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An instrument for experimenting upon the mathematical relations of musical sounds. It consists of a single string stretched between two bridges, one or both of which are movable, and which stand upon a graduated rule for the purpose of readily changing and measuring the length of the part of the string between them.…

An instrument for measuring the harmonic relations of sounds. It is often a monochord furnished with movable bridges.

pet major (Mil.), the chief trumpeter of a band or regiment. -- Trumpet marine (Mus.), a monochord, having a thick string, sounded with a bow, and stopped with the thumb so as to produce the harmonic tones; -- said to be the oldest bowed instrument known, and in form the archetype of all others. It probably owes its n…