The microscope; an introduction to microscopic methods and to histology (1899)
Gage, Simon Henry, 1851-1944 · Ithaca, N. Y., Comstock publishing company · leaf 68
°h-AU … 48. 49- 50. 5- Figs. 48-51. Sectional views of the Abbe Illuminator of 1.20 N. A. showingvarious methods of illumination (g S4). 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 slop…
Microscopy -- Technique
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