Dodge, Mary Mapes, 1830-1905 · New York : Scribner · leaf 565
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 BOV. iOcT. sheet-brass or copper (tin or zinc will do verywell), and at the loose… … 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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