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), 1833-1928 · New York : T. Audel & Co. · leaf 390
mtubes for purposes of illumination was described by Hauksbeein a treatise published about 200 years ago; but practical lampsof this class are among the most recent productions in the line oflight givers, the Moore and Cooper-Hewitt lamps being com-mercially available only since 1903. Their… … Fig. 3,409.—Connections of Cooper-Hewitt direct current mercury vapor lamp. It consistsof a glass tube A, and a small set of inductance and resistance coils B, connected in serieswith the tube. The latter is made of special glass, and carrieL an iron electrode at itsupper or positive end, and a…
Electrical engineering
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