Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 239
rays passing through openings in the clouds, while the adjacent portions are obstructed by the clouds. The phenomenon of converging beams, which is of much rarer occurrence, is U2 ggm* 234 A TREATISE ON OPTICS. PART III. shown in fig. 139., where the rays converge to a point. A, asfar below the… … Mr IN the same time with the phenomenon of diverging beams, as ifanother sun, diametrically opposite to the real one, were belowthe horizon at A, and throwing out his divergent beams. In aphenomenon of this kind which I saw in 1824, the easternportion of the horizon where it appeared was occupied…
Optics
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