. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. Fig. 45. To determine this in any case, focus the object carefully, take out the ocular, look down the tube at the back lens. If less than three-fourths of the back lens is lighted, increase the opening in the diaphragm—if more than three-fourths, diminish it. For some objects it is advanta- geous to use the entire aperture, for others, less than three-fourths. Experience will teach the best lighting for special cases. Obj. Please note that these images are extracted from scanned page images that may
. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. Fig. 45. To determine this in any case, focus the object carefully, take out the ocular, look down the tube at the back lens. If less than three-fourths of the back lens is lighted, increase the opening in the diaphragm—if more than three-fourths, diminish it. For some objects it is advanta- geous to use the entire aperture, for others, less than three-fourths. Experience will teach the best lighting for special cases. Obj. 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 Publishing Company
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