tungsten, are the metals whose valency is closest to the mean valency of the chemical molecules constituting living tissues and more particularly those of human beings.  One might well seek to use this fact to explain scientifically the phenomena involved, but it is understood that the invention is not limited by any scientific explanation.  Concerning, on the other hand, the gas present in the apparatus at low pressure, the best results have been obtained with argon; the applicant has also obtained satisfactory, but slightly inferior, results with other gases of the rare gas series. 

              Surrounding the tube which constitutes the electromagnetic chamber are arranged: an electromagnet 13 with its winding 13a, placed at the level of the cathode, and the accelerating coils 14 and 15.  Other accelerating coils 14, 15 and 16 are similarly dispersed around the cavities 3, 5 and 8. 

              The two semi-circular boxes or "dees" 4a of the cyclotron 4 are placed in the usual manner between the poles of the frame around which are wound the accelerating coils 4b and 4c. 

              The magnetron 7 is of a familiar type and must be capable of emitting in the cavity 3 a centimeter wave of adjustable wavelength from 3 cm to 80 cm. 

              The lower portion of the tube 9, for acceleration and alignment, contains a cathode 17 resembling the cathode 11, with a filament 17a.  This cathode 17 is supported by a hollow pillar 18 pierced by holes 18a close to its junction with the bottom of tube 9.  This pillar 18 communicates with a tube 18b emerging on the axis of a rotary deflector 19 carrying at each end a "crown" of graphite plates 19a inclined at 45 degrees to the vertical.  The rotating axis 19b of the rotary deflector is mounted in a support 20 fixed to the interior of tube 19 and carries at its upper extremity magnetic bobs 19c which ensure that it will be set in motion in cooperation with the magnetic bobs 21a mounted on the shaft 21b of a motor 21.  The lower extremity of the rotary deflector 19 is composed of a piece of molybdenum or of tungsten 19d in the form of a pyramid whose apex is opposite the open end of the tube 9. 

              The hollow base 18 and the tube 18b can be of a borosilicate glass of low coefficient of expansion such as that sold under the trademark "Pyrex".  They may also be of quartz.  Tube 9 itself can be of "Pyrex" as above or of another glass of the quality currently used for the manufacture of electronic tubes, but its bottom 9a, which is traversed by the radiation, is advantageously made of quartz. 

              The duct 8 joins the tube 9 by way of several tubulures[sic] such as 8a and 8b directed in vertical planes towards the plates 19a at a certain angle, which is advantageously about 22 1/2 degrees.  An electromagnet 23 analogous to the electromagnet 13 of the emitter tube 1 is placed around the cathode 17.  Similarly, accelerator windings 24 are disposed around the tube 9.  This tube also carries, at positions indicated in the drawing, three elec-