. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 114 PRACTICAL TREATISE ON THE MICROSCOPE. other, to the outer one, b, is attached a flat plate, a, which slides underneath the stage, and is adjusted for distance by the screw, f; at c is seen a milled head, which is connected to a pinion, and by means of a rack attached, the inner tube, carrying the achromatic combination, d, is raised or depressed; the upper part of the outer tube, b, is larger than that at c, this
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. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 114 PRACTICAL TREATISE ON THE MICROSCOPE. other, to the outer one, b, is attached a flat plate, a, which slides underneath the stage, and is adjusted for distance by the screw, f; at c is seen a milled head, which is connected to a pinion, and by means of a rack attached, the inner tube, carrying the achromatic combination, d, is raised or depressed; the upper part of the outer tube, b, is larger than that at c, this is for the purpose of allowing the miUed ridge of the achromatic combination to pass up and down freely. For the low powers, such as the half and quarter of an inch, the com- bination, d, only is used; but with the higher powers, the second part, e, may be slipped over d, whereby the focal point of the illuminating rays will be materially lessened in dia- meter, although increased in brilliancy. The flat mirror is generally used as the reflector or the prism described in page 118. Wlien the compound body can be turned away from the stage, the adjustment of the axes of the illuminator and ob- ject-glass is a very simple matter, the only movement required in the condenser is that of either increasing or di- minishing the distance the flat plate, a, has to slide through; this is done either by screwing or unscrewing the screw, f, until the spot of light formed on the ob- ject by the illuminator is in the centre of the field of the object-glass. But when the compound body is a fixture, then it is neces- sary that the condenser should have two adjust- ments ; a section of such a condenser is represented by fig. 59, as constructed by Mr. Ross, a a exhibit Fig. 59. the plate by which it is. 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 rese