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 66
ay be an open helix of bare cop-per bar, strip, ribbon, or tubing, or it may consist of a coilof heavily insulated cable. The secondary may be woundin a single layer upon a cardboard or wooden cylinder, orupon a wooden cage, or it may be wound in a series of nar-row layers on insulating paper or… … Fig. 17.—Wiring diagram for Oudin coil coil is in reality an auto transformer, /. r., its primary and. secondary are connected together at a neutral point which,in the case of high frequency apparatus, should begrounded. In the Tesla coil, the only connection between, the primary and the secondary…
Electric apparatus and appliances
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