The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 249
CH. VIII} PHOTO-MICROGRAPHY 233 nification produced by the projection ocular and increase the time ac-cordingly ; thus when the X4 ocular is used, the time should be atleast doubled over that when no ocular is employed. The time will bestill further increased if a color screen is used (§ 359).…
Microscopy
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