Text: An instrument said to have been incented in 1815 by Maelzel, for the purpose of measuring the realtive duration of the notes in a piece of music. The machinery is of clockwork, andthe various grades oftime are measured on a balance-rod serving the purpose of a pendulum, the speed being regulated by a shifting or sliding weight. To be correct the metronome should beat seconds whe nset at 60.

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Source: 125