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      Scientific American September 14, 1878

      A New Method of Grinding Glass Specula

      • By Elihu Thomson on September 14, 1878

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      More in the September 14, 1878 issue of Scientific American
      • Photographic Engraving in Half-Tones
      • Sun Spot Screen for small Telescopes
      • The Metallurgy of Platinum
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