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      Digital & 4-Year Archive

      Scientific American July 05, 1919

      Acquired Radio-Activity

      Forty Years' Experiments with X-Rays, Cathode Rays, and Radium on Various Minerals

      • By William Crookes on July 5, 1919

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      More in the July 05, 1919 issue of Scientific American
      • The Strongest and Most Durable Fiber
      • Experimental Wireless Telegraphy and Telephony—I
      • Tower Clock Escapements
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