Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 684
of the wire that proceeds to the bell orother piece of apparatus. SWITCHES AND CUT-OUTS. A simple switch (Fig. 10) is made from a pieceof wood for a base 3 inches long, 2 wide, and ^inch in thickness, and some small metal parts.It has but one contact point, that is the brass-headed tack T, driven… … FIG. IO. FIG. II. SWITCHES AND CUT-OUTS. arranged at one end ot the 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.…
Children's literature
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