Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 311
al. Tantalum is obtained by special processes from the ores tantalite and columbite, the tantalitebeing found principally in Australia and the columbite inNew England. Filaments of the desired size are drawn fromthe pure ductile tantalum. The melting temperature of tan-talum is approximately 2800°… … Fig. 243 ELECTRIC LIGHTING 301 hours it becomes very brittle, which is the great disadvan-tage of this kind of a filament. The filament of a tantalumlamp to operate on a 110-volt circuit is a great deal longerthan the carbon filament, and special means must be providedfor mounting those long…
Electrical engineering
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