The microscope; an introduction to the microscopic methods and to histology (1911)
Gage, Simon Henry, 1851-1944 · [Ithaca, N.Y.] The Comstock Publishing Company · leaf 76
ns of the objective, the field will appear dark (Fig. 57). If nowthe object is composed of fine particles, or is semi-transparent, itwill refract or reflect the light which meets it, in such a way that a CH, II] LIGHTING AND FOCUSING 57 part of the very oblique rays will pass into the objective,… … 54 55 56 57 Figs. 54-57. Sectional views of the Abbe Illuminator of 1.20 N.A. show-ing various methods of illumination ($ 101). FIG. 54, axial light with parallelrays. Fig. 55, oblique light. Fig. 56, axial light with converging beam.Fig. 57, dark-ground illumination with a central slop diaphragm.…
Microscopy
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