Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 341
t obstructs 95 percent, of the heat rays. On the contrary aslice of obsidian or black mica obstructsnearly all the light radiations, but offers noimpediment to the passage of heat. The chemical influences of the prismaticrays are as varied as their heating powers. If we place a piece of… … very extraordinary peculiarities have beenobserved by Sir John Herschel and myself;but it will be sufficient for our present pur-pose to state the general features of theimpression. Some distance below the vi-sible red ray, the paper will be found quiteuncolored ; on the part where the red…
Photography · Art and photography
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