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High frequency apparatus, design, construction and practical application; a practical treatise for electrical engineers, electricans, physicians, students and experimenters (1920) Curtis, Thomas Stanley · New York, Norman W. Henley publishing company · leaf 104
ake a second oscillationtransformer in which the primary has five turns and thesecondary ten turns of copper ribbon. This coil may besimply constructed by winding up 15 turns of ^ in. copperribbon in a flat spiral with a strip of the corrugated paperbetween to insulate one turn from the other. The… … tj86 fi79 inelds tuniftQfl priaary Ufl© re=ftining t6n turni&8 secondary Coil for DArsonval currentsIs conposed of a spiral windingof copper ribbon in IS turns Fig. 43.—Coil for the production of DArsonval currents makes this perfectly clear. The coil may be sealed up in aflat wooden case with… Electric apparatus and appliances
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