单词	barrel piano
释义	barrel piano noun : a mechanical piano that is operated by turning a hand crank which rotates a barrel-and-pin mechanism causing hammers to hit the piano strings A British patent was issued for a crude barrel piano, activated by pins on a large cylinder, in 1829. Edward Tenner, Our Own Devices, 2009 called also hurdy-gurdy, piano-organ, street piano Word History First Known Use 1859, in the meaning defined above
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