mark to indicate the plane to whichthe focusing glass should be adjusted. 2X 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- MICROGRA PH). [CM. VIII. should be used. The focusing screen as thus… … Fig. 151. Peri^raphic Objective of about go millimeters equivalent focus foimaking; photo-micrographs at a magnification of 2 to 1$ diameters. It zvas foundto give the best results when used right end to as in ordinary photography. (Promthe Gundlach Optical Co.) Fig. 152. Zeiss Anas-tigmat…
Microscopy
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