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      Knowledge is Power

      Scientific American September 23, 1893

      Handy Tables of Dimensions of Joists and Rafters for Common Purposes

      • By H. Maack on September 23, 1893

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      More in the September 23, 1893 issue of Scientific American
      • Extraction of Oils
      • Patents!
      • The Gas Engine as Applied to Electric Light Work
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