. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. THE SIMPLE MICROSCOPE. 49. and, consequently, the aberration is trifling. This lens gives a large field of view, equally good in all directions, and it B A little matters in what position it is held, hence it is peculiarly applicable as a hand magnifier. The lens is generally set in silver or German silver, as represented by fig. 26, and the handle is so contrived, that it occupies but little room in the waistcoat po

- Image ID: PG442H
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. THE SIMPLE MICROSCOPE. 49. and, consequently, the aberration is trifling. This lens gives a large field of view, equally good in all directions, and it B A little matters in what position it is held, hence it is peculiarly applicable as a hand magnifier. The lens is generally set in silver or German silver, as represented by fig. 26, and the handle is so contrived, that it occupies but little room in the waistcoat po
Central Historic Books / Alamy Stock Photo
Image ID: PG442H
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. THE SIMPLE MICROSCOPE. 49. and, consequently, the aberration is trifling. This lens gives a large field of view, equally good in all directions, and it B A little matters in what position it is held, hence it is peculiarly applicable as a hand magnifier. The lens is generally set in silver or German silver, as represented by fig. 26, and the handle is so contrived, that it occupies but little room in the waistcoat pocket. It may be as well here to mention that many of the lenses sold as Coddington lenses are not constructed after this manner, but are made up of two convex lenses, not por- tions of spheres, hence they are destitute of many of the advan- '^' tages of the true Coddington lens. Another lens, somewhat of the same description as the Fig. 23. last, is much boasted of by its manufacturers, and is puffed off at every toy-shop as the Stanhope lens; it consists of nothing more than a double convex lens of great thickness, on one side of which the convex surface is greater than on the other; and when the most convex is turned towards the eye, an object placed upon the other convex sur- face is in the proper focus of the lens; it is, in consequence, generally used more as a toy. than as a philosophical instru- ment, for viewing the scales of butterflies' wings and other flat objects which can readily be attached to it, or for showing the eels in paste, and the wonders in a drop of water. If, how- ever, the flattest side be turned towards the eye, this form of lens may also be used as a magnifier, its focus being then from 1^ to ^ of an inch. When any of these lenses have to be held for a long time in the hand, much inconvenience wiU be felt, hence various stands or supports have been contrived by which the magnify- ing power may be kept in a fixed position over the desired object. The

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