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Chiroplast is an instrument to guide the hands and fingers of pupils in playing on the piano, invented by John Bernard Logier.[1]

The instrument placed the wrist, thumb and fingers of a hand above five consecutive white keys of a keyboard, to overcome the difficulty of retaining their proper position by beginners. It was patented on April 28, 1814, patent # 3806 "Apparatus for facilitating the acquirement of proper execution on the piano forte". The use of Chiroplast caused a good deal of criticism and controversy. [1]


  1. ^ a b A.F.C. Kollmann's Quarterly musical register (1812): an annotated edition with an introduction to his life and works, Ashgate Publishing, Ltd., Dec 15, 2008, ISBN ISBN 0-7546-6064-8, pp. 123-131