Modern microscopy; a handbook for beginners and students (1912)
Cross, M. I, Cole, Martin J · Chicago, Chicago Medical Book Co. · leaf 115
at it should occupy in manipulation, and the propermethods of using it. One of the most largely used of condensers is a chromatic one,named the Abbe illuminator, originated by the firm of Carl Zeiss,and now supplied by nearly all opticians. It is made in twoforms, one having a numerical aperture of… … Fig. 33.—Abbe Illuminator. (l-20 N.A., Optical Paet.) power objective, while with the lower powers, by removing thetop lens, good results can be obtained. Its price is low, but ithas the great disadvantage of not being achromatic, and havingso large an amount of spherical aberration as to be…
Microscopy
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