Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 157
on of those classes of objects which aresuitable for black-^rouud lUumuiation, and which are betterseen by Hght sent into them from every azimuth, than theyare by a pencU, however bright, incident in one directiononly, no more simple, convenient, and efficient means couldprobably be found, than… … Parabolic Illmmnator. PAEAIBOLIC ILLIJIillNATOE.—POLAIlIZDir& APPAEAirS. 135 disadvantageous by the great reduction in the amount of light,occasioned by the necessity for cutting-off of all the raysreflected from the paraboloid, which fall upon the objectTritliin the limits of then: angle of…
Microscopy
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