoncello or bassoon music, singly or in concert; the same, of a smaller size, for the use of ladies.
Double concertina, with 50 keys, so disposed that a melody may be played by one hand, and an accompaniment by the other.
A symphonion, with a single vibrator, acted on by rollers moved by stops, so as to produce any note required.
A tonimeter, which produces any note in the chromatic scale merely by finger pressure.
An enharmonic tonimeter, which produces any sound in the enharmonic scale.
Portable harmoniums, for producing expression, which can be played alone, or be placed in front of the key-board of a pianoforte, and played by the same performer; adapted for wooden or stringed instrument solo, or part music.