Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 287
.I) is the optical part of the condenser placed immediately above thediaphragms and in oil-immersion contact with the base of the slide.The circular diaphragm is fixed into the inner tube attached to tlxsub-stage tube, C, just below the position of the arm A; the otherdiaphragm is screwed to it by… … Fig. 209.—Powell and Lealandschromatic oil condenser. Pig. lild. QUALITY OF ABBES ACHROMATIC CONDENSES 259 As we intimated above, Professor Abbe has now produced anachromatic condenser, ostensibly for use in high-power photographicwork, but in fact of much more general utility. It consists of a…
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