. Elementary chemical microscopy. Microscopy; Microchemistry. Fig. 98. Revolving Nosepiece for Fig. 99 Dust-proof Revolving Three Objectives. Nosepiece. modate two, three or four objectives as the case may be. The better type is shown in Fig. 99. It is circular and almost dust- proof, while in the type shown in Fig. 98, if by chance the objectives are not turned under the shields dust falls upon the back lens combinations. Owing to the almost impossibility of constructing these nosepieces so that each objective will be properly centered when turned in place, many investigators pre- fer objecti
. Elementary chemical microscopy. Microscopy; Microchemistry. Fig. 98. Revolving Nosepiece for Fig. 99 Dust-proof Revolving Three Objectives. Nosepiece. modate two, three or four objectives as the case may be. The better type is shown in Fig. 99. It is circular and almost dust- proof, while in the type shown in Fig. 98, if by chance the objectives are not turned under the shields dust falls upon the back lens combinations. Owing to the almost impossibility of constructing these nosepieces so that each objective will be properly centered when turned in place, many investigators pre- fer objective "holders" or "changers'" instead of revolving nosepieces. Three forms of objective changers are illustrated in Figs. 100, 101 and 102. In the case of those of the form of Figs. 100 and 101 a flanged collar is attached to each objective. Pressing the levers together opens the clutch, and permits the objective with collar attached to be pushed in place. Upon releasing the levers the objective is seated and securely held. In the case of the £eiss device, Fig. 102, the objective is screwed into the sliding block b and is pushed into the slides in the plate. 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 Chamot, Emile Monnin, 1868-1950. New York, Wiley
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmicroscopy, bookyear1
