. Elementary and dental radiography . regulators arc no longer in general use, because, withuse. they soon become too hard and must be sent back to the manufac-turers to be opened and re]:)umped. This is expensive and annoyin,^. Atul)e {00 high for use will SDnictinies drop in vacuum and regain itsformer usefulness if allowed to rest—remain unused—for a ukmuIi or so. There are different methods of regulating the methods of vacuum of X-ray tubes. The most popular and effi- RC()Ulatin9 cient is the one we shall now cc^nsider. Uacuum. TI1C \acuum is gtnerned bv means oi a movable arm. which incre
. Elementary and dental radiography . regulators arc no longer in general use, because, withuse. they soon become too hard and must be sent back to the manufac-turers to be opened and re]:)umped. This is expensive and annoyin,^. Atul)e {00 high for use will SDnictinies drop in vacuum and regain itsformer usefulness if allowed to rest—remain unused—for a ukmuIi or so. There are different methods of regulating the methods of vacuum of X-ray tubes. The most popular and effi- RC()Ulatin9 cient is the one we shall now cc^nsider. Uacuum. TI1C \acuum is gtnerned bv means oi a movable arm. which increases or decreases the distance be- 46 ELEMENTARY RADIOGRAPHY tween A and B, Fig. 44. This distance we shall call the tube-regulatingspark gap. The shorter the gap the lower the vacuum can be made; thatis, the shorter the gap the less perfect the vacuum can be made. The current enters the tube and, let us imagine, tries to pass fromanode to cathode. The vacuum in the center of the tube is more perfect REMOVABLEWIRE ASSISTANTANODE. CATHODE ANODE Fig. 43. A Bi-Anodal X-ray tube. REGULATING CHAMBER MOVABLEARM
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