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tachometer

tachometer (tăkŏm´ətər), 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 Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 19 Jul. 2017 <http://www.encyclopedia.com>.

"tachometer." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (July 19, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/tachometer

"tachometer." The Columbia Encyclopedia, 6th ed.. . Retrieved July 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/tachometer

tachometer

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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"tachometer." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 19 Jul. 2017 <http://www.encyclopedia.com>.

"tachometer." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (July 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tachometer-0

"tachometer." The Oxford Pocket Dictionary of Current English. . Retrieved July 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tachometer-0

tachometer

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

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"tachometer." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 19 Jul. 2017 <http://www.encyclopedia.com>.

"tachometer." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (July 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tachometer-1

"tachometer." The Concise Oxford Dictionary of English Etymology. . Retrieved July 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tachometer-1

tachometer

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"tachometer." Oxford Dictionary of Rhymes. . Encyclopedia.com. 19 Jul. 2017 <http://www.encyclopedia.com>.

"tachometer." Oxford Dictionary of Rhymes. . Encyclopedia.com. (July 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tachometer

"tachometer." Oxford Dictionary of Rhymes. . Retrieved July 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tachometer