. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 364 PHYSIOLOGICAL PHYSICS. [Chap, xxvin. can be brought under the opening in the stage. It thus acts as a stop, and regulates the quantity of light, aiding in definition with high powers by cutting off the outside rays. Under the stage is fitted A66, a con- denser, an arrange- ment of convex lenses for concen- trating the light from the mirror on the object and so increasing the il- lumination. The form used in Zeiss's microscopes is
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 364 PHYSIOLOGICAL PHYSICS. [Chap, xxvin. can be brought under the opening in the stage. It thus acts as a stop, and regulates the quantity of light, aiding in definition with high powers by cutting off the outside rays. Under the stage is fitted A66, a con- denser, an arrange- ment of convex lenses for concen- trating the light from the mirror on the object and so increasing the il- lumination. The form used in Zeiss's microscopes is Abbe's, and can be removed or replaced at pleasure. It is specially serviceable for high powers. There are two. All focussing arrange- Fig. ments in such an instrument. The coarse adjustment is made by grasping ejge ^ ^Microscope (Zeiss's with finger and thumb of one hand , the other hand steadying the foot of the instrument, and, by means of a slightly turning movement, slowly moving t down or up the split tube as may be desired, thus bringing the lenses nearer to or taking them farther away from the object. The object having been brought into view, accuracy of definition is obtained by a slight turning, in one direction or in another, of the fine screw F, the fine Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son & co.
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