. Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy . sion is deep-seated, as in cases of carcinoma of the uterus,stomach, or abdomen, a medium tube should be used. The connec-tion of the Crookes tube with the oscilloscope is explained at Fig. 215. Peotection or Healthy Parts. Prior to the application of the rays (as in cases of superficialulcers, epithelioma, etc.) the surrounding normal tissue should be pro-tected against the influence of the rays. This may be accomplished byshielding the surrounding integument by leaden sheets, iz of an inch(1 mm.) in thicknes
. Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy . sion is deep-seated, as in cases of carcinoma of the uterus,stomach, or abdomen, a medium tube should be used. The connec-tion of the Crookes tube with the oscilloscope is explained at Fig. 215. Peotection or Healthy Parts. Prior to the application of the rays (as in cases of superficialulcers, epithelioma, etc.) the surrounding normal tissue should be pro-tected against the influence of the rays. This may be accomplished byshielding the surrounding integument by leaden sheets, iz of an inch(1 mm.) in thickness, covered with adhesive plaster, and grounded, inwhich an aperture has been cut, to permit the passage of the aperture should be of the same size as the superficial lesion. This tech:n^ic of rontgen eay theeapy. 423 precaution, liowever, does not apply to lesions that are deep-seated, therisk of setting up an integumentary inflammation weighing but little incomparison with the gravity of the condition. An ingenious device is the protective tube shield, which conforms to. Fig. 215.—Connection of the Tube and Villaed Valve with the Oscilloscope.—Piffard, ofNew York, uses the oscilloscope as an index of the inverse current. When the inverse current is exces-sive, a violet glow ^vill appear on both terminals of the oscilloscope ; if the current is unidirectional theglow will be manifest only on one terminal of the oscilloscope. The oscilloscope is in reality a Geisslerbulb. the size and shape of the Crookes tube, and is provided with differentsized cylinders, or localizers, allowing either a large or small surface to beacted upon by the rays. 424 ELECTEO-THEEAPEUTICS. Position. The position of the tube is of little importance, except that theanodal field must face the lesion. The satisfactory application of the raysto such conditions as carcinoma of the cervix uteri, diseases of the oralcavity, the larynx, stomach, and rectum is a matter of much difficulty. Ifthe tub
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