. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. MICROMETER. 215 by means of the small pushing screw that moves the slip of glass; the divisions are then read off as easily as the inches and tenths on a common rule. The operation, indeed, is nothing more than laying a rule across the body to be measured; and it matters not whether the object be trans- parent or opaque, mounted or not mounted, if its edges can be distinctly seen, its diameter can be taken. Previousl
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. MICROMETER. 215 by means of the small pushing screw that moves the slip of glass; the divisions are then read off as easily as the inches and tenths on a common rule. The operation, indeed, is nothing more than laying a rule across the body to be measured; and it matters not whether the object be trans- parent or opaque, mounted or not mounted, if its edges can be distinctly seen, its diameter can be taken. Previously, however, to using the micrometer, the value of the divisions should be ascertained with each object-glass, the mode of doing which will be subsequently explained more Fig. 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 Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ]
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