The microscopist : a manual of microscopy and compendium of the microscopic science : micro-minerology, micro-chemistry, biology, histology, and pathological histology (1877)
Wythe, J. H. (Joseph Henry), 1822-1901 · Philadelphia : Lindsay & Blakiston · leaf 34
the stage. The gradual reduction of light can be accom-plished by the cylinder diaphragm, since when it is pushedup so as to be near the stage it cuts off only a small partof the cone of rays sent upwards by the concave mirror,but, when drawn downwards, it cuts off more. Collinss Graduating… … Culliiiss Nl-w (ji- (luating Diaphragm. Becks Ids Diaphragm is a further improvement of thissort. Coyidensers.—The loss of light resulting from the em-plojaiient of high powers has led to several plans for con-densing light upon the object. Sometimes a plano-convexlens, or combination of lenses, is…
Microscopy · Histology · Microorganisms
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