. Radiography, X-ray therapeutics and radium therapy . ording to the position of theX-ray tube, so as to permit of the aperture being always uppermost. If desired, the water can be circulated through the tube by means of the 3 34 RADIOGRAPHY syphon mentioned above. This is very efficacious, but necessary only whenvery lengthy runs are being undertaken. There is another type of tube made by several makers which is veryefficient and convenient for treatment. This tube has a diameter of about5 inches (125 mm.). As will be seen from Fig. 215, p. 295, an auxiliary bulb(having a diameter of about Qh
. Radiography, X-ray therapeutics and radium therapy . ording to the position of theX-ray tube, so as to permit of the aperture being always uppermost. If desired, the water can be circulated through the tube by means of the 3 34 RADIOGRAPHY syphon mentioned above. This is very efficacious, but necessary only whenvery lengthy runs are being undertaken. There is another type of tube made by several makers which is veryefficient and convenient for treatment. This tube has a diameter of about5 inches (125 mm.). As will be seen from Fig. 215, p. 295, an auxiliary bulb(having a diameter of about Qh inches) is connected to the tube, thusforming a reserve air-chamber. This construction results in the tubepossessing all the advantages inseparable from one having a large cubiccapacity ; while the fact of the anti-cathode being only 2| inches fromthe wall of the tube enables the original Sabouraud distance to be adopted. Air-cooled Tube.—The tube employed is specially constructed,an air pump being employed to supply a forced draught which is sent. Fig. 30.—Dessneur tube with atomiser for cooling the anti-cathode. (Siemens.)This tube is .specially exhausted for deep therapeutic work. into the cathode and anti-cathode of the tube. By means of the smallelectric motor operating the force-pump, air at the temperature of the roomis used at considerable pressure. The special modifications of the tuberequired are as follows : In place of the ordinary cathode there is employeda very massive hollow armature, with the same diameter as the anti-cathode ;into both cathode and anti-cathode are fitted inlet tubes, which bring thecold air into direct contact with the whole inner surface of the armature,and the heated air is expelled through a number of peripheral connection between the X-ray tube and the air pump is made by meansof strong india-rubber tubes. The cathode is cooled as efficiently as theanti-cathode, this being a very important point. In a tube of this type,cu
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