. Elements of applied microscopy. A text-book for beginners. Microscopy. FUNCTION AND PARTS OF THE MICROSCOPE. n Hans and Zacharias Janssen, and supposed to date from about 1590. It is certain that a compound microscope was independently invented by Galileo in 1610, and that Cornelius Drebbel in Holland was credited with the introduction of the instrument about 1621. These early. Fig. 9.—^LEEtrwENHOEK's Microscope (Circa 1700). (After Carpenter-Dallinger.) instruments and their illuminating apparatus were cum- brous and unwieldy in the extreme (see Fig. 10). The compound microscope is characte
. Elements of applied microscopy. A text-book for beginners. Microscopy. FUNCTION AND PARTS OF THE MICROSCOPE. n Hans and Zacharias Janssen, and supposed to date from about 1590. It is certain that a compound microscope was independently invented by Galileo in 1610, and that Cornelius Drebbel in Holland was credited with the introduction of the instrument about 1621. These early. Fig. 9.—^LEEtrwENHOEK's Microscope (Circa 1700). (After Carpenter-Dallinger.) instruments and their illuminating apparatus were cum- brous and unwieldy in the extreme (see Fig. 10). The compound microscope is characterized by the fact that it contains two or more lenses or systems of lenses, one of which forms an image of the object, while the other forms a second image of the first image. The course of the rays in such an instrument is shown in Fig. 11. The object .4 jB lies outside the principal focus of the lens system marked Objective, and its real inverted image is formed at A^B^. This image is produced at a point inside the principal focus of the Ocular or Eyepiece; and the eye-. 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 Winslow, C. -E. A. (Charles-Edward Amory), 1877-1957. New York, J. Wiley; London, Chapman & Hall
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