. Journal of roentgenology . place the images atsymmetrical positions to each side of the center of thetransparency plates. Procedure for making the plates for the hand stereo-scope: Place one of the stereo negatives in the kit (k);place the lens in its carrier (st) in the lens cell (lc); snapon the light at (L) and focus the image to proper size onthe ground glass (g); place the plate holder containing the314 x 7 plate in position behind (g); snap out the light at(L); remove plate holder shutter and expose by snappingon the light at (L) for the proper time, two to ten seconds,depending on the
. Journal of roentgenology . place the images atsymmetrical positions to each side of the center of thetransparency plates. Procedure for making the plates for the hand stereo-scope: Place one of the stereo negatives in the kit (k);place the lens in its carrier (st) in the lens cell (lc); snapon the light at (L) and focus the image to proper size onthe ground glass (g); place the plate holder containing the314 x 7 plate in position behind (g); snap out the light at(L); remove plate holder shutter and expose by snappingon the light at (L) for the proper time, two to ten seconds,depending on the density of the stereo negative and theintensity of the light used (at least a 100-watt nitrogenmazda); snap off the light; replace plate holder shutter;invert the lens in the lens cell; replace the first stereo neg-ative by the second in the kit (k), and repeat the aboveprocedure for the second exposure. Develop as an ordi-nary lantern slide and mount as described. Research Hospital USE OF THE HAND STEREOSCOPE — KNEER 341. EEDUCING CAMERA FOR MAKING LANTERN SLIDES ANDSTEREO-TRANSPARENCIES L, electric light control; k, set of kits for plates to be reduced; 1c, lenscell; Id, removable lid for lens cell; Is, lens carrier with lens mounted incenter for lantern slide reductions; st, lens carrier with aperture to one sideof center to receive lens when used for making stereo-transparencies; h, handstereoscope with frosted celluloid backing at c to diffuse the light over thetransparency; t, a stereo-transparency ready for the hand stereoscope. A ROENTGEN SECTION OF THE SOUTHERNMEDICAL SOCIETY FORMED One of the pleasing- indications of a general desire forextension of roentgen organization is the success of theroentgenologists in the South, in obtaining a section in theSouthern Medical Association. From a membership listof nearly 6000, Dr. Robert H. Lafferty of Charlotte, NorthCarolina, attempted to compile a list of men engaged in thisbranch of medicine. Resorting to the various med
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradiolo, bookyear1919
