A tonometer is a contrivance for the exact measurement of musical pitch. The original tonometer, invented by Scheibler, consisted of 52 tuning forks laboriously corrected by counting the beats and by comparison with the results obtained from the monochord, so as to provide an accurately tuned scale from any given pitch. Research Tonometer
In music, a monochord is an instrument used 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. Research Monochord
The trumpet marine is a monochord, having a thick string, sounded with a bow, and stopped with the thumb so as to produce the harmonic tones. It is said to be the oldest bowed instrument known, and in form the archetype of all others. It probably owes its name to its external resemblance to the large speaking trumpet used on board Italian vessels, which is of the same length and tapering shape. Research Trumpet Marine
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Abbreviations
Research Tonometer
