Text: An invention by which sustained sounds can be produced on a pianoforte. In consists of a series of small hammers set into very rapid vibration by the winding up of a spring. When a note is struck and held down, the constant repetition of the blows of the hammer causes a continuous vibration ofthe string which is of a most charming character. A beautiful crescendo is obtained by the ingenious device of raising the hammers gradually further from the string, causing them to descend with more force. It was invented by Caldara of Turin in 1870.

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Source: 125