The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 70
(See below. § 108). ADJUSTABLE WATER AND HOMOGENEOUS OBJECTIVESEXPERIMENTS I 102. Adjustment for Objectives.—As stated above (§ 24), the aberrationproduced by the cover-glass (Fig. 57), is compensated for by giving the combina-tions in the objective a different relative position than they would… … which the objective is capable by selecting covers of the thickness for which theobjective was corrected. (See table p. 14.) Adjustment maybe made also byincreasing- the tube-length for covers thinner than the standard and by shorteningthe tube-length for covers thicker than the standard (Fig. 5S).…
Microscopy
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