. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 140. Canada balsam, to secure the plumbago from being wiped out. The slip of glass thus prepared is placed in a thin brass frame, as shown in fig. 140, so that it may slide freely, and is acted. Vis. 141. Fig. 142. on at one end by a pushing screw, and at the other by a slight spring. Slits are cut in the negative eye-piece on each side, as shown in figs. 141 and 142, so that the brass frame, m, may be passed ac
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 140. Canada balsam, to secure the plumbago from being wiped out. The slip of glass thus prepared is placed in a thin brass frame, as shown in fig. 140, so that it may slide freely, and is acted. Vis. 141. Fig. 142. on at one end by a pushing screw, and at the other by a slight spring. Slits are cut in the negative eye-piece on each side, as shown in figs. 141 and 142, so that the brass frame, m, may be passed across the field in the focus of the eye-glass, the cell of which should have a longer screw than usual, to admit of adjustment for different eyes. The brass frame is retained in its place by a spring within the tube of the eye-piece. When the frame is not employed, an inner piece of tube, a, may be drawn across the slits so as to prevent dust from getting between the glasses. The method of using this micrometer is as follows :—the object is brought to the centre of the field by the stage movement, and the coincidence between one side of it and one of the long lines is made with great 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
