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 182
^ coil consists of 350 turns of No. 12 D.C.C.magnet wire wound upon a form w^hich will give the open-ing in the coil a diameter of 3 inches. The primary may … 3 ;—I L it
Electric apparatus and appliances
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