A single string stretched across a board or sound-board, under which a movable bridge can be moved at pleasure. By placing under the string a diagram of the proportionate lengths of string required for the production of just intervals, the ear can be trained and experiments can be made. It was anciently called, or rather, the results obtained from experiments with it, the harmonic canon. (Stainer, John; Barrett, W.A.; A Dictionary of Musical Terms; Novello, Ewer and Co., London, pre-1900)
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