thumb|A drawing of a piano with a chiroplast installed on it, from French patent documents A chiroplast is an instrument to guide the hands and fingers of pupils in playing on the piano, invented and patented by Johann Bernhard Logier in 1814. The instrument was a device that 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.
thumb|A drawing of a piano with a chiroplast installed on it, from French patent documents A chiroplast is an instrument to guide the hands and fingers of pupils in playing on the piano, invented and patented by Johann Bernhard Logier in 1814. The instrument was a device that 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.
The instrument was a key part of Logier's system of teaching, which was one of the first to call for the teaching of multiple students at once. The use of the chiroplast caused a significant amount of criticism and controversy at the time, at least part of which was due to the heavy opposition to Logier's system by musicians fearing the loss of their students to centralized institutions teaching multiple students at once.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).