Modern microscopy; a handbook for beginners and students (1912)
Cross, M. I, Cole, Martin J · Chicago, Chicago Medical Book Co. · leaf 141
llumination, or to in-crease penetration when examiningobjects having several planes. Forphotographing opaque objects withlow powers it enables the appear-Fig. 54.—Daviss Shutter. ance of a small round object, such as a moths egg, to be taken quite sharply. A similar result has been attained by… … ACCESSORY APPARATUS 121 down the microscope-tube at the back of the objective, when theeyepiece is removed and a striated object is being examined. This iris diaphragm must have its aperture perfectly centraland the threads quite true. The aperture of the iris, whencompletely opened, should be as…
Microscopy
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