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      Knowledge is Power

      Scientific American August 28, 1915

      Safety Spurs for a Railroad Grade, The Current Supplement and more

      • By Harry Chapin Plummer on August 28, 1915

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      More in the August 28, 1915 issue of Scientific American
      • Artificial Immunity Against Typhoid Fever
      • Captive Balloons on the French Front
      • The Psychology of Baseball, Vividiffusion Experiments on the Ammonia of the Circulating Blood and more
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