The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 24
ese the chromatic and the spherical aber-ration are both largely eliminated by combining concave and convex lenses of dif-ferent kinds of glass so disposed that their opposite aberrations shall correcteach other. All the better forms of objectives are achromatic and also aplanatic.That is the… … 12 MICROSCOPE AND ACCESSORIES \_CH. I wholly or nearly eliminated, and the curvatures are so made that the central andmarginal parts of the objective focus rays at the same point or level. Such piecesof apparatus are usually achromatic also. | 22. Apochromatic Objectives.—A term used by Abbe to…
Microscopy
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