Take two strips of copper or brass and fasten together by means of gutta-percha (Fig. 1); also provide them with a handle. Saw out a rectangular block about one and one-half times as long as the brass strips and fasten to it at each end two forked pieces of copper or brass, as in Fig. 2. Fasten on the switch lever, as at A and B, Fig. 2, so that it can rotate about these points. Connect the wires as shown in Fig. 3. To reverse, throw the lever from one end of the block to the other. --Contributed by R. L. Thomas, San Marcos, Tex.

Illustration: Simple Current-Reversing Switch