. Radiography, X-ray therapeutics and radium therapy . advocates. The earlier therapeutic tubeswere of small diameter, and were exhausted to work with a small amount of current in the secondary,the resistance of the tube beingkept low in order to ensure alarge percentage of soft raysdischarging from the tube. Thebulb of the tube was made verythin with the intention ofallowing as many of the softrays to pass as possible. Specialglass windows were introducedopposite the anti-cathode toallow still further the softestrays to pass. A gradual tendency hasasserted itself of late to use thelarger tube
. Radiography, X-ray therapeutics and radium therapy . advocates. The earlier therapeutic tubeswere of small diameter, and were exhausted to work with a small amount of current in the secondary,the resistance of the tube beingkept low in order to ensure alarge percentage of soft raysdischarging from the tube. Thebulb of the tube was made verythin with the intention ofallowing as many of the softrays to pass as possible. Specialglass windows were introducedopposite the anti-cathode toallow still further the softestrays to pass. A gradual tendency hasasserted itself of late to use thelarger tubes, and a harderquality of ray has taken theplace of the very soft one. Thelatter was found to produce aconsiderable degree of reactionand even dermatitis without inany way increasing the thera-peutic action on the deepertissues. Even in the treatmentof ringworm it has been foundthat satisfactory results areobtained when a hard tube isused, and the reaction obtainedis much less thanthat from a softtube. And inthis disease theuse of \ of alu-. Pii 213.—Diagram to illustrate a method of circulating water to the anti- UimiUm givescathode of a tube. (Schall.)The tube is shown unprotected. This would not occur in actual practice. quite good re- sults, with hardly any reaction, and only slight delay in the epilation. So that even forthe most superficial conditions we may have to treat, a hard ray canbe employed and a filter used. The Coolidge tube promises to beof great value in therapeutics. With its ready adjustment of quality THERAPEUTIC TUBES 295 of ray emitted from the tube it should be possible to select the properdegree of hardness at will, and arrange the tube to produce it for
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