Spectrum of the Sunlit Auroral Rays

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IN a letter in NATURE of Dec. 21, 1929, Prof. Vegard criticised some researches which Moxnes and I had published in the issue of Aug. 17, 1929. In my letter I pointed out that the results obtained were only preliminary, and that the measurements of the intensities of the spectral lines were to be considered not as quantitative measurements, but only as qualitative indications of relative strength.

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