. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. VIII} PHOTO-MICROGRAPHY 229 For a horizontal camera it is frequently better to swing the mirror entirely out of the way and allow the light to enter the con- denser directly or after traversing the bull's eye (Fig. 174). If the object is small an achromatic combination like a Steinheil magnifier or an engraving glass is excellent (Fig. 175). When the light is satisfactory as seen through an ordinary ocular, remove the ocular. (A) Photographing without an Ocular.—After the removal of the ocular put in t
. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. VIII} PHOTO-MICROGRAPHY 229 For a horizontal camera it is frequently better to swing the mirror entirely out of the way and allow the light to enter the con- denser directly or after traversing the bull's eye (Fig. 174). If the object is small an achromatic combination like a Steinheil magnifier or an engraving glass is excellent (Fig. 175). When the light is satisfactory as seen through an ordinary ocular, remove the ocular. (A) Photographing without an Ocular.—After the removal of the ocular put in the end of the tube a lining of black velvet to avoid reflections. Connect the microscope with the camera, making a light-tight joint and focus the image on the focusing screen. One may make a light-tight connection by the use of black velveteen or more conveniently by the Zeiss' double metal hood which slips over the end of the tube of the microscope, and into which fits a metal cylinder on the lower end of the camera (Figs. 170, 176). In the first figure the connection has been Fig. 177. Zeiss' Achromatic Con- denser, c. s. c. s. Centering screzosfor changing the position of the condenser and making its axis continuous with that of the microscope. A segment of the condenser is cut away to show the combinations of lenses. For very low powers the upper lens is some- times screwed off. There is an iris diaphragm between the middle a?id lower combinations. (Zeiss' Catalog.). 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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