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Ta-chom′e-ter.

An instrument for measuring the velocity of moving bodies. Woltmann's, for measuring the speed of flowing liquids, has several spiral vanes on a shaft carrying an endless screw, which turns a series of geared wheels. On being placed in a current, the vanes assume a position perpendicular thereto, and their rotation actuates the clock-work mechanism which is graduated to indicate the velocity in miles per hour, or other units of measurement.

See speed-gage; speed-recorder; Veloci-meter, etc.

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