. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig. 17S. Fig. 179. Fig. 17S. Leitz 64 millimeter ob- Fig. 179. Leitz /.? millimeter ob- jective for photography and for projec- jective for photography and for projection Hon ( Wm. Krafft, N. Y.) ( Wm. Krafft, N. Y.) Fig. 1S0. Zeiss' Apochromatic Projection Objective of jo mm. equivalent focus, for photo-micrography. (Zeiss' Catalog.) This, and another of 35 mm. focus, are designed for making pictures of moderate magnification. Usually rather large ob- jects are photographed with them. The object may he il
. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig. 17S. Fig. 179. Fig. 17S. Leitz 64 millimeter ob- Fig. 179. Leitz /.? millimeter ob- jective for photography and for projec- jective for photography and for projection Hon ( Wm. Krafft, N. Y.) ( Wm. Krafft, N. Y.) Fig. 1S0. Zeiss' Apochromatic Projection Objective of jo mm. equivalent focus, for photo-micrography. (Zeiss' Catalog.) This, and another of 35 mm. focus, are designed for making pictures of moderate magnification. Usually rather large ob- jects are photographed with them. The object may he illumina- ted in the ordinary way. They are used without an ocular, like a photographic objective. The one of 35 mm. is screwed into the tube of the microscope like an ordinary objective, but the one of jo mm. here shown, is, by means of a conical adapter, screwed into the ocular end of the tube, Pig. /So. For illuminating the object, any suitable light may be used, but it is recommended that the light be concentrated by means of a hull's eye or some form of combination like the engraving glass, and that the condenser be so placed that it focuses the light upon the objective, not upon the object. The object is then illuminated with a converging cone of light. § 351, Record of Negatives.—As indicated in § 341-343 each negative should have a record, see record blank on p. 219. On the negative itself should be also written the main facts with carbon ink. The name and magnification, date and any other details which may be thought desirable can be put on the envelope containing the negative, and then the negative stored like a catalog card as described above (§ 343)- PHOTOGRAPHING LARGE TRANSPARENT OBJECTS § 352. There are many large transparent objects which it is de- sirable to photograph, e. g., chick embryos mounted whole, large sec- tions of organs like the brain, etc. These must be photographed at a low Please note that these images are extracted from scann
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