Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 234
the circle O R P was about 95° 20;they were colored like the primary rainbow; but the red wasnext the sun, and the other colors in the usual order. Thebreadths of all the arches were equal to one another, andabout a third part less than the diameter of the sun, as repre-sented in Jig. 136.; though… … other two at O and P were not so brisk. M and N had a pur-ple redness next the sun, and were white in the opposite parts.O and P were all over white. They all differed in their du-rations ; for P, which shone but seldom and but faintly, van-ished first of all, being covered by a collection of…
Optics
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