The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 65
ced in sectional and in face views. Thediaphragm is placed between the mirror and the illuminator. In Fig. 49 the open-ing is eccentric for oblique light, and in Fig. 5/ the opening is a narrow ring, thecentral part being stopped out, thus giving rise to dark-ground illumination ($ 92). Obj. Obj.… … oblique rays will pass into the objective, hence as light reaches theobjective onty from the object, all the surrounding field will be darkand the object will appear like a self-luminous one on a dark back- Fig. 52. An Abbe Condenser in its mounting{The Bausch & Lomb Optical Company). ground.…
Microscopy
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