Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 315
an angle of 45° to theoptic axis ; opposite this speculum is an aperture in the tube forlight to enter. It will be understood by figs. 239 and 240, which re-present a longitudinal section of the nose-piece at C of the verticalilluminator at e, and of part of the objective at d. a is the aperturefor… … VERTICAL ILLUMINATOR—HOW To ISK IT 285 a condenser, and is brought to a focus on the object, which is tin-focus of the objective. The rays now proceed from the illuminatedobject once more, through the objective upwards, and pass throughthe central aperture in the speculum to the eye-piece and the…
Microscopy
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