. The elements of vegetable histology. Plant anatomy. MICROSCOPE ACCESSORIES 215 Standardization of Ocular Micrometers. — In standardizing micrometers the tube length should be adjusted at 160 millimeters. Place the ocular microm- eter slip in the ocular so that it rests upon the dia- phragm of the latter. Place the stage micrometer on the stage and focus so that the rulings are clear. Move the stage micrometer slide and turn the ocular. Fig. 70.—Mechanical Stage. (Bausch & Lomb.) until the stage and ocular scales correspond and the end line of the ocular scale coincides with a line of the
. The elements of vegetable histology. Plant anatomy. MICROSCOPE ACCESSORIES 215 Standardization of Ocular Micrometers. — In standardizing micrometers the tube length should be adjusted at 160 millimeters. Place the ocular microm- eter slip in the ocular so that it rests upon the dia- phragm of the latter. Place the stage micrometer on the stage and focus so that the rulings are clear. Move the stage micrometer slide and turn the ocular. Fig. 70.—Mechanical Stage. (Bausch & Lomb.) until the stage and ocular scales correspond and the end line of the ocular scale coincides with a line of the stage micrometer ruling. Count the number of spaces of the stage scale covered by the entire number of ocular micrometer lines. Divide the number of stage micrometer lines covered by the total number of ocular scale divisions. The quotient equals the value in millimeters of each line of the ocular 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 Ballard, Charles William, 1887-. New York, John Wiley & Sons, Inc. ; [etc. ,etc. ]
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