The Desert; Further Stories in Natural Appearances
The Desert; Further Stories in Natural Appearances
Van Dyke, John Charles, 1856-1932
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It does something more. It acts as a prism and breaks the beam of sun- light into the colors of the spectrum. Some of these colors it deals with more harshly than others because of their shortness and their weakness. The blue rays, for instance, are the greatest in number ; but they are the shortest in length, the weakest in travelling power of any of them. Because of their weakness, and because of their affinity (as regards size) with LIGHT, AIR, AND COLOR 83 the small dust particles of the hi...gher air re- gion, great quantities of these rays are caught, refracted, and practically held in check in the upper strata of the atmosphere. We see them massed together overhead and call them the "blue sky. " After many millions of these blue rays have been eliminated from the sun- light the remaining rays come down to earth as a white or yellow or at times reddish light, dependent upon the density of the lower atmos- phere. Now it seems that an atmosphere laden with moisture particles obstructs the passage earth- ward of the blue rays, less perhaps than an atmosphere laden with dust.
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