Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 685
block, and themovable arm is attached to it with a screw.Between the arm and the post-plate there shouldbe a small copper bur to make it work moreeasily. The arm is cut from a thin piece of hard 1116 THE PRACTICAL BOY. [Oct. sheet-brass or copper (tin or zinc will do verywell), and at the loose end… … FIG. 12. FIG. SWITCHES AND CUT-OUTS. Fig. ii shows a switch designed to carry thecurrent to one or the other of four lines, and inFig. 12 a switch to conduct to one of two lines.In Fig. 13 is shown a simple cut-out by whichone line may be cut out and another connected,and vice versa, by the same…
Children's literature
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