. Elementary and dental radiography / by Howard Riley Raper . Fig. 44. X-ray tube with vacuum regulator. than around the walls. Hence the path of least resistance is through theregulating chamber, through the movable arm, through the tube-regu-lating spark gap, into the negative terminal tape; unless, of course, thetube-regulating spark gap is very wide. X-RAY TUBES AND THE X-RAYS 47. Fig. 45. Showing the manner of connecting the third terminal on the coil with the regulating chamber. The regulating chamber contains asbestos impregnated with somechemical, sodium or potassium hydrate, for examp
. Elementary and dental radiography / by Howard Riley Raper . Fig. 44. X-ray tube with vacuum regulator. than around the walls. Hence the path of least resistance is through theregulating chamber, through the movable arm, through the tube-regu-lating spark gap, into the negative terminal tape; unless, of course, thetube-regulating spark gap is very wide. X-RAY TUBES AND THE X-RAYS 47. Fig. 45. Showing the manner of connecting the third terminal on the coil with the regulating chamber. The regulating chamber contains asbestos impregnated with somechemical, sodium or potassium hydrate, for examples. When the currentpasses through the regulating chamber, heat is created, which causes thechemical to give off gases. These gases lower the vacuum of the that the current may pass directly from anode to cathode. When the 48 ELEMENTARY RADIOGRAPHY tube cools thoroughly—in the course of fifteen to thirty minutes—thesegases are taken up again by the chemicals in the regulating chamber,and the vacuum rises again. Thus the vacuum of the tube may be toohigh when the tube is not in use, but can be lowered to the desireddegree. Ordinarily the tube-regulating spark gap should be three CATHODESTREAM
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