. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig. 170. Turner-Reich anastigmat objective for pho- tography, ( Gundlach Opt. Co.) In the camera here fig- ured, the camera bed is ruled in centimeters so that the position of the ground glass can be determined with ac- curacy and noted. It takes but a moment to set the ground glass or focusing screen at the right level to give any desired size. In practice it is convenient to have attached to the camera a table giving the position of the ground glass for various sizes, and also the distance of the objecti
. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig. 170. Turner-Reich anastigmat objective for pho- tography, ( Gundlach Opt. Co.) In the camera here fig- ured, the camera bed is ruled in centimeters so that the position of the ground glass can be determined with ac- curacy and noted. It takes but a moment to set the ground glass or focusing screen at the right level to give any desired size. In practice it is convenient to have attached to the camera a table giving the position of the ground glass for various sizes, and also the distance of the objective from the object in each case. By having this information it takes but a moment to set the camera and to place it so that it will be approximately i n Fig. 170. Fig. 171. Zeiss anastigmat objective for photography, (Bausch & Lomb Opti- cal Co.) focus. The final focusing is then accom- plished by the use of the rack and pinion movement. It is an advantage to use a focusing glass and a clear focusing screen or the transparent part of the ordinary screen (Fig. 174), for the final focusing. As many objects have not sharp details which one can focus on, it is helpful to place some printed letters on the part to be brought out with the greatest sharp- ness. Of course these are removed before the exposure is made. , \ 339. In lighting the object one should take pains to so arrange it with ref- erence to the light that the details will show with the greatest clearness. Naturally for the vertical camera the light will come from the side and not from a skylight, although good results are obtained with a skylight if one so places the camera that it does not cast objectionable Fig. 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 compan
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