Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 353
Fig. 278.—Huyghenian eye-piece. Fig. 279.—Kellner eye-piece. objective can stand, and as a rule even the centre of the field will notbear comparison in sharpness with the Huyghenian form. It is a suggestion of Mr. Nelsons that a crossed convex 6 : 1field-lens and a meniscus and concave-convex…
Microscopy
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