Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 206
m of the separate tints,and the tints formed by the combination of the externa] friugi swill be equal to their difference. If the plates and their tintsare perfectly equal, the lines of equal tint will be circles. Thebeauty of these combinations can be understood only from col-ored drawings. When… … (6.) Spheres of glass, <$c. with an infinite number of axesof double refraction. (139.) If we place a sphere of glass in a glass trough of hotoil, and observe the system of rings, while the heat is passingto the centre of the sphere, we shall find it to be a regularsystem, exactly like that in…
Optics
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