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Scientific American, Vol. 43, No. 17 (1880) (1880)
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was ism which moves the commutator brush of the small ma- filed October 4. 1878; the patent was granted August 10, 1880. The process of manufacturing carbon was paterited July 20, 1830. The dynamo ma- chine, in this manner regulating the excitation of the mag- chine was patented June 8, 1880. The… … © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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