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      Knowledge is Power

      Scientific American April 16, 1910

      Grooved Pulleys for Experimental Work

      • By Chauncey W. Nieman on April 16, 1910

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      More in the April 16, 1910 issue of Scientific American
      • Estimation of the Working Capacity of a Man Before and After an Accident
      • How Gamblers Cheat
      • Macrographic Examination of Metals, Big Fir Trees of the Northwest
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