. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ACCESSORY INSTRUMENTS. 115 attached to the stage, b a portion of large tube, having affixed to it a ring of brass, into which is soldered a smaller tube carrying the pinion with a milled head, f; within this tube a still smaller one, d, with a screw at the top to carry the illuminator, g, and a diaphragm at the bottom, to cut off all ex- traneous light, is moved up and down by a rack, in which works the pinion, e. Th
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ACCESSORY INSTRUMENTS. 115 attached to the stage, b a portion of large tube, having affixed to it a ring of brass, into which is soldered a smaller tube carrying the pinion with a milled head, f; within this tube a still smaller one, d, with a screw at the top to carry the illuminator, g, and a diaphragm at the bottom, to cut off all ex- traneous light, is moved up and down by a rack, in which works the pinion, e. The vertical adjustment of this instrument is made by the small screw attached to the plate, a a, whilst all the other movements are effected by turning three or more screws in the ring of brass, by which the inner tube carrying the Ulumi- nator, can be moved in various directions, so as to bring its axis to coincide with that of the object-glass. Two of these screws are seen at c and d. This plan was first suggested by Mr. Koss, and is adapted to all his instruments in which the arm carrying the compound body is a fixture. The several parts of the illuminator, g, unscrew, so that they may be used either combined or separate. The achromatic condenser supphed with the largest micro- scopes of Messrs. Smith and Beck, is represented by figs. 60 and 61; and for the better exhibition of its several parts,. Fig. 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
