The microscope; an introduction to microscopic methods and to histology (1899)
Gage, Simon Henry, 1851-1944 · Ithaca, N. Y., Comstock publishing company · leaf 220
ted together // screwsinto the brass tube and is thus adjustable, enablingone to focus the pencil mark in the dear area of thefocusing screen [Fig. 150) with great accuracy. It alsoserves to focus the image with ease and accuracy.The eye must not be too close to the upper end of thefocusing glass… … 198 PI 10 TO MICROGR A PHY. \CH. VIII.
Microscopy -- Technique
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