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
the light is very white and brilliant as compared with ordinaryincandescents. Life of lamp at this efficiency about 1,000 hours. 2,494 HAWKINS ELECTRICITY 1 ^CANc l£_ power^ £*. ?l*£ *2!r— Vj£ JOO 200 300 ^00 500 600 700 600 Fig. 3,434.—Life curves of tantalum lamps. These lamps operate at about…
Electrical engineering
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