1. A type of switch that provides a continuous switching or sampling of a number of circuits by means of a radial-beam electronic tube or electronic switching circuit that reverses or exchanges the external connections in a transducer at a high rate of speed, and so it eliminates noise and wear.
2. An electron-tube or transistor circuit which switches one circuit connection rapidly and in sequence or following in an uninterrupted order to many other circuits, without the wear and noise of mechanical switches.

An example is the radial-beam tube, in which a rotating magnetic field causes an electron beam to sweep over one anode after another anode and produces the desired switching actions.