. Elementary and dental radiography . CATHODE ANODE Fig. 43. A Bi-Anodal X-ray tube. REGULATING CHAMBER MOVABLEARM. feo B 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. TUBUS AND THE X-RAYS 47

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