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      Scientific American August 24, 1872

      Letter from Professor R. H. Thurston - August 24, 1872

      • August 24, 1872

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      More in the August 24, 1872 issue of Scientific American
      • Answers to Correspondents - August 24, 1872
      • Direct-Acting Steam Engine
      • Recent American and Foreign Patents - August 24, 1872
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