Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 73
Fig. 32.—Illustration of the law of consequence for aplanatic systems. Let O and O* (fig. 32) be the conjugate aplanatic foci of a wide-angled system; u, TJ the angles of inclination of any two rays admitted 1 In the original translation of the papers of Professor Abbe from German intoEnglish the… … sin «=15 x,573 = ,86 = K.A. of objective.. Angular aperture ofobjective = 35° +35° = 70° in glass,,which is equiva-lent to the angularaperture of thecondenser = G0° +60° s= 120° in air. .■■ = l-0x-86 = 86. ix sin <//=l-0 x -8G = -8G = N.A. of condenser. Fig Al —Identity of n sin u (German math,…
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