Feb 1878
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1878natur..17..339d&link_type=abstract
Nature, Volume 17, Issue 435, pp. 339-340 (1878).
Physics
Scientific paper
ATTENTION having recently been directed by Dr. Schuster and Mr. Meldola, in connection with my discovery of oxygen in the sun, to the location of the oxygen, it may be of interest to allude to some experiments to determine the question by direct observation of the image of the sun spectroscopically. For this purpose I used a spectroscope furnished with a very fine grating on silvered glass given to me by Mr. Rutherfurd. This grating of 17,280 lines to the inch can be arranged to give a dispersion equal to twenty heavy flint glass prisms. The spectroscope was attached to my 12-inch Clark refractor, and I employed the full aperture of this telescope to produce an image of the sun on the slit. It did not seem practicable to use the spectroscope on the 28-inch Cassegrain reflector hi this research, because the tremulousness of the air was usually too great, the image of the sun being magnified to five inches in diameter. Even with the 12-inch refractor the occasions suitable for a critical examination are rare.
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