Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 293
ctive index of which is 1-652. Thethickness of the flint being 034 inch makes the total thickness,when the two are cemented together, rather more than half an inch. The object of the flint glass is twofold. In the first place, itdisposes of three-fourths of the spherical aberration of a… … Fro. 214.—Stephensons catadioptricilluminator. As fig. 215 shows, rays which enter the Hint glass horizontally arereflected at the silvered surface of the crown-glass segment, andapertures are thus obtained ranging from 0*77 to 1*G44, N.A. inflint and 1*512 N.A. in crown. To obtain the smaller…
Microscopy
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