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 159
PARATUS connected with the contacts of the impedance switch on thecover of the cabinet. The object of this impedance is toreduce the amount of current flowing through the primaryof the transformer, when operation at full power is not de-sired. The impedance, furthermore, makes it possible toproduce… … Fig. 77. Method of mounting impedance coil connected in series, with the outside leads placed across theprimary supply wires and the neutral point grounded.This protective device can be purchased in the open mar-ket about as cheaply as it can be constructed by the ama-teur. Its use is absolutely…
Electric apparatus and appliances
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