. Interpretation of dental and maxillary roentgenograms . from that of the first exposure,so that the central ray will again converge at the samespot on the film (Figs. 34 and 29-C). In viewing films through the stereoscope the difficultyin mounting them so that identical objects in the twofilms will fuse readily is overcome by the following plan:a piece of glass is cut from an old 5x7 inch plate to asuitable size to fit the stereoscope •(4x7 inches). To thisare applied pieces of paper binding strip which have beenpreviously folded longitudinally so that only about one-third of the original wi
. Interpretation of dental and maxillary roentgenograms . from that of the first exposure,so that the central ray will again converge at the samespot on the film (Figs. 34 and 29-C). In viewing films through the stereoscope the difficultyin mounting them so that identical objects in the twofilms will fuse readily is overcome by the following plan:a piece of glass is cut from an old 5x7 inch plate to asuitable size to fit the stereoscope •(4x7 inches). To thisare applied pieces of paper binding strip which have beenpreviously folded longitudinally so that only about one-third of the original width of the gummed side is this manner two slots are formed into which the filmswill fit at approximately the proper distance apart. Thefilms are thus not mounted in absolutely fixed positions,but can be slid up and down and even slightly obliquely,so that they can be readily adjusted to such positions thatthe two images will merge when focused (Fig. 35). is a view of the ordinary hand stereoscope. It is not METHODS OF LOCALIZATION 73. Fig. 32.—Central position of the tube prior to making stereoscopic film exposures.
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectradiographydental
