. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. IV] MACNIFICA TION AND MICRONETRY 117 (§ 60s), it will be remembered that it forms a real image on the ground glass placed on the top of the tube, and that this real image could be looked at with the eye or measurered 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 is 15-^3=5, that is, the real image is 5 times as long as the object. The real images seen in photography are mostly smalle
. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. IV] MACNIFICA TION AND MICRONETRY 117 (§ 60s), it will be remembered that it forms a real image on the ground glass placed on the top of the tube, and that this real image could be looked at with the eye or measurered 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 is 15-^3=5, that is, the real image is 5 times as long as the object. The real images seen in photography are mostly smaller than the objects, but the magnification is designated in the same way by dividing the size of the real image measured on the ground glass by the size of the object. For example, if the ob- ject is 400 millimeters long and its image on the ground glass is 25 mm. long the ratio is 25-=-400=Trr. That is, the image is yg- 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 is X T\r. In photog- raphy ( Ch. VIII) and when using the magic lantern and the pro- jection microscope the images are real, and may be measured on the screen as if real pictures. MAGNIFICATION OF A SIMPLE MICROSCOPE § 172. The Magnification of a Simple Microscope is the ratio between the object magnified (Fig. 16, A'B1), and the virtual. Fig. 105. Tripod Magnifier image (ASBS). To obtain the size of this virtual image place the tripod magnifier near the edge of a support of such a height that the distance from the upper surface of the magnifier to the table is 250 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 Gage, Simon Henry, 1851-1944. Ithaca, N. Y. : Comstock Publishing Company
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