. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. I'll] TEST PLATE AND APERTOlfETER 187 trustworthy results. Differences in the thickness of cover-glasses of or mm. can be recognized with objectives of 2 or 3 mm. focus. " With oblique illumination the light must always be thrown perpendic- ularly to the direction of the ; Fig. 145. The Abbe Test Plate, lines covered by cover- thickness from ) to mm. 'lasses ranging m "The quality of the image outside the axis is not dependent on spherical and chromatic correctio
. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. I'll] TEST PLATE AND APERTOlfETER 187 trustworthy results. Differences in the thickness of cover-glasses of or mm. can be recognized with objectives of 2 or 3 mm. focus. " With oblique illumination the light must always be thrown perpendic- ularly to the direction of the ; Fig. 145. The Abbe Test Plate, lines covered by cover- thickness from ) to mm. 'lasses ranging m "The quality of the image outside the axis is not dependent on spherical and chromatic correction in the strict sense of the term. Indistinctness of the contours toward the borders of the field of view arises as a rule, from unequal magnification of the different zones of the objective; color bands in the peripheral portion (with good color correction in the middle) are caused by unequal magnification of the different colored ; " Imperfections of this kind, improperly called " curvature of the field," are shown to a greater or less extent in the best objectives, where the aperture is ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gage, Simon Henry, 1851-1944. Ithaca, N. Y. : Comstock Publishing Company
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