. Elementary and dental radiography / by Howard Riley Raper . Figure 368.—X-ray tube with protection cathode collar. initial resistance in tubes of high vacuum. (3) To decrease uneven heat-ing at the cathode. Figure 370 is a type of valve tube differing inmechanical construction from Figs. 51 and 52. Avalve tube of this type is built into the X-ray tubeillustrated in Fig. 83. Some special feature, or combination tubes arenow being manufactured to operate particularly on Radiographic Units. These tubes may have builtinto them as an integral part any one or all of the following: (1) avalve (2) a
. Elementary and dental radiography / by Howard Riley Raper . Figure 368.—X-ray tube with protection cathode collar. initial resistance in tubes of high vacuum. (3) To decrease uneven heat-ing at the cathode. Figure 370 is a type of valve tube differing inmechanical construction from Figs. 51 and 52. Avalve tube of this type is built into the X-ray tubeillustrated in Fig. 83. Some special feature, or combination tubes arenow being manufactured to operate particularly on Radiographic Units. These tubes may have builtinto them as an integral part any one or all of the following: (1) avalve (2) a protection built of lead glass (3) a cylinder, through which UaloeCube. Combinationtubes. 338 APPENDIX the X-rays are directed on the part being radiographed, to cut outsecondary X-rays (4) a filter, consisting of a sheet of aluminum in thebore of the cylinder (5) a special vacuum-regulating device consisting ofa connection between the regulating chamber and the cathode end of. Figure .°.G0.
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