A Cylinder Reversing Switch
A cylinder reversing switch for small battery motors may be constructed cheaply, from a 3-in. length of broom handle and ¹⁄₂-in. boards, as shown. The four brushes are strips of copper. The contacts on the moving cylinder are eight brass tacks, connected as indicated in the diagram. The wires are insulated with paper where they cross. The handle is of heavy wire, and two tacks limit its motion, as shown. The method of connecting the switch is as follows, for either a series or shunt motor: Remove the two wires from the motor brushes, and connect the two middle brushes of the switch to the motor brushes. Connect the wires removed from the motor brushes to the outer brushes of the switch.—Claude Schuder, Sumner, Ill.