rotary switch

English

Noun

rotary switch (plural rotary switches)

(electrical engineering) A switch that is operated by turning a knob.
- 1961 October, “More programme machines for L.T. Northern line”, in Trains Illustrated, page 625, photo caption:
  A close-up of the very compact desk unit for control of the East Finchley programme machine from Leicester Square; the rotary switches at the top are used to set up the train number of any service to be added or cancelled.

References

“rotary switch”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

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