Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 349
t;z, 5, c, d: these spacescorrespond with the violet rays, and theu invisible chemical rays so called ; adark space exists between these band^,which mark the region occupied by the ex-treme violet rays, and the lavender rays ofSir John Herschel. If this action is allow-ed to continue during a… … Violet Indigo Blue Red amining the paper in the dark, almost thewhole surface appears luminous, the partsa, b, c, d, being the brightest, but thespace from the least refrangible violet tothe lowest edge of the red rajs is com-pletely dark. The upper part of the abovewood-cut shows the effect…
Photography · Art and photography
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