1851 Great Exhibition: Official Catalogue: Class X.: Robert Addison
From Graces Guide
487. ADDISON, ROBERT, 210 Regent Street — Patentee and Proprietor.
A transposing pianoforte. This piano will transpose music five semitones higher or lower than the written key, if necessary. Its novelty consists in the key-board, hammers, and strings being immoveable. The internal action cannot be shifted or deranged. To make this intelligible, the first two bars of the National Anthem have been selected, which, if written thus can, by striking the same ivory keys as the above notes represent, be immediately transposed into three higher and three lower keys.
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