. Radiography and radio-therapeutics . ioned above. This is very efiicacious, but necessary only whenvery lengthy runs are being undertaken. AIR-COOLED TUBES 61 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.). An auxiliary bulb (having a diameter of about6^ inches) is connected to the tube, thus forming a reserve construction results in the tube possessing all the advantagesinseparable from one having a Jarge cubic capacity ; while the fact ofthe anti-cathode being onl
. Radiography and radio-therapeutics . ioned above. This is very efiicacious, but necessary only whenvery lengthy runs are being undertaken. AIR-COOLED TUBES 61 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.). An auxiliary bulb (having a diameter of about6^ inches) is connected to the tube, thus forming a reserve construction results in the tube possessing all the advantagesinseparable from one having a Jarge cubic capacity ; while the fact ofthe anti-cathode being only 2| inches from the wall of the tube enablesthe original Sabouraud distance to be adopted. Air-cooled Tube.—This is a specially constructed tube, an airpump being employed to supply a forced draught which is sent into thecathode and anti-cathode of the tube. By means of the small electricmotor operating the force-pump, air at the temperature of the room is usedat considerable pressure. The special modifications of the tube required. Fig. 44.—Macalaster Wiggin water-cooled tungsten tube. (Newtou aud Wriglit.) are as follows : In place of the ordinary cathode there is employed a verymassive 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 annature,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,currents of at least 5 to 7 milhamperes may be passed continuously withoutany ill effects. There has been introduced a further elaboration of this type of tube, a tube working as described above but fitted m addition with an atomiserconnected to a vessel containing water. Instead, therefore, of ai
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