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      Scientific American September 20, 1919

      A Spherometer of Precision

      An Attempt to Free the British Optician from the German Instrument Maker

      • By J. Guild on September 20, 1919

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      More in the September 20, 1919 issue of Scientific American
      • Colliery Shaft Sinking
      • Correspondence - September 20, 1919
      • Effect of Light on Living Organism
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