Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 686
-inch iron bolt, the wholeapparatus being about six inches long. Firstwind three layers of No. 24. cotton-insulatedwire, leaving about six inches of the wire pro-jecting from the spool at each end. Over thelast layer of this coarse wire wrap several thick-nesses of brown paper, and then wind… … FIG. 21.AN INDUCTION COIL. FIG. 22.A BOTTLE RESISTANCE. ends of the coarse wire will be connected tobinding-posts, as shown in E and F, and theends of the fine wire as shown at G and H. iii8 THE PRACTICAL BOY. [Oct. ELECTRIC BELLS AND BUZZERS. In order to get a shock from this coil, it willbe…
Children's literature
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