. The American journal of roentgenology, radium therapy and nuclear medicine . he tube is a particular member attachedto the anode for the purpose of glowing outthe cathode or the cathodes by electronicbombardment during exhaustion. It is asmall piece of tantalum or molybdenumfoil (p, Fig. 3) indented on one of itsedges so as to provide a number of sharppoints and mounted on a 2 mm. wire, likea flag on its shaft. While evacuating thetube, the flag is facing with its indentededge the pointed end of the cathode. Byloading the anode negatively, an electronicdischarge is started, so that not only
. The American journal of roentgenology, radium therapy and nuclear medicine . he tube is a particular member attachedto the anode for the purpose of glowing outthe cathode or the cathodes by electronicbombardment during exhaustion. It is asmall piece of tantalum or molybdenumfoil (p, Fig. 3) indented on one of itsedges so as to provide a number of sharppoints and mounted on a 2 mm. wire, likea flag on its shaft. While evacuating thetube, the flag is facing with its indentededge the pointed end of the cathode. Byloading the anode negatively, an electronicdischarge is started, so that not only thepointed end, but also the shaft of the cath- A New Form of A-Ray Tube ode, including the small disc (d) receiveselectronic impact and may be heated up toany temperature required. After sealing,the tube is inverted and by gentle tappingthe flag is caused to slide back along theanode stem, where it is definitely fixed bya small metal clip (g) in which position itis represented on Figure 8. 20(f). Special attention has to be paid tothe evacuation, because a higher degree of. Fig. 8. exhaustion is required than in the case ofthe hot cathode tubes (4). For the purposeof improving the vacuum, especially toabsorb gases developed by the sealing ofthe tubes, a chamber (c, Fig. 9) can be pro-vided in which any metals fit for the purposemay be sputtered. The chamber consists of asmall bulb of 3 cm. in diameter, in which acathodically active point is mounted, facinga plane anode of the material to be sput-tered. While connected to the pump theelectrodes arc treated in the regular way,in order to set out as much as possible ofthe occluded gases. After sealing the tube, asufficient layer of sputtered stuff is pro-duced and since afterwards the electrodesare no longer to be used any more, the\ arecovered with protective caps. 21(g). I have not yet been able to deter-mine satisfactorily the electric properties—first of all the characteristic of the tube;a plant delivering a constant direc
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