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      Digital & 4-Year Archive

      Scientific American February 12, 1921

      The Engineers of Ancient Egypt

      Mechanical Devices Used in Constructing Pyramids and Erecting Obelisks

      • By G. A. McWilliams on February 12, 1921

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      More in the February 12, 1921 issue of Scientific American
      • Correspondence
      • Pumping Coal from Mine to Seaboard
      • How we Think
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