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Scientific American, Vol. 45, No. 24 (1881) (1881)
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d two-and-two, with the commutator blocks, arrangement adopted by Mr. Edison, the field magnets which are made after the Gramme pattern. Figs. 2 pine forests, containing upward of 24,000,000,000 feet of a lie horizontal, as shown in our engraving, instead of being superior quality of pine lumber,… … © 1881 SCIENTIFIC AMERICIAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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