Abstract
WATER VAPOUR IN THE MARTIAN ATMOSPHERE.—A glance at a print from a series of spectrograms taken by Mr. Slipher on January 15, which Prof. Lowell has kindly sent to Sir Norman Lockyer, leaves but little doubt that water vapour is present in the atmosphere of Mars. This print includes two spectra of the moon and one of Mars, and whilst the a band is absent from the former, it is quite a marked feature of the latter spectrum. The exposure for the spectrum of Mars was from 5h. 35m. to 8h. 30m., the mean altitude of the planet being 43°, whilst those for the moon were made at ish. 26m., the altitude being 30°; the aqueous vapour per cubic foot of air, during the exposures, was found to be 1-25 grains.
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Our Astronomical Column . Nature 77, 497 (1908). https://doi.org/10.1038/077497a0
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DOI: https://doi.org/10.1038/077497a0