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 404
the filament touching and short circuiting, which they will do inspite of anchor hooks. If the loops touch, they do not weld together asin the case of most other metallic filaments, but the lamp soon blackensalmost as it would do with an over-run carbon filament. The extreme rarity of the material,… … Fig. 3,437.—Tantalum filament which has been renewed. The tantalum lamp is not neces-sarily worthless as a lamp when the filament is broken or burned out. The wires oftencome in contact or can be brought into contact by jarring, thereby immediately weldingthem and reestablishing a circuit. Such a…
Electrical engineering
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