rotary switch
noun1
Business, Electrical, Electrical engineering, Electricity, Electromagnetism, Energy, Engineering, Natural sciences, Physical sciences, Physics A switch that is operated by turning a knob.
- 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.1961 October, “More programme machines for L.T. Northern line”, in Trains Illustrated, page 625, photo caption: