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      Knowledge is Power

      Scientific American May 15, 1920

      Making a River Pump its Water Uphill, Talking to Thousands by Electrifying and Amplifying the Speaker's Voice

      • By Ralph Howard on May 15, 1920

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      More in the May 15, 1920 issue of Scientific American
      • Hoboes of Industry
      • Piercing the Catskills for Water
      • How Much Water do we Drink in the United States?, Scientific American Monthly for May and more
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