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 387
nt. The test for currentmay be readily made by putting an ammeter in series with the lamp, andallowing the lamp to burn for about five minutes. If the reading ofthe ammeter indicate a higher or lower amperage than that specifiedfor the lamp, the resistance of the lamp circuit should be increased… … Fig. 3,406.—Light distribution of alternating current and with inclined electrode. Case I,upper carbon positive. When the upper carbon receives a positive impulse the upper cratergives maximum illumination and the lower crater a comparatively small amount of light. should be made on each lamp so…
Electrical engineering
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