Age of Great Inventions Images
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The Central Pacific Railroad Photographic Museum site maintains a page with several photos from the ceremony marking the completion of the transcontinental railroad in 1869. There are also scans of a few contemporary newspaper chronicles of the event.
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Thomas Edison, America's most famous inventor, with a set of incandescent bulbs.
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The cover of Edward Bellamy's famous utopian novel, Looking Backward: 2000 - 1887 (1895 edition) with Bellamy pictured.
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Alexander Graham Bell, inventor of the telephone, circa 1876.
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Andrew Carnegie's first steel mill, the Edgar Thompson Works in Braddock, PA, was among the first American mills to use the Bessemer blast furnace.
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Frederick Taylor, engineer and founder of scientific management, circa 1905.
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The Chicago Historical Society has a gallery of photos taken at the site of the 1893 Columbian Exposition.