. Exercises in bacteriology and diagnosis for veterinary students and practitioners. Bacteriology. APPENDIX I4S Any Huygenian ocular may, however, be used as a micrometer ocular by placing the ocular micrometer at the level of the ocular diaphragm, where the real image is formed. If there is a slit in the side of the ocular, and the ocular micrometer is mounted in some way, it may be introduced through the opening in the side. When no side opening exists, the mounting of the eye-lens may be un- screwed and the ocular micrometer, if on a cover-glass, can be laid on the upper side of the ocular
. Exercises in bacteriology and diagnosis for veterinary students and practitioners. Bacteriology. APPENDIX I4S Any Huygenian ocular may, however, be used as a micrometer ocular by placing the ocular micrometer at the level of the ocular diaphragm, where the real image is formed. If there is a slit in the side of the ocular, and the ocular micrometer is mounted in some way, it may be introduced through the opening in the side. When no side opening exists, the mounting of the eye-lens may be un- screwed and the ocular micrometer, if on a cover-glass, can be laid on the upper side of the ocular diaphragm. Obtaining the Valuation of the Filar Micrometer. — This microm- eter (Figs. 98-99) consists of a Ramsden's ocular and cross Filar Micrometer. As seen in Fig. 98 there are three lines. The horizontal and one vertical line are fixed. One vertical line may be moved by the screw back and forth across the field. For obtaining the valuation of this ocular micrometer an accurate stage micrometer must be used. Carefully focus the ^Jj mm. spaces. The lines of the ocular micrometer should also be sharp. If they are not, focus them by moving the top of the ocular up or down (164). Make the vertical lines of the filar micrometer parallel with the lines of the stage micrometer. Take the precautions regarding the width of the stage micrometer lines given in 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 Moore, Veranus A. (Veranus Alva), 1859-1931; Fitch, Clifford Penny, 1884-. Boston, New York [etc. ] Ginn and company
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