Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 77
ard-board bedivided into colored spaces, as in Fig. 19,and be made to rapidly rotate upon itsaxis, the colors, if pure, bleud into one -/another and produce white light. Simi- /larl^, impalpable powders of the differentcolors may be mixed together so as toappear white or grayish white. 177. The… … NEWTON S SPECTRUM. TABLE OF ILLUMINATING POWERS. 7X R 0 Y G B I V 94 640 1000 480 170 31 G 178. By placing delicate thermometers in the differently coloredportions of the spectrum and allowing them to remain untileach color had exerted its maximum effect, Herscliel discoveredthat the calorific rays…
Physics
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