. The microscope and microscopical methods. Microscopes; 1896. CH. //.] LIGHTING AND FOCUSING. 43 § 79. Proper Numerical Aperture of the Condenser.—As stated above, the aperture of the condenser should have a range by means of properly selected diaphragms to meet the requirements of all objectives from the lowest to those of the highest aperture. It is found in prac- tice that for diatoms, etc., the best images are obtained when the object is lighted with a cone which shall fill about three-fourths of the diameter of the back lens of the objective with light, but for histological and other pre
. The microscope and microscopical methods. Microscopes; 1896. CH. //.] LIGHTING AND FOCUSING. 43 § 79. Proper Numerical Aperture of the Condenser.—As stated above, the aperture of the condenser should have a range by means of properly selected diaphragms to meet the requirements of all objectives from the lowest to those of the highest aperture. It is found in prac- tice that for diatoms, etc., the best images are obtained when the object is lighted with a cone which shall fill about three-fourths of the diameter of the back lens of the objective with light, but for histological and other preparations of lower refractive power only one-half or one-third the aperture can be 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 Gage, Simon Henry, 1851-1944. Ithaca, N. Y. , Comstock
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