International Library of Technology · Scranton, International Textbook Co. · leaf 381
hat the lower carbon is nearly always fixedand the arc maintained by allowing the upper one to movedownwards as the carbon is consumed. Fig. 11 shows a rather peculiar arrangement that is usedfor stereopticon lamps. Here the carbons are arranged at right angles to eachother. The lamp mech-anism… … 14 ELECTRIC LIGHTING. §18 allows the greater part of the crater in the end of B to beexposed. 16. Composition of Carbons.—Carbons used for ordi-nary open-arc lamps in America are composed principally ofpetroleum coke. This is made from the residue left fromthe distillation of petroleum. It is…
Electrical engineering
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