Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 381
bon arc lamp does not go outwhen the current passes through the zero value, because thereis enough heat in the carbon tips to maintain the arc stream whilethe current reverses. Alternating-current arcs have no crater,and each tip is equally hot but is not so hot as the crater of adirect-current… … Fig. 424.—Light distribution of arc lamps. Fig. 425.—Shape ofdirect-current arc. 386. Flame Arc Lamps.—The positive carbon of the direct-current flame arc lamp and either or both carbons of the alter-nating current flame arc are impregnated with salts which havehigh selective radiation. Such salts…
Electrical engineering
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