Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 192
ce of the two thicknesses. Thus, if aplate Ty.th of an inch thick of right-handed quartz is combinedwith a plate Aths thick of left-handed quartz, the same colorswill be produced as if we used a plate T^ths of an inchthick of left-handed quartz. When the thicknesses are equal,the plates of course… … in the amethyst, I found that it possessed the power in thesame specimen of turning the planes of polarization bothfrom right to left and from left to right, and that it actuallyconsisted of alternate strata of right and left-handed quartz,whose planes rvere parallel to the axis of double…
Optics
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