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Tachometer

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Definitions of Tachometer

Pronunciation : Ta*chom"e*ter
Part of Speech : n.
Etymology : [Gr. -meter: cf. F. tachom?tre.]
Definition : Defn: An instrument for measuring the velocity, or indicating changes in the velocity, of a moving body or substance. Specifically: -- (a) An instrument for measuring the velocity of running water in a river or canal, consisting of a wheel with inclined vanes, which is turned by the current. The rotations of the wheel are recorded by clockwork. (b) An instrument for showing at any moment the speed of a revolving shaft, consisting of a delicate revolving conical pendulum which is driven by the shaft, and the action of which by change of speed moves a pointer which indicates the speed on a graduated dial. (c) (Physiol.) An instrument for measuring the velocity of the blood; a h?matachometer.
Source : Webster's Unabridged Dictionary, 1913

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