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 65
current arcs ? Ans. Two craters are formed and if the light from both is tobe used, a very careful setting and adjustment is necessary toavoid poor illumination and a double spot at the center of thescreen. MOTION PICTURES 2,719 Ques. What kind of carbon should be used for alter-nating current arcs… … NEGATIVE mmCARBON CONDENSER Fig. 3,860.—Stereopticon arc for direct current. This setting does not give as brilliant an arcas fig. 3,859, when a long arc is used, but for a short arc the carbons become so near thatan arc of more brilliancy than fig. 3,859 is obtained. Ques. In operation how is the…
Electrical engineering
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