. Elementary and dental radiography / by Howard Riley Raper . Figure 370.—Valve tube. the tube, which connection is of the proper electrical resistance to carrythe right amount of electricity to keep the vacuum of the tube the principle, the connection between the tube-regulating chamber andthe cathode end of the tube is a tube-regulating spark gap which is set ata definite distance. As I have mentioned elsewhere (Chapter V) the X-RAY TUBES AND THE X-RAYS 339 tube-regulating spark gap may be set at a certain distance and left therewhile the tube is in operation. Since the resistance of
. Elementary and dental radiography / by Howard Riley Raper . Figure 370.—Valve tube. the tube, which connection is of the proper electrical resistance to carrythe right amount of electricity to keep the vacuum of the tube the principle, the connection between the tube-regulating chamber andthe cathode end of the tube is a tube-regulating spark gap which is set ata definite distance. As I have mentioned elsewhere (Chapter V) the X-RAY TUBES AND THE X-RAYS 339 tube-regulating spark gap may be set at a certain distance and left therewhile the tube is in operation. Since the resistance of the tube-regulatingspark gap, which is to be set while the tube is in operation, should be lessas the tube gets older, it is not quite right for manufacturers to claim thatthe special connection now under consideration makes the control of thetube absolutely automatic. When the tube is new its vacuum controlmay be automatic, but as it gets old manipulation (i. e., lessening of re-. Figure 371.—Hydrogen X-ray tube. sistance) of the special connection, between the regulating chamber andthe cathode end of the tube, becomes necessary. The greatest, or as Isee the thing, the only advantage of the special automatic ( ?) vacuumcontrol connection is that it admits of reduction of the vacuum of atube without any sparks occurring, as they do at an atmospheric tube-regulating spark gap. This is a definite advantage when the tube-regulat-ing spark gap is at the tube, for then there is no disagreeable sparking inthe vicinity of the patient, but is not an advantage if the tube-regulatingspark gap is on the X-ray machine. (See page 49.) 340 APPENDIX Figure 371 illustrates a type of tube known astubes ^le nydr°gen tuDe because the gas used to lower the vacuum is hydrogen. Some hydrogen tubes admitof regulation in either direction; that is, their vacuum may be eitherraised or lowered while others admit only a regulation of 371 shows the special device by means
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