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      Scientific American August 21, 1915

      The Largest Hydraulic Motor, Photographic Determination of Stellar Parallaxes with the 60-inch Reflector of Mount Wilson Observatory and more

      • August 21, 1915

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      More in the August 21, 1915 issue of Scientific American
      • Recently Patented Inventions - August 21, 1915
      • A Notable Step in the Building of New York's Great Piers
      • Correspondence - August 21, 1915
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