Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 179
ncil ofalmost any degree of obliquitythat is permitted by the construction of the Stage may be readilyobtained ; but there is no provision for the correction of its aber-rations. In order to use this oblique illumination to the greatestadvantage, either the prism or the object should be made… … Amicis Prism. BLACK-GROUND ILLUMINATORS. 125- every azimuth in succession, so as to bring out all its markings(§145). 103. Black-Ground Illuminators.—When the rays are directedwith such obliquity as not to be received into the Object-glass atall, but are sufficiently retained by the Object to…
Microscopy · Biology
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