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      Scientific American April 24, 1915

      Saving Eight Million Tons of Coal a Year

      A Hydro-Electric Development That Uses a Head of 4,000 Feet

      • April 24, 1915

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      More in the April 24, 1915 issue of Scientific American
      • Longitudes by Wireless Telegraphy
      • The Sound Wheel, a Novel Wireless Detector, The Albessard Aeroplane and more
      • A Clock Built of Straw, Vacuum System of Gasoline Feed and more
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