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      Knowledge is Power

      Scientific American April 25, 1908

      A Constant-Level Gas Meter

      How the Water Level Is Maintained

      • By G. Chalmares on April 25, 1908

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      More in the April 25, 1908 issue of Scientific American
      • Airships in War
      • Groynes of Reinforced Concrete to Check Coast Erosion
      • The History of Glass Making
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