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 61
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… … 54. (ieneral Blectric Commutator. V. Field trindings.—There are five methods of exciting the magnet whichin turn render magnetic the space or field in which the armature coils revolve:Permanent Magnets (fig. (•()), Separately Excited (fig. 56), Series (fig. 57), Shunt(fig. 5fS), and Compound…
Electric machinery · Searchlights · Coast defenses
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