. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig- 33 Fig. 34 Figs. 33-34. Ocular Micrometer and movable scale. Fig. 33 is a side view of the ocular while Fig. 34 gives a sectional end view, and shows the ocular micrometer in position. In both the screw -which moves the micrometer is sho~wn at the left. (From Bausch elf Lomb Opt. Co. ) i 42. Spectral or Spectroscopic Ocular.—(See Micro-Spectroscope, Ch. VI). DESIGNATION OF OCULARS '/. 43. Equivalent Focus.—As with objectives, some opticians designate the oculars by their equivalent focus ( j 15 ). With
. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig- 33 Fig. 34 Figs. 33-34. Ocular Micrometer and movable scale. Fig. 33 is a side view of the ocular while Fig. 34 gives a sectional end view, and shows the ocular micrometer in position. In both the screw -which moves the micrometer is sho~wn at the left. (From Bausch elf Lomb Opt. Co. ) i 42. Spectral or Spectroscopic Ocular.—(See Micro-Spectroscope, Ch. VI). DESIGNATION OF OCULARS '/. 43. Equivalent Focus.—As with objectives, some opticians designate the oculars by their equivalent focus ( j 15 ). With this method the power of the ocular, as with objectives, varies inversely as the equivalent focal length, and therefore the greater the equivalent focal length the less the magnification. This seems as desirable a mode for oculars as for objectives and is coming more and more into use by the most progressive opticians. It is the method of designation advo- cated by Dr. R. H. Ward for many years, and was recommended by the committee of the American Microscopical Society, (Proc. Amer. Micr. Soc, 18S3, p. 175, 1884, p. 22S).. 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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