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      Knowledge is Power

      Scientific American November 20, 1915

      Time Measured Graphically

      • By Frederic R. Honey on November 20, 1915

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      More in the November 20, 1915 issue of Scientific American
      • Electrifying the Philadelphia-Paoli Division of the Pennsylvania R. R
      • Recently Patented Inventions - November 20, 1815
      • The World's Largest Rapid Sand Filter, Dry Cleaning at Home and more
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