micro sclerous (mikroskle rus)

[As micro sclere + -ous.] Having the character of a micro sclere. microsclerum (mi-krō-sklēʼrum), n.; pl. micro sclera (-rä). [NL.) Same as micro sclere. microscope (mikro-skōp), n. [= F. microscope = Sp. Pg. It. microscopio, eye, or enlarges the apparent magnitude of small visible bodies, so as to render po ible the examination of their texture or structure. The single microscope, which is the simplest form, is merely a convex lens, near to which the object to be examined is placed; it is also called a magnifying - gla or -lens (see magnifying-lens, under lens ). The compound microscope consists e entially of two lenses, or systems of lenses, one of which, the object-gla or objective, forms an enlarged inverted image of the object, and the other, the eyepiece or ocular, magnifies this image. The eyepiece and objective (see these words) are placed at the opposite ends of the tube or body, which is often made of two closely fitting 3 IMG:content-0603.jpg:[blocks in formation] have pa ed down through it are reflected by an an inverting prism up the obliquely placed tube to the eyepiece. This form is sometimes used in chemical work, when acid fumes are present.- Magnifying power of a microscope. magnify Monocular propeingle tube, for use with one eye only. - Pankratic microscope, a name sometimes given to a microscope having the eye S 8 P t ZZ Petrographical or Polarization Microscope (after Rosenbusch), sectional view. pp. fixed support in which tube ismod sun con adjustment g, screw of the fine adjustment; r, polarizer; , analyzer, in movable support turning on the graduated circle f f; T, 7, condensing lenses: 1, index for fixing position of rotating stage; 5, quartz plate, which slides hitose piece above biectivs through at of two centering objective. piece in a sliding draw (see 1).- Petrographical microscope, a form of microscope especially adapted for minute study of the structure of rocks. provided with a gradus ated and revolving stage and an arrangement for accurately centering the object-gla . It has also a polarizing apparatus, of which the upper nicol prism or analyzer is contained in a separate support which can be easily revolved on a graduated circle or removed at will. The lower nicol or po larizer is supported beneath the stage, and can also be revolved in a graduated collar. With these arrangements the directions of light-extinction in a section of a crystal can easily be determined. Besides the usual eyepiece and object-gla , an additional lens, or series of lenses, can be placed over the lower nicol prism when converging light is required, as in examining the uniaxial or biaxial interference-figures of crystal-sections. Re filecting microscope, a form of microscope in which the object is placed outside of the tube, or outside the axis of the tube, and reflects its image to the speculum by means of a plane mirror inclined at an angle of 45° to the axis of and oxyhydrogen microscopes, instruments in which the illumination em the former. - Solar, lucernal, IMG:content-0604.png:[blocks in formation]