The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 286
ploying the test as above described to-have brilliant illumination and to use an eye-piece of high power. When from practice the eye has learnt to recognize the finer differences inthe quality of the contour images this method of investigation gives very trust-worthy results. Differences in the… … Fig. 215. The Abbe Test Plate. The quality of the image outside the axis is not dependent on spherical andchromatic correction in the strict sense of the term. Indistinctness of the con-tours towards the borders of the field of view arises as a rule, from unequal mag-nification of the different…
Microscopy
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