Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)
United States. War Dept · Washington, Govt. print. off. · leaf 59
THE DYNAMO. 45 (d) The bars of the commutator (fig. 54), of H. D. copper in.snlato(l by amber-colored mica, are siifiBcient in number to keep the P. D. between any t w< > adjacent,l)elo\v 10 volts. (() The bearings (fig. 55) are self-aligning, also self-oiling by means of revolv-ing rings on…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
