tachometer

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tachometer

tachometer , instrument that indicates the speed, usually in revolutions per minute, at which an engine shaft is rotating. Some tachometers, especially those used in automobiles, are similar in construction and operation to automotive speedometers . Other types, often connected directly to the shaft whose speed they indicate, are small electric generators whose output voltage is proportional to speed. This voltage is applied to a voltmeter whose dial is calibrated in speed units. Another type, used only with engines having an ignition system, operates by counting the pulsations of current or voltage in the ignition system, the number of these being proportional to the speed of the shaft.

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tachometer

The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

tachometer instrument for measuring speed. XIX. f. Gr. tákhos speed + METER.

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T. F. HOAD. "tachometer." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 16 Nov. 2009 <http://www.encyclopedia.com>.

T. F. HOAD. "tachometer." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (November 16, 2009). http://www.encyclopedia.com/doc/1O27-tachometer.html

T. F. HOAD. "tachometer." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved November 16, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-tachometer.html

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tachometer

The Oxford Pocket Dictionary of Current English | 2009 | © The Oxford Pocket Dictionary of Current English 2009, originally published by Oxford University Press 2009. (Hide copyright information) Copyright

ta·chom·e·ter / taˈkämitər; tə-/ • n. an instrument that measures the working speed of an engine (esp. in a road vehicle), typically in revolutions per minute.

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