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      Knowledge is Power

      Scientific American March 02, 1918

      The Evolution of Time-Marking Devices

      Some Simple Devices that Served Our Ancestors

      • By Percy Collins on March 2, 1918

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      More in the March 02, 1918 issue of Scientific American
      • Inducing Rain by Electricity
      • Photographic Printing Method
      • Treatment of War Wounds
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