. Elementary and dental radiography / by Howard Riley Raper . he disc end of the valve may be attached, witha piece of conducting tape, to the cathode side of the tube and the spiralend of the valve to the negative terminal tape of the coil. (Fig. 52.) shows a valve tube built into—i. e., as a part of—an X-ray tube. Tt is claimed by some that the valve tube acts only as an additionalresistance to the flow of the inverse current, cutting it out of the X-ray-tube in the same manner that the inverse spark gaps do. The fourth means of eliminating inverse from tubes is by what iscalled a mul
. Elementary and dental radiography / by Howard Riley Raper . he disc end of the valve may be attached, witha piece of conducting tape, to the cathode side of the tube and the spiralend of the valve to the negative terminal tape of the coil. (Fig. 52.) shows a valve tube built into—i. e., as a part of—an X-ray tube. Tt is claimed by some that the valve tube acts only as an additionalresistance to the flow of the inverse current, cutting it out of the X-ray-tube in the same manner that the inverse spark gaps do. The fourth means of eliminating inverse from tubes is by what iscalled a multiple inductance control on the induction coil. By means ofthis control, which is found only on the more expensive coils, the outputcurrent of the coil may be raised or lowered in voltage. If inverse isseen in the tube the voltage should be lowered. X-RAY TUBES AND THE X-RAYS 55 (bcillimctcr The oscillimeter or oscilloscope (Fig. 53) is aGeissler vacuum tube by means of which inverse cur-rent may be detected when the X-ray tube is covered with an opaque. Fig. 54. The Meyer penetrometer.
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