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Scientific American, Vol. 62, No. 8 (1890) (1890)
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current sufficiently describe them. One current alternates, or changes indirection Their two terminals are continually. The alternations may be 250 per second, rators. but vary greatly in different types. The other current is always in the same direction, though it may vary in pedestal. intensity… … © 1890 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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