Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 361
be made to sweep round inthe field, and thus permit each part of the central or peripheral zonesto be brought into play. Against the accurate value of this, again,the spherical aberration of an uncorrected condenser would stronglyoperate. Abbes Test-plate.—This test-plate is intended for the… … Fig. 283. The test-plate consists of a series of cover-glasses, ranging inthickness from 009 mm. to 0*24 mm., silvered on the under surface,and cemented side by side on a slide, the thickness of each beingmarked on the silver film. Groups of parallel lines are cut throughthe films, and these are so…
Microscopy
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