. Modern microscopy; a handbook for beginners and students, combining. Microscopy. 28 Modern Microscopy Three screws permit of any want of parallelism between the faces of the specimen being compensated for. To illuminate a specimen a vertical illuminator, the con- struction and use of which is referred to on page 105 and which may be fitted at either the eye or objective end of the body-tube, is employed. The lamp and bull's-eye have to be placed in fixed relation to this vertical illuminator, and it is important that once the illuminant is adjusted no more than a slight movement, such as wou
. Modern microscopy; a handbook for beginners and students, combining. Microscopy. 28 Modern Microscopy Three screws permit of any want of parallelism between the faces of the specimen being compensated for. To illuminate a specimen a vertical illuminator, the con- struction and use of which is referred to on page 105 and which may be fitted at either the eye or objective end of the body-tube, is employed. The lamp and bull's-eye have to be placed in fixed relation to this vertical illuminator, and it is important that once the illuminant is adjusted no more than a slight movement, such as would be imparted by the fine adjustment, should take place ; this renders obvious the utility of the rack-work for raising and lowering the whole of the mechanical stage. Other microscopes for the same. Fig. 12.—Holder foe Metalluegical "Woek. specific purposes are made by C. Keichert, of Vienna, and Queen and Co., of Philadelphia. The necessity for a special microscope for metallurgical work has, to a certain extent, been obviated by the introduc- tion of a carrier, which can be constructed to fit any ordinary microscope stage. It is shown in Fig. 12. The subject for examination is held between two jaws, which can be made to approach or recede from each other by means of ecrews, to which they are attached, the block of metal under examination is gripped between the jaws, and can be set at any desired angle. This is particularly useful where large surfaces are required to be gone over or where the face of a cylindrical piece of metal is to be inspected, the cylindrical portion itself being suspended through the aperture in the stage. The addition of the vertical. 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 Cross, M. I; Cole, Martin J. Chicago, W. T. Keener & Co.
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