Artificial intelligent assistant

tacho-generator

tacho-ˈgenerator
  (ˌtækəʊ-)
  [f. tacho(meter) generator s.v. tachometer 2.]
  An instrument that generates a voltage accurately proportional to the rate of rotation of a shaft or the like.

1952 Electronic Engin. XXIV. 382/1 Factors affecting the linearity of response with speed of d.c. tacho-generators. 1958 New Scientist 4 Sept. 751/1 One such piece of apparatus for keeping watch on the rpm of engines in flight is actuated by a small tacho-generator to measure the rate of rotation and communicate its warning if over⁓speeding occurs. 1976 Gramophone Sept. 510/1 Speed accuracy is controlled by a new system using a tacho-generator.

Oxford English Dictionary

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