The Presence of Water Vapour in the Atmosphere of Mars

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Scientific paper

IN February and March, 1908, Mr. V. M. Slipher succeeded in photographing the lines due to water vapour in the atmosphere of Mars. It was in the ``a'' band that its presence stood revealed. The detection was rendered possible by the use of plates specially prepared by him for the purpose-23 Seed, bathed in a mixture of pinacyanal, pinaverdol, dicyanin, water, and ammonia-which enabled the spectrum to be photographed somewhat beyond the ``A'' band. Comparison spectrograms were made of the moon at approximately the same altitude on the same plates, and with exposures to give a like density for both. Repeated plates of the sort were taken, and their consensus shows unmistakably the ``a'' band stronger in the spectra of the planet than in those of the moon. In the case of the moon, of course, we are looking through our own atmosphere only; in the case of the planet, through its atmosphere as well.

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