Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 231
on ourorgans, and these rainbows have therefore never been observed. JVlany peculiar rainbows have been seen and described. Onthe 10th August, 1605, a faint rainbow was seen at Chartres,crossing the primary rainbow at its vertex. It was formed byreflexion from the river. On the 6th August, 1699,… … ary bow D II E, and dividing it nearly into three parts. Dr,Halley observed the points F, G to rise, and the arch F Ggradually to contract, till at length the two arches F H G andF G coincided, so that the secondary iris for a great space lostits colors, and appeared like a white arch at the top.…
Optics
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