. Elementary and dental radiography / by Howard Riley Raper . me is to move one cathode backso far that the cathode stream focuses before reaching the back of thetarget. (Fig. 57.) The high-frequency tube may be used to advantage on an inductioncoil which is generating a great deal of inverse current. The transformer tube is almost identical in con-transformer struction with the induction coil tube. It is, Cubes made to take a current higher in milliamperage andlower in voltage; that is, the target is thicker andthe metai sheath leading from it heavier to take up the heat due to
. Elementary and dental radiography / by Howard Riley Raper . me is to move one cathode backso far that the cathode stream focuses before reaching the back of thetarget. (Fig. 57.) The high-frequency tube may be used to advantage on an inductioncoil which is generating a great deal of inverse current. The transformer tube is almost identical in con-transformer struction with the induction coil tube. It is, Cubes made to take a current higher in milliamperage andlower in voltage; that is, the target is thicker andthe metai sheath leading from it heavier to take up the heat due to the useof the high milliamperage, and the vacuum is normally a little lower. X-RAY TUBUS AND THE X-RAYS 61 To avoid straining a tube, it should not be used again, after hav-ing been used till hot, until it has cooled thoroughly. Overheating thetube will destroy the gases in it, and so raise the vacuum to such a degreeas to make it impossible to force a sufficient milliamperage through it toproduce a sufficient number of X-rays, Sending a very strong current. Table, with S lead glass protection shield and compression cylinder. through a tube of low vacuum will also destroy the gases of the tube andspoil—strain—it. Fig. 58 is a tube rack for holding the tube when not in use. It is obvious that there must be some kind of a device for holdingthe tube when in use. This may be either a plain tube stand (Fig. 59),or a tube stand with a lead glass, protection shield and a compression 62 ELEMENTARY RADIOGRAPHY
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