. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 242 USE OF THE MICROSCOPE. of the circle the colours will be seen to change alternately from red to green, and from green to red, fig. 155, a' H c' d'. If the brass be slid along so as to bring the two largest aper- tures into focus, the images will overlap, and where they do so white light will be produced, as shown in fig. 154, 6' c'. rig. 155. The experiments may be varied by employing two double refracting crysta
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 242 USE OF THE MICROSCOPE. of the circle the colours will be seen to change alternately from red to green, and from green to red, fig. 155, a' H c' d'. If the brass be slid along so as to bring the two largest aper- tures into focus, the images will overlap, and where they do so white light will be produced, as shown in fig. 154, 6' c'. rig. 155. The experiments may be varied by employing two double refracting crystals, placed one over the other, and by removing the NicoFs prism, but retaining the brass plate on the stage; two distinct images will then be seen, but at twice the original distance from each other, as in fig. 156, a. If the crystal. Fig. 156. nearest the eye be turned from left to right, two faint images will appear; continuing the revolution, the four images will be equally luminous, and when the crystal has been turned round 90°, there will be only two images of equal brightness;. 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
