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 68
Fig. 3,868.—Ninety degree or right angle arc lamp. With the 90° setting, the arc can be keptnearer in line with the center of the lenses for a greater length of time, without re-adjustingthe carbons, because of the horizontal carbon being placed in line with the principal opticalaxis and fed… … Figs. 3,869 to 3,876.—Bausch & Lomb diagrams illustrating the results of defective centering,that is, the shadows produced. Successful results in projection depend largely uponthe correct adjustment of the lamp, which must throw a brilliantly illuminated circle uponthe screen. After the…
Electrical engineering
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