Other
Scientific paper
Aug 1929
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1929natur.124..263s&link_type=abstract
Nature, Volume 124, Issue 3120, pp. 263-264 (1929).
Other
Scientific paper
ON several occasions, especially during the great aurora of Mar. 22-23, 1920, I have looked at sunlit auroral rays through a pocket spectroscope and always found the green auroral line very faint as compared with other strong lines in the blue and violet (Résultats des mesures photogrammétriques des aurores boréales, etc., p. 48, Geof. Publik., vol. 4, No. 7). Wishing to obtain a more positive proof of this fact, I decided last winter to try to get spectrograins of these rays. I had already at my disposal some small kinema lenses of high light power and two glass prisms, one of which I had used with success to obtain prism objective photographs of aurora during my expedition to Bossekop in 1913. I was fortunate enough to get the most valuable assistance from Mr. Moxnes, engineer, attached to the physical institute of the University of Oslo. Two small spectrographs were built, one with greater dispersion but rather small light power, and the other with smaller dispersion but with very high light power.
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