Tachometer
Title
Tachometer
Subject
Speed Measurements
Description
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 the Greek Ταχος, tachos, "speed", and metron, "to measure".
Source
Property of the W&L Physics & Engineering Department
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