. The microscope; a simple handbook. Microscopes. 120 THE MICEOSCOPE In the tubular portion connecting the lamp to the illuminator there are two slots into which colour screens, ground glass, or a focussing lens can be dropped, and a ground glass, a green glass, and a lens are supplied with the microscope for the --51' Fio. 111. -No. 3226, Metallurgical Bench Microscope with prism illumiaator and electric lamp and fittings. Petrological microscopes. A petrological microscope is essentially an ordinary microscope provided with a number of special adjustments and appliances for the stu
. The microscope; a simple handbook. Microscopes. 120 THE MICEOSCOPE In the tubular portion connecting the lamp to the illuminator there are two slots into which colour screens, ground glass, or a focussing lens can be dropped, and a ground glass, a green glass, and a lens are supplied with the microscope for the --51' Fio. 111. -No. 3226, Metallurgical Bench Microscope with prism illumiaator and electric lamp and fittings. Petrological microscopes. A petrological microscope is essentially an ordinary microscope provided with a number of special adjustments and appliances for the study of rocks and crystals. The most important of these additions are a polarising apparatus and a rotating stage. A polarising apparatus consists of a Nicol prism made of Iceland spar which must be placed below the object to be examined and a similar but somewhat smaller prism which must be placed above the object. At least one of the prisms and the object must be capable of rotation, and the amount of the rotation determined on a scale. There must be a means of rapidly throwing. 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 Beck, Conrad, 1864-. London, R. & J. Beck, Ltd.
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