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- · New York, T. Audel · leaf 227
Figs. 719 and 720.—Bissell commutators. The segments are of hard drawn copper and areinsulated from each other and from the shell by mica. Ques. Should the commutator be run without anylubricant? Ans. In most cases it will be found that a little lubricantis needed in order to prevent cutting the…
Electrical engineering
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