. The microscope; an introduction to microscopic methods and to histology. Microscopes. CH. IX] PROJECTION MICROSCOPE 259 microscope for focusing and for the best position of the specimen in relation to the other parts of the apparatus (§ 420.) The stage should be very Fig. 210. Fig. 210. Mechanical Stage of Leitz. (Cut loaned by IVm. Krajft, N. Y.) This has the advantage of having both milled heads at the side. It has the disad- vantage of not being readily attached to the stage of a projection microscope. § 415. Mechanical Stage.—For projection work this is almost a necessity. While
. The microscope; an introduction to microscopic methods and to histology. Microscopes. CH. IX] PROJECTION MICROSCOPE 259 microscope for focusing and for the best position of the specimen in relation to the other parts of the apparatus (§ 420.) The stage should be very Fig. 210. Fig. 210. Mechanical Stage of Leitz. (Cut loaned by IVm. Krajft, N. Y.) This has the advantage of having both milled heads at the side. It has the disad- vantage of not being readily attached to the stage of a projection microscope. § 415. Mechanical Stage.—For projection work this is almost a necessity. While one is demonstrating there should be no time and no energy wasted in finding the object. Preferably the milled heads of the stage should be at the side, and the stage should be easy to remove and put back into position. It should have sufficient range of motion to enable one to demon- strate any section on a slide of serial sections. § 416. Objective Carrier.—This like the stage should be on an independent support. There should be both fine and coarse adjust- ment. The tube should either be very short, or very large to avoid restricting the field. For projection oculars there must be an adapter for using them, and the adapter must be long enough to produce the proper tube-length ( 160 mm.). As with the stage the objective car- rier should be very substantial. § 417. Objectives to Use in Micro-Projection.—One rarely needs an objective lower than 100 mm. focus or higher than 3 mm. The majority of the work with a screen distance of 5 to 8 meters will be done with objectives of 60-75, 25~4°> 16, 8, 6 or 3 mm. focus. For the. 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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