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      Knowledge is Power

      Scientific American August 29, 1914

      Investigations at the Cryogenic Laboratory at Leyden

      Conservator of the Physical Laboratory of the University of Leyden

      • By C. A. Crommelin on August 29, 1914

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      More in the August 29, 1914 issue of Scientific American
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      • On the Persistence in Superconductors of Electric Currents without Electromotive Force
      • The Flying Machine from an Engineering Standpoint—IV
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