. Elementary and dental radiography / by Howard Riley Raper . ence with X-ray tubes hastube to Buv taught him, when purchasing a new tube, never to buy one which backs up more than five inches parallelspark. One which backs up only three inches parallel spark, with use, willsoon be backing up more. But a tube which backs up more than fiveinches parallel spark when new will soon be backing up so much parallelspark—i. e., will soon have such a high vacuum—that the best dentalradiographic results cannot be obtained with it. APPENDIX Tu CHAPTER V making Dental Radiographs. Hew Pose for frontal, Th
. Elementary and dental radiography / by Howard Riley Raper . ence with X-ray tubes hastube to Buv taught him, when purchasing a new tube, never to buy one which backs up more than five inches parallelspark. One which backs up only three inches parallel spark, with use, willsoon be backing up more. But a tube which backs up more than fiveinches parallel spark when new will soon be backing up so much parallelspark—i. e., will soon have such a high vacuum—that the best dentalradiographic results cannot be obtained with it. APPENDIX Tu CHAPTER V making Dental Radiographs. Hew Pose for frontal, The advantage of having a well sectioned skull,ewmoidal, and max to the operator who wishes to do sinus work, can-illary Sinuses. not iJe overestimated. Before one becomes proficient in this work, experimentation on a skull is necessary. A comparatively new and most excellent pose for making antero-posterior radiographs of the frontal sinuses, ethmoid cells, and antra isillustrated in Fig. 372. Fig. 373 is a diagrammatic drawing explanatory of Fi< Fit. 372. Pose for frontal sinuses, antra and eth- moids. (Published by courtesy of Interstate Medical Journal.) SPHENOIDSINUS ETHMOIDCELLSFRONTALSINUS ANTRUM Fig. 373. Diagrammatic drawing ex-planatory of Fig. ..72. (InterstateMedical Journal.) Figure 374 is a radiograph made from the pose illustrated in and Fig. 375 is a diagrammatic drawing explanatory of Fig. 374. Figures 376, 377 and 378 illustrate poses forSphenoid Sinus. sphenoid exposures. mastoids. Figure 379 illustrates a pose for mastoid ex-posures. 34i 342 APPENDIX
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