. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ILLUMINATORS. 207 The bar, C, forms the centre upon which the diaphragm turns; it is provided with a spring and catch, the latter of which not only shows when an aperture is in its right place, but also indicates the number of the same. The condenser fits upon a square bar attached to the under surface of the stage by the screw D; it can be moved up and down and be made to traverse from side to side by the screw E. B
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ILLUMINATORS. 207 The bar, C, forms the centre upon which the diaphragm turns; it is provided with a spring and catch, the latter of which not only shows when an aperture is in its right place, but also indicates the number of the same. The condenser fits upon a square bar attached to the under surface of the stage by the screw D; it can be moved up and down and be made to traverse from side to side by the screw E. Beneath the cone of diaphragms are two milled heads, F G; the one at F is for the purpose of adjusting the front combination for thickness of glass upon which the object is placed, and that at G for clamping the entire condenser to the parts concerned in its Pig. 135. This instrument requires some considerable practice to bring out its powers, and at night is employed with a cam- phine lamp and reflector of peculiar construction; a more detailed description of it will therefore be given in the chapter on test 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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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
