. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. DISSECTING INSTRUMENTS. 345 wedge open certain closed parts without the risk of cutting them. Scissors in which the blades are curved, as shown at D or at E in fig. 227, are also very necessary. Cutting Forceps.—This instrument, the invention of Mr. William Valentine, is represented by C, fig. 227; the sides are rivetted at the end, as those of the ordinary forceps, but the cutting part consists of two scissor-shaped
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. DISSECTING INSTRUMENTS. 345 wedge open certain closed parts without the risk of cutting them. Scissors in which the blades are curved, as shown at D or at E in fig. 227, are also very necessary. Cutting Forceps.—This instrument, the invention of Mr. William Valentine, is represented by C, fig. 227; the sides are rivetted at the end, as those of the ordinary forceps, but the cutting part consists of two scissor-shaped blades, which over- lap each other, and are prevented from crossing over too far by a small steel pin, the blades are bent at an angle with the sides, and by this means the instrument can be very conve- niently employed for dissecting under a lens of half-an-inch focus. An instrument constructed somewhat after the same principle as the above, is known as the Microtome, the inven- tion of M. Straus Durckheim; it consists of two sides, like a pair of dissecting forceps, but each terminated by a scissor- shaped blade, arranged so that its cutting edge is perpendicular to the broad surface of the side; in order to prevent the blades from opening too wide, a screw with a fly nut is attached to one blade, and the other moves freely upon it; the screw is also provided with another nut situated between the blades, the latter may be adjusted so as to prevent the blades from being closed beyond a certain point, whilst the former serves to regulate the space that the blades may be kept open by the spring. The sides are not rivetted together as in the dissect- ing forceps, but are united by a hinge-joint, in order that they may be separated for the pui-pose of sharpening the blades. Spring Scissors.—These are represented by fig. 229, and. Fig. 229. consist of a pair of very small scissors, the blades of which are kept open by a spring, a. One of the handles is attached to a. Please no
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
