The microscope; an introduction to microscopic methods and to histology (1917)
Gage, Simon Henry, 1851-1944 · [Ithaca, N.Y.] The Comstock Pub. Co. · leaf 125
ocusing up, the centralspot becomes very clear and the black ring very sharp. On elevatingthe tube of the microscope still more the center becomes dim, and thewhole bubble loses its sharpness of outline. § 196. Air bubbles with oblique illumination. — Remove thesubstage of the microscope and all… … Fig. 67. Oblique Illumination with aMirror and with a Condenser. A The light is shown to be oblique with ray c;rays A B are central. The arrows indicate thepath of the rays. (For the objective see explan-ation of fig. 35.) B Abbe condenser with an eccentric dia-phragm (D) admitting light only on…
Microscopy · Microscopy -- Technique
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