Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 340
be detected, by examining the wholethrough a deep blue glass ; and, by throw-ing the spectrum upon a piece of yellowpaper, another ray appears at the violetextremity, named by Sir John Hersehelthe lavender ray. The original spectrum of seven bands ofcolor was examined by Sir Isaae Newton, 8152. The… … Since the days of Newton, until our owntime, this position had never been calledin question ; the seven rays were regardedas the primary colors of white light, andthe law of Newton received as truth uponhis authority. Sir David Brewster has,however, shown that this law will not standthe test of…
Photography · Art and photography
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