Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 389
Fig. 308.—Illumination for dark ground (withstop beneath the condenser). regard- Fig. 307.—Image at the back of theobjective when daylight and a planemirror are used, course it will be understoodthat for the dark-ground re-sult a suitable stop is insertedbeneath the sub-stage con-denser. It has…
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