egative. Fig. 153. Focusing Glass. It is achromatic, con-sisting of a double convex crown lens and a negativemeniscus flint lens cemented together.1 It screwsinto the brass tube and is thus adjustable, enablingone to focus the pencil mark in the clear area of thefocusing screen [Fig. yjo) with… … § 338. Labeling and Care of Negatives.-of negatives is like that of ordinary negatives. -The care, printing, etc.,It is well to label them 198 PHOTO MICROGRAPHY. [CH. VIII.
Microscopy
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