Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 284
the focus of both optical com-binations that the edge of the clear image of the lamp-flame fallscentrally upon the object. Now move the object just out of thefield, remove the eye-piece and examine the back of the objective,and if the aperture of the aplanatic illuminating cone is greater thanthat… … Fig. 203. Fig. 204. Fig. 205. Fig. 200. we close the diaphragm so that the image of it just appears at theback of the objective, we are able to determine the aperture of theilluminating cone with that given opening in the diaphragm ; thusin fig. 204 it is a trifle less than -5 N. A. In a similar…
Microscopy
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