Peaks, Passes and Glaciers: A Series of Excursions by Members of the Alpine Club (1859)
Ball, John (Ed.) · Longman, Brown, Green, Longmans and Roberts (London) · leaf 215
cpap. ¥1.J NOTE. 193 Nore. The annexed rough diagram may make more clear the sug- gested explanation of the cause of the rosy glow seen in the higher Alps while the sun is below the horizon:—Let a B be a section of the earth’s surface, c and p mountains with a valley between them, and o ra stratum… … If we suppose the stratum of air between the mountains c and D, and bounded by the dotted lines ef and g h, to be charged with vesicular vapour of the precise degree of tenuity that gives the rose tint, it is clear that the rays reflected from the surface o Pp will reach it when the sun is a short…
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