Royal Albert transposing piano

Royal Albert transposing piano *transposing piano with divided keys, the rear sections of which acted on the neighboring course of strings if desired. This system was invented by Sébastien Mercier, of Paris, who took out a British patent in 1844; the patent was worked by Robert Addison, who showed the piano at an 1851 exposition. A similar piano was patented in France in 1843 by Le Bihan of Carhaix, Finistère (92). Harding, Rosamund E. M. The Pianoforte. Cambridge, 1933.