Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 128
AND MECHANICS FOR BOYS 657 a mile and a half in this manner, and some yearslater, telephone communication without wires wase.^tablished between points six miles apart. At a moderate outlay any one can, in a smallway, duplicate these simple wireless telephoneexperiments. We shall need about 300 feet… … ,\ .SHORT-DISTANCI-, WIKKLKSb TEI.ElHOXE mitter may be purchased from any electrical shopor mail-order house at a total cost of two dollars;or possibly a second-hand telephone set is avail-able from which these two parts may be removedin good condition. Make two large round coils of insulated…
Children's literature
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