. Laboratory work in bacteriology. Bacteriology. CHAPTER VI. THE MICROSCOPE.âTHE HANGING DROP.âSIMPLE STAINING. In view of the fact that many of the students begin the study of bacteriology without any previous experience in the use of a microscope, it is very desirable to describe this instrument, and the manner in which it should be employed. It is customary to speak of simple, and of compound mi- croscopes. {The former consist, usually, though not neces- sarily, of a single lens, as in the case of an ordinary read- ing glass. In the simple microscope, the rays of light which enter the eye c
. Laboratory work in bacteriology. Bacteriology. CHAPTER VI. THE MICROSCOPE.âTHE HANGING DROP.âSIMPLE STAINING. In view of the fact that many of the students begin the study of bacteriology without any previous experience in the use of a microscope, it is very desirable to describe this instrument, and the manner in which it should be employed. It is customary to speak of simple, and of compound mi- croscopes. {The former consist, usually, though not neces- sarily, of a single lens, as in the case of an ordinary read- ing glass. In the simple microscope, the rays of light which enter the eye come directly from the â object, and a virtual image is produced. Fig. 15 illustrates the action of a simple mi- croscope. It should be observed that the object is between the principal focus P and , . , . â ^ -^ Fig. 15. Virtualimage,simple microscope(Carpenter). the lens. This figure also illustrates the action of the eye-piece in the compound microscope. If the object is placed beyond the principal focus (P), as in Fig. 16, a real image will result, and can be received on a screen. This corresponds to the action of the objec- tive in the compound rdicroscope. The compound microscope consists of two set of lenses, the objective and the eye-piece. The former is placed near the object, and gives rise to a real image (Fig 17 A B). This. 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 Novy, Frederick George, 1864- . Ann Arbor [Mich. ] G. Wahr
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