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 285
es andthus produces long life. The upper bearing is only a guide bearing to keep the shaft ina vertical position, and is subject to virtually no pressure, and consequently little friction.It consists of a steel pin fastened to a removable screw and projecting down into a bush-ing in a recess… … INDICATING DEVICES 1,805 Ques. What is the objection to the commutator meter? Ans. The complication of commutator and brushes, and thefact that the friction of the brushes is likely to affect the accuracyof the meter.
Electrical engineering
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