Television receiver having single pole double throw rotary switch

Abstract From the Canadian patent

A single pole double throw rotary switch includes a non-conductive terminal board. A washer-like wiper element is rotatably secured to the terminal board by a tubular rivet. An outwardly extending portion of the wiper element selectively engages one of a pair of output terminals. When the wiper element occupies a midrange position the, rotary switch is electrically non-conductive. A non-conductive actuating member is rotatably mounted on the terminal board for positioning the wiper element. A raster centering circuit applies centering current having a DC component to a deflection yoke winding. Such single pole double throw rotary switch determines the direction of said DC component.