The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 64
he direction of apparent movement in focusing down CH. IT] LIGHTING AND FOCUSING 49 with reference to the illuminating ray ? What in focusing up ? If oneunderstands the experiment it may sometimes save a great deal of con-fusion. (See under testing the microscope for swaying with centrallight §… … Figs. 48-51. Sectional views of the Abbe Illuminator of 1.20 N. A. showingvarious methods of illumination (§ qo). Fig. 48, axial light with parallel rays.Fig. 49, oblique light. Fig. 50, axial light with converging beam. Fig. 51, dark-ground illumination with a central stop diaphragm. Axis. The…
Microscopy
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