. Annual report for the year ended June 30 .... United States National Museum. ACCESSIONS 45. Magneto-electric generator made in 1832 or 1833, representing first use of a commutator, invented by A. M. Am- pere, for production of direct current. Cam on the vertical shaft caused con- tact to be made on the crossed strips of copper first in one direction, then in the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Unit
. Annual report for the year ended June 30 .... United States National Museum. ACCESSIONS 45. Magneto-electric generator made in 1832 or 1833, representing first use of a commutator, invented by A. M. Am- pere, for production of direct current. Cam on the vertical shaft caused con- tact to be made on the crossed strips of copper first in one direction, then in the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum. [Washington] : Smithsonian Institution
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Keywords: ., bookcentury1900, bookpublisherwashingtonsmithsonianinstitution
