Wolferz, Alfred H. Formerly, Tachometer Systems Development Group, Weston Instruments Division, Daystrom Inc., Newark, New Jersey.
- Revolution counter
- Chronometric tachometer
- Centrifugal tachometer
- Vibrating-reed tachometer
- Impulse tachometer
- Eddy-current tachometer
- Velocity-head tachometer
- Electronic tachometer
- Electric-generator tachometer
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An instrument that measures angular speed, as that of a rotating shaft. The measurement may be in revolutions over an independently measured time interval, as in a revolution counter, or it may be directly in revolutions per minute. The instrument may also indicate the average speed over a time interval or the instantaneous speed. Tachometers are used for direct measurement of angular speed and as elements of control systems to furnish a signal as a function of angular speed.
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