Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 37
34 . THE MICROSCOPE … Fig. 23.—No. 3295, High-power Dark-ground Illuminator. shows the optical portion of this illuminator. The light fromthe mirror being thrown upon the under-surfaoe of the glassreflector, the light is reflected by two curved surfaces so thata ring of light is focussed to a point upon the object at a…
Microscopy
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