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 403
Figs. 3,435 and 3,436.—Tantalum lamps. Fig. 3,435, round bulb 25 watt, 100-125 volt lamp;fig 3,436 elongated bulb 50 watt, 220-250 volt lamp. The Tantalum lamp burns in anyposition and in ordinary lighting causes little cr no trouble due to the strands of the fila-ment touching and welding. This…
Electrical engineering
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