Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 368
ed out ina simpler manner. Abbes instrument is presented in fig. 286. It will be seen thatit consists of a flat cylinder of glass, about three inches in diameterand half an inch thick, with a large chord cut off SO that the portionleft is somewhat more than a semicircle ; the part where the… … Fig. 28(5.—Abbes apertometer. The microscope is placed in a vertical position, and the aperto-meter is placed upon the stage with its circular part to the frontand the chord to the back. Diffused light, either from sun or lamp,is assumed to be in front and on both sides. Suppose the lens tobe…
Microscopy
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