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      Scientific American November 24, 1894

      A Simple Way of Observing the Hardness of Water

      • November 24, 1894

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      More in the November 24, 1894 issue of Scientific American
      • A Ptomaine from Pleurisy Patients
      • Fusion and Volatilization Produced by means of the Heat of the Electric Arc
      • Pronunciation of Words in Singing
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