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
NS ELECTRICITY The Audion Valve.—This valve was invented by De Forest in 1900,and is practically identical with the Fleming oscillation valve, thelatter being illustrated in fig. 2,086. Grisson Valve.—In this valve the cathode is a sheet of aluminum,and the anode, a sheet of lead, supported, in the…
Electrical engineering
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