. The microscope; an introduction to microscopic methods and to histology. Microscopes. 102 MARKERS AND MECHANICAL STAGES CCh. Ill. Fig. 6i. A Microscopical Speci- men WITH A Small Ring En- closing THE Part of Special Interest. area the desired object can be easily found on any microscope. The brush of the marker should be cleaned with 95% alcohol after it is used. (Proc. Amer. Micro. Soc, 1894, pp. 112-118). § 173. Pointer in the ocular. —This is a slender rod of some sort situated at the level of the real image in the microscope, and it appears with the specimen in the field of view. A point
. The microscope; an introduction to microscopic methods and to histology. Microscopes. 102 MARKERS AND MECHANICAL STAGES CCh. Ill. Fig. 6i. A Microscopical Speci- men WITH A Small Ring En- closing THE Part of Special Interest. area the desired object can be easily found on any microscope. The brush of the marker should be cleaned with 95% alcohol after it is used. (Proc. Amer. Micro. Soc, 1894, pp. 112-118). § 173. Pointer in the ocular. —This is a slender rod of some sort situated at the level of the real image in the microscope, and it appears with the specimen in the field of view. A pointer may be inserted in any ocular as follows: Remove the eye-lens and with a little mucilage or Canada Balsam fasten a hair from a camel's hair or other fine brush to the upper sur- face of the diaphragm (fig. 23-24) so that it will project about half- way across the opening. If one uses this ocular, the pointer will appear in the field and one can place the specimen so that the pointer in- dicates it exactly, as in using a pointer on a diagram or on the blackboard. It is not known to the author who de- vised this method. It is certainly of the greatest advantage in demonstrat- ing objects like amoebas or white blood corpuscles to persons not familiar with them, as the field is liable to have in it many other objects which are more easily seen. § 174. Mechanical stage. — For high school and ordinary laboratory work a mechanical stage is not needed; but for much work, especially where high objectives are used, a mechanical . stage is of great advantage. It is also advantageous if the mechanical stage can easily be removed. The one found on the most expensive American and English micro- scopes for the last twenty years and the one now present on the larger. 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
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