Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 311
ll concave speculum reflecting directly down uponthem to a focus the light reflected up to it from the mirror ; it wasformerly much in use, but is now comparatively seldom employed.This concave speculum, termed a Lieberkiihn from the celebratedmicroscopist who invented it, is made to fit upon the… … Fig. 237. its light from a mirror beneath (fig. 237, A), the object must be somounted as only to stop out the central port ion of the rays that arereflected upwards. The curvature of the speculum is so adapted tothe focus of the objective that, when the latter is duly adjusted, therays reflected up…
Microscopy
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