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 405
n omitted. Tantalum Lamps.—The filament used in the manufacture ofantalum lamps is composed of the metal tantalum drawn intoa fine wire. This wire is wound back and forth over a support-ing framework which is fastened to the stem of the lamp as shownn the lamp cuts. In the lamps designed for 250…
Electrical engineering
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