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 409
mp. Iridium Lamps.—A lamp with a filament prepared fromfinely divided iridium has also been tried, but the rarity andhigh cost of this metal which like osmium is a by-product of the 2,500 HAWKINS ELECTRICITY platinum industry, would seem to forbid its commercial use.Its specific consumption is… … SIDE BASE CONTACT
Electrical engineering
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