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Cristofori's big success was in solving, without any prior example, the fundamental mechanical problem of piano Click Here design: the hammer must strike the string, but not remain in contact with it (as a tangent remains in contact with a clavichord string) because this would sopping the sound.
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The oddball piece cast cruel frame was patented in 1825 in Boston by Alpheus Babcock, combining the load hitch pin plate (1821, claimed by Broadwood on behalf of Samuel Hervé) and resisting bars (Thom and Allen, 1820, but also claimed by Broadwood and ÃÂrard) |
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| Babcock later worked for the Chickering & Mackays firm who patented the first full insensible frame for eminent pianos in 1843 |
| Composite forged vein frames were preferred by myriad European makers until the American system was fully adopted by the early 20th century. |