. The microscope; an introduction to microscopic methods and to histology. Microscopes. 104 MAGNIFICATION AND MICROMETRY [CH. IV eye or measured as if it were an actual object. For example, suppose the object were three millimeters long and its image on the ground glass measured 15 mm., then the magnification must be, 15-5-3 = 5, that is, the real image is 5 times as long as the object. The real images seen in photograph}- are mostly smaller than the objects, but the magnifica- tion is designated in the same way by dividing the size of the real im- age measured on the ground glass by the size
. The microscope; an introduction to microscopic methods and to histology. Microscopes. 104 MAGNIFICATION AND MICROMETRY [CH. IV eye or measured as if it were an actual object. For example, suppose the object were three millimeters long and its image on the ground glass measured 15 mm., then the magnification must be, 15-5-3 = 5, that is, the real image is 5 times as long as the object. The real images seen in photograph}- are mostly smaller than the objects, but the magnifica- tion is designated in the same way by dividing the size of the real im- age measured on the ground glass by the size of the object. For example, if the object is 400 millimeters long and its image on the ground glass is 25 mm. long, the ratio is 25-f-400=-11^-. That is, the image is j1,. th as long as the object and is not magnified but reduced. In marking negatives, as with drawings, the sign of multiplication is put before the ratio, and in the example the designation would be rth. MAGNIFICATION OF A SIMPLE MICROSCOPE § 156. The Magnification of a Simple Microscope is the ratio between the object magnified (Fig. 16, A'B'), and the virtual image (A3B3). To obtain the size of this virtual image place the tripod mag- nifier near the edge of a support of such a height that the distance from the upper surface of the mag- nifier to the table is 250 millimeters. Fig. 94. Tripod Magnifier. As object, place a scale of some kind ruled in millimeters on the support under the magnifier. Put some white paper on the table at the base of the support and on the side facing the Fig. 95. Ten Centimetei Rule. The upper edge is divided into millimeters, the lower into centimeters at the left and half centimeters at the right. Close one eye, and hold the head so that the other will be near the upper surface of the lens. Focus if necessary to make the image clear. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
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