. 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. 24. A square hole is made in the end of the handle of fig. 23, and a round one in the middle of that of fig. 24, for the pur- pose of attaching them to a stand, as wiU be subsequently shown. Mr. Smith generally puts three lenses into one handle, the highest power is a planoconvex, the next a crossed lens, and the lowest a double convex lens; these, when com- bined, perform uncommonly weU. When a higher magnifyin
. 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. 24. A square hole is made in the end of the handle of fig. 23, and a round one in the middle of that of fig. 24, for the pur- pose of attaching them to a stand, as wiU be subsequently shown. Mr. Smith generally puts three lenses into one handle, the highest power is a planoconvex, the next a crossed lens, and the lowest a double convex lens; these, when com- bined, perform uncommonly weU. When a higher magnifying power is required, the form generally used is that known as the Coddington lens, con- sisting of a sphere of glass, around the equator of which a triangular groove has been cut, and the groove itself subse- quently fiUed up with opaque matter, as represented in section by fig. 25. The great advantage of this form of lens is, that however obliquely pencils of light, B A, may fall upon it, they, like the central ones, pass at right angles with the surface,. 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
