Commutated-capacitor tachometer
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5-4-150
A rotary switch which alternately charges a fixed capacitor from a constant d.c. voltage source and discharges it through a fixed resistor. The average current through the resistor is proportional to the speed of rotation of the switch.
Reference: B.S.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)