encil mark to indicate the plane to whichthe focusing glass should be adjusted. the ground side of the focusing screen. If the uncovered part of thefocusing screen is too opaque, rub some fine oil on it ; only a little 196 PHO TO-MICROGRAPHY. \CH. VIII. should be used. The focusing screen as thus… … Fig. 151. Perie,raphic Objective of about go millimeters equivalent focus formaking photo-micrographs at a magnification of 2 to 15 diameters. It was foundto give the best results when used right end to as in ordinary photography. [Fromthe Gundlach Optical Co.) Fig. 152. Zeiss Anas-tigmat Objective…
Microscopy
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