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      Knowledge is Power

      Scientific American May 13, 1911

      A Modern X-Ray Laboratory

      The Interrupter or “BreaK “

      • By Reginald Morton on May 13, 1911

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      More in the May 13, 1911 issue of Scientific American
      • Electrical and Chemical Effect of Ultra-violet Rays
      • The Chemistry of Inks in Handwriting
      • Fire and Burglar-Proof Safes.—I
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