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      Knowledge is Power

      Scientific American April 17, 1915

      Measuring One Twenty-Millionth of an Inch

      The Finest and Most Sensitive Measuring Instrument Known to Modern Science

      • By Ernst Keil on April 17, 1915

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      More in the April 17, 1915 issue of Scientific American
      • An Important Moving-picture Decision
      • Teaching Defective Children, Disinfecting Railway Cars
      • Development and Perfection of Schoop Metal Spray
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