. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . Fig. 26. Cooled target tube. The tube is 43 centimetres long. (Rollins A-W-L X-LIGHT ilNLET TUBEFOR COOLINGAIR OR WATER JH0LL0WJ>LAT1NUM TARGET FlG. 27. Section of cooled target tube. (Rollins.)

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