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      Knowledge is Power

      Scientific American April 07, 1906

      An Electric Micrometer for Measuring the Seventy-Millionth Part of an Inch

      By the English Correspondent of Scientific American

      • April 7, 1906

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      More in the April 07, 1906 issue of Scientific American
      • Curious Decomposition of Light
      • Some Notes on Fuel Briquetting in America
      • The Panama Canal and the Panama Railroad
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