. A text-book of radiology . the tubeor of introducing a corresponding portion from outside. It would serve no useful purpose to describe all themethods that have been tried—even did space permit—so only those will be referred to which seem to be thebest. All tubes, with or without any special device for regu-lation, may often be put right by heating with a spiritlamp or bunsen flame. This acts by releasing a number•of the occluded electrons, but it should be done with care 42 TEXT-BOOK OF RADIOLOGY. and the flame must be kept constantly moving. The wallsof the tube are thin and may be easily
. A text-book of radiology . the tubeor of introducing a corresponding portion from outside. It would serve no useful purpose to describe all themethods that have been tried—even did space permit—so only those will be referred to which seem to be thebest. All tubes, with or without any special device for regu-lation, may often be put right by heating with a spiritlamp or bunsen flame. This acts by releasing a number•of the occluded electrons, but it should be done with care 42 TEXT-BOOK OF RADIOLOGY. and the flame must be kept constantly moving. The wallsof the tube are thin and may be easily melted by atmospheric pressure. Prolonged baking inan oven is also a very useful method, and seems to pro-duce a much more lasting effect than the heating by flame for a short period. Another method that answers excellently at times is toconnect the tubes to a very much more powerful coil andwork it vigorously, even to the extent of making the anti-cathode red hot. It is, however, not always
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