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 35
d up with achromatic condensers (Fig.llj, carrjing revolving diaphragms, some of whose aper- 3 34 THE MICROSCOPIST. tures are more or less occupied by stops, or solid disks, soas to leave but a ring of space for light to pass through.The effect of these annular diaphragms is similar to anapparatus… … Websters Condenser, with Graduating Diaphragms. graduating diaphragm for the regulation of the centralaperture. This is a most useful accessory. (Fig. 12 ) Oblique Illuminators ■—Certain fine markings on trans-parent objects can scarcely be made out by central illumi-nation, but require the raj^s…
Microscopy · Histology · Microorganisms
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