. Elementary and dental radiography / by Howard Riley Raper . Fig. 345. Anteroposterior view of a dry skull. The right sphenoid sinus, is filled with lead shot accuracy in mounting the radiographs for stereoscopic study is notnecessary though preferable. It is always expedient when making dentalLandmarks. stereoradiographs to place some landmark, such as an anchor clamp band or a wire, on the teeth. Know-ing then that the screw and nut of the clamp band are on the lingual orbuccal side, as the case may be, or that the wire is twisted on the lingualor labial side, as the case might be, we may d
. Elementary and dental radiography / by Howard Riley Raper . Fig. 345. Anteroposterior view of a dry skull. The right sphenoid sinus, is filled with lead shot accuracy in mounting the radiographs for stereoscopic study is notnecessary though preferable. It is always expedient when making dentalLandmarks. stereoradiographs to place some landmark, such as an anchor clamp band or a wire, on the teeth. Know-ing then that the screw and nut of the clamp band are on the lingual orbuccal side, as the case may be, or that the wire is twisted on the lingualor labial side, as the case might be, we may determine immediately, when. Fig. 346. The reproduction here has lost much of its excellence. When the original negatives were viewed in the illuminating stereoscope, one could look as clearly and directly into the skull as he could into a soap bubble. The dark outline is the antrum nearer the observer filled with lead shot. (Stereoradiograph by A. M. Cole and Raper.) STEREOSCOPIC RADIOGRAPHY 3i3 observing the stereoradiograph, whether we observe the part from theposition of the tube or the position of the film. Dr. Kells states that, as a general proposition, a more perfect stereo-scopic effect may be gained if the radiographs are mounted so that thestereoradiograph is observed from the position of the film. This is true,and one reason for it is that, other things being equal, the closer an object
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