Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 51
Fig. 28. Porcelain Tube … Fig. 29. Resistance units. Fig. 31. units called resistors, which may be connected in series or inparallel as desired. Different types of resistance units are shownin Figs. 28 to 33. The unit shown in Fig. 28 consists of a length of wire woundon an iron tube, from which it is insulated by fireproof…
Electrical engineering
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