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 314
dizing when it is heated. Thisballast increases in resistance with an increase in tempera-ture, due to an increase in current and, as a result, automat-ically tends to maintain the current constant. A Nernst lampis shown complete in Fig. 245. 340. Vapor Lamp.—In the different forms of vapor lampthe… … Fig. 245 304 PRACTICAL APPLIED ELECTRICITY 341. Flaming Arc.—In the carbon arc lamp the greaterpart of the light is emitted from the ends of the intensely-heated carbons, the arc itself emitting only a pale violetlight. If the carbons between which the arc is formed beimpregnated with metallic…
Electrical engineering
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