Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 340
e practice of these simple tests will be most instructive tothose unfamiliar with the optical principles on which an objective isconstructed. They make plain that an over-corrected lens is onewhich brings its peripheral rays to a longer focus than its central.But a cover-glass produces… … vided with such means of correction, the eye-piece must be broughtnearer the objective, which will effect the same result.1 Still confining our consideration to the year 1S.°>7, we find thai nfurther improvement was made by Lister, who employed a triplefront combination. This consisted of two…
Microscopy
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