. Elementary and dental radiography / by Howard Riley Raper . With a small chain, or any electric conductor, attachedto the metal of the tube-manipulating apparatus and the other end at-tached to a gas jet or water pipe the current will not jump an air gapinto the patient but will pass into the chain and through it to the gas orwater pipe, eventually reaching the earth possibly—hence the namegrounding. If the current jumps a small air gap into a patient a spark-occurs, due to the atmospheric resistance, and the sensation experiencedby the patient is very definitely unpleasant.) Figure 114 is,
. Elementary and dental radiography / by Howard Riley Raper . With a small chain, or any electric conductor, attachedto the metal of the tube-manipulating apparatus and the other end at-tached to a gas jet or water pipe the current will not jump an air gapinto the patient but will pass into the chain and through it to the gas orwater pipe, eventually reaching the earth possibly—hence the namegrounding. If the current jumps a small air gap into a patient a spark-occurs, due to the atmospheric resistance, and the sensation experiencedby the patient is very definitely unpleasant.) Figure 114 is, in results obtained, the same as the pose illustrated in MAKING DENTAL RADIOGRAPHS 121 Fig. in. In Fig. 114 an incline plane is used and the rays are directedstraight downward. A studied observation of Fig. 112 will reveal to the reader a hori-zontal shadow across the antra. If you will remove the skull cap from askull and look at the floor of the cranial cavity you will see that thisshadow represents the petrous portion of the temporal bone. The tube is. Fig. 111. Pose for making radiograph- of the Antra of Highmort tipped (Fig. 111) or an incline plane is used (Fig. 114) in order to throwthis shadow as far downward toward the teeth as possible. A straight-through lateral view of the antra may be made to locateforeign bodies in it. (Figs. 277 and 278.) Intra-oral radiography of the antra is not a succes?. (See Fig. on page 235 and 236.) Figure 276 was made from a pose similar to Fig. 108. One antrum. 122 DENTAL RADIOGRAPHY the one closer to the plate, is outlined with the dotted lines, the othermay be seen as the light area, to the readers left and a little above theoutlined antrum.
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