. Elementary and dental radiography / by Howard Riley Raper . of a transformer, a tne x-Kay oumt ■* Admitting of the Coohdge X-ray tube and an automatic time switch Rdiable Pontrol admits °f tne most perfect and reliable control, withthe least effort on the part of the operator. Suchan outfit is expensive. X-RAY TUBES AND THE X-RAYS APPENDIX TO CHAPTER III 331 X-Ray Cubes and the X-Rays Beginners in X-ray work seem unable to reconcile themselves toaccept the statement that the cathode stream passes from cathode totarget. See page 49. So let me emphasize the statement: The cathodestream flails
. Elementary and dental radiography / by Howard Riley Raper . of a transformer, a tne x-Kay oumt ■* Admitting of the Coohdge X-ray tube and an automatic time switch Rdiable Pontrol admits °f tne most perfect and reliable control, withthe least effort on the part of the operator. Suchan outfit is expensive. X-RAY TUBES AND THE X-RAYS APPENDIX TO CHAPTER III 331 X-Ray Cubes and the X-Rays Beginners in X-ray work seem unable to reconcile themselves toaccept the statement that the cathode stream passes from cathode totarget. See page 49. So let me emphasize the statement: The cathodestream flails in the opposite direction to the flow of the electricity throughthe tube. Recently it has been satisfactorily proved that the X-rays can bereflected. This is of only academic interest, however, since no practicaluse of the knowledge has so far been made. The operator back of a leadscreen, using a mirror to observe his tube and patient, must not think fromthis that the mirror will reflect the X-rays to him as it reflects the imageof the tube and Figure 364.—Coolidge X-ray tube. CoolidgeX-Ray Cube. other X-ray tubes. The new Coolidge X-ray tube (Fig. 364) builtby W. D. Coolidge in the research laboratory of theGeneral Electric Company, differs radically from all Uacuum Control. It differs from the ordinary X-ray tube describedin Chapter V so much that it is difficult to comparethe two. When the current will not pass through anordinary X-ray tube, as we wish it to, we lower the vacuum of the tubeby liberating gases in it, and we may then force a variable amount ofmilliamperage through it; depending on where we place the lever of the 332 APPENDIX X-ray machine rheostat. No current at all will pass through the Coolidgetube until the tungsten filament or coil (Fig. 365) is heated, and then notmore than a certain amount will pass through, regardless of how far thelever of the rheostat of the X-ray machine is advanced. The degree ofheat of the tungsten filament controls
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