. Radiography and radio-therapeutics . thetube having meanwhile been lowered by the admission of the air. If desired, METHOD OF USING GUNDELACH REGULATOR 79 the Bauer valve may be worked with a long rubber tube, thus allowing ofregulation taking place from a distance, and while the tube is actuallyrunning. Gundelach Regulator.—Another very good regeneration apparatus maybe described. This arrangement consists of a little condenser which is made in theform of a cylindrical glass tube covered with an imperfect conductor ofelectricity. By special treatment this conductor is made to absorb a large
. Radiography and radio-therapeutics . thetube having meanwhile been lowered by the admission of the air. If desired, METHOD OF USING GUNDELACH REGULATOR 79 the Bauer valve may be worked with a long rubber tube, thus allowing ofregulation taking place from a distance, and while the tube is actuallyrunning. Gundelach Regulator.—Another very good regeneration apparatus maybe described. This arrangement consists of a little condenser which is made in theform of a cylindrical glass tube covered with an imperfect conductor ofelectricity. By special treatment this conductor is made to absorb a largequantity of gas. It is then covered with a second glass tube, and bothcylindrical glass tubes are so treated that they cannot be pierced by a spark. When the tube has become too hard, put the wire 6 of the regenerat-ing arrangement in contact with the metal cap d of the tube. The otherwire a has to be so far from the metal cap c that a shunt-spark passes. Thisshunt-spark should be half as long as the equivalent spark of the Rontgen. Fig. 63.—Gundelach tube with regenerator. (Siemens.)«, Wire. b. Wire. c, Metal cap. d. Metal cap. tube after regeneration, because the resistance of this regenerating arrange-ment is considerable. The current produces some gas from the substanceof the regenerating arrangement, and after a few minutes the tube willagain fluoresce regularly. The regeneration, however, is only completedwhen the shunt-sparks have ceased to pass. After regeneration turn backboth wires. This new regulator will work easily even when the resistanceof the tube has become so great that no electric current will pass throughthe Rontgen tube. This arrangement has the great advantage that owing to the two con-ductors being separated by a glass tube, the gas is set free uniformly fromall parts of the conductors, and the whole of the gas contained therein,which is considerable, can be utiUsed. In order to obtain good pictures it is generally necessary to regulatethe hardness o
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