Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 246
Figs. 2.0S9 and 2.090.—The De Faria valve. This is an aluminum lead rectifier. The cathodeis a hollow cylinder of aluminum placed concentrically in a larger cylinder of lead, andthe whole immersed in electrolyte of sodium phosphate in an ebonite containing vessel.Cooling is effected by promoting…
Electrical engineering
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