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 229
ng it back and forthuntil the surface is perfectly smooth. Then wipe off the commutator with a clean piece ofcloth or waste and lubricate with another clean piece moistened with oil and reset the brushes. 648 HAWKINS ELECTRICITY 1. Excessive voltage; 2. Excessive current; 3. Reversal of polarity of… … Fig. 724.—Method of smoothing commutator with a stone. The proper stone to use is madeout of white sandstone similar to that used for grindstones, but a trifle softer. It is dove-tailed into a holder, as shown in the illustration, and h«ld in place by a set screw. Whenbeing used, one knob is…
Electrical engineering
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