Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 181
ld will not be darkened. 105. A greater degree of obliquity, suited to afford black-ground illumination with Objectives of larger angular aperture, may beobtained by the use of the Parabolic Illuminator* (Fig. 78); whichconsists of a Paraboloid of glass that reflects to its focus the rayswhich fall…
Microscopy · Biology
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