The microscope : its construction and management : including technique, photo-micrography, and the past and future of the microscope (1893)
Heurck, Henri van, 1838-1909 · London : C. Lockwood ; New York : D. Van Nostrand Co. · leaf 66
a one when the objectwas covered, and that the clear-ness of the image increased anddiminished, according to the thick-ness of the cover-glass. Toremedy this defect, which resultedfrom spherical aberration, Amiciconstructed his objectives in sucha manner that they could all beused with cover -… … Fig. 47- 46 THE OBJECTIVES. In this kind of objective, the two upper lenses (fig. 47, d) occupyan invariable position with regard to one another. They are fixedin a moveable tube, and can be made to recede from, or approach, thelower part, which is fixed, and carries the single or double…
Microscopy
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