Tachometer | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-03

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Tachometer


00:00:51 1 History
00:01:25 2 In automobiles, trucks, tractors and aircraft
00:05:04 2.1 Traffic engineering
00:05:58 3 In trains and light rail vehicles
00:10:14 4 In analogue audio recording
00:12:46 5 See also



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SUMMARY
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A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine.  The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.  
The word comes from Greek ταχος (tachos "speed") and metron ("measure"). Essentially the words tachometer and speedometer have identical meaning: a device that measures speed. It is by arbitrary convention that in the automotive world one is used for engine and the other for vehicle speed. In formal engineering nomenclature, more precise terms are used to distinguish the two.