tuning-fork piano

musical instrument

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In percussion instrument: The 19th century
…experiments with graduated sets of tuning forks struck by hammers from a keyboard produced the 19th-century “tuning-fork pianos,” the most noteworthy of which were different models of Victor Mustel of Paris from 1865 on. Graduated steel bars struck from a keyboard by piano hammers form the celesta, patented in 1886…
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