Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 111
of an inch thick. They arc much largerthan A and B; and Mr. Herschel found that the line joiningthem was always perpendicular to a veined structure whichgoes through its substance. The distance of the red part ofthe image from C was found to be 16° 29,/ and the veinswhich produced these; colors… … these grooves at all angles, giving the whole surface muchthe appearance of a piece of twilled silk, or the larger wavesof the sea intersected with minute ripplings. The secondpair of nebulous images seen by transmission must arise froma veined structure exactly perpendicular to the first,…
Optics
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