Treatise On Optics: New Edition With An Appendix, Containing An Elementary View of the ...
Treatise On Optics: New Edition With An Appendix, Containing An Elementary View of the ...
David Brewster
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9ABT III. the BUD, thoag^h, from the overpowering brightness of his rays, they are best seen when he is observed by reflexion from the surface of still water. In June, 1692, Sir Isaac Newton ob- served, by reflexion in a vessel of standing water, three rings of color round the sun, like three little rainbows. The colors of the first or innermost were blue next the sun, red without, and white in the middle between the bltie and red. The colors of the second ring were purple and blue within, and ...pale red without, and green in the middle. The colors of die third ring were pale blue within and pale red without The colors and diameters of the rings are more particularly given as fol- lows : — let Ring - Blue, white, red . Diameter, 5^ to 6^. 3d Ring . Pale blue, pale red • Diameter, 12P. On the 19th February, 1664, Sir Isaac Newtcxi saw a kalo round the moon, of two rings, as follows : — 1st Ring . White, Uuish green, yellow, red - Diameter, 3^ 9d Ring - Blue, green, red Diameter, 5^° Sir Isaac considers these rings as formed by the light pass- ing through very small drops of water, in the same manner as the colors of thick plates.
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