. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 50 PRACTICAL TREATISE ON THE MICROSCOPE. ratus by means of which it may be supported and adjusted, making it, in fact, a single microscope; and as it would be foreign to our purpose here to enter into the details of the various contrivances which have been adopted, from time to time, we shall merely make mention of those useful in micro- scopical investigations. The mo9t simple, but not the least useful of the single
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 50 PRACTICAL TREATISE ON THE MICROSCOPE. ratus by means of which it may be supported and adjusted, making it, in fact, a single microscope; and as it would be foreign to our purpose here to enter into the details of the various contrivances which have been adopted, from time to time, we shall merely make mention of those useful in micro- scopical investigations. The mo9t simple, but not the least useful of the single microscopes, is represented by fig. 27. It is principally used by watchmakers and wood- engravers, and consists of a loaded stand, of metal or wood, from which rises a circular stem of stout wire or tube; upon this slides another piece of tube, carrying an arm also of stout wire, having at its end a ball and socket joint, and to the ball of this joint is attached a second smaller arm, to the end of which last, is fitted either a spring or else a ring, serving the purpose of carrying the lens; when the spring is used, the magnifier generally employed is the one the watchmaker adapts to his eye, it is represented by fig. 28, and is nothing more than a lens of an inch focus, set in a long cell of horn, enlarged at one end like a trumpet, this enables it to be grasped firmly by the muscles around the orbit, or if the ring be used, the lens may drop into it. The coarse adjustment is made by sliding the tube up or down the stem, whilst a finer adjustment is secured by means of the small arm and the ball and socket joint; but it will be seen that if this last be used, and the arm be moved into any other position than a horizontal one, the lens wiU not be in a plane at right angles. 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 res
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
