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      Scientific American September 09, 1916

      The Pyranometer: An Instrument for Measuring Sky Radiation

      • By C. G. Abbot, L. B. Aldrich on September 9, 1916

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      More in the September 09, 1916 issue of Scientific American
      • Detections of Ions in the Atmosphere
      • Internal Combustion Engine Cycles—I
      • Essential Oils and Immunity
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