Abstract
INSTRUCTIONS TO OBSERVERS.*—Spectroscopic Observations—Objects to be attained. THE objects to be attained are mainly the determination, so far as may be possible, of the chemical constitution of the chromosphere and of the coronal atmosphere; of the height to which the various vapours extend from the photosphere, and of the order in which they thin out. It is anticipated that the chromosphere, at all events, may be very rich in ultra-violet rays. The solar spectrum has already been photographically compared with metallic vapours from G some distance outwards. The operations, therefore, will be mainly photographic, glass being employed as little as possible to produce the necessary dispersion, and replaced by quartz. The attack is twofold, spectroscopes being used in conjunction with telescopes for obtaining line spectra, and prismatic cameras being employed for the purpose of obtaining images of the chromosphere and coronal atmosphere built up by the rays emitted by its various constituents. The prismatic camera will probably give the best results with regard to the height and order of the various layers, while the general nature of the spectrum beyond H, i.e. whether it is continuous, channel-spaced, or lined, will be best determined by the ordinary spectroscopes.
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English Government Eclipse Expedition, 1875. Nature 11, 351–353 (1875). https://doi.org/10.1038/011351a0
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DOI: https://doi.org/10.1038/011351a0
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