. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . eks, the exposures to be made from below through analuminum speculum, as shown in Plate X., or employing thejacketed cavity tube, Fig. 10; or a Pennington shield, ; or a modified Cossor tube, Fig. 9. The other exposureshould be made with a high-vacuum tube placed over theabdomen at a distance of eight or ten inches with the plane ofthe anti-cathode perpendicular to the axis of the superiorstrait, that the larger volume of rays may be projected down-ward through the pelvis. (See Plate XI.) 260
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . eks, the exposures to be made from below through analuminum speculum, as shown in Plate X., or employing thejacketed cavity tube, Fig. 10; or a Pennington shield, ; or a modified Cossor tube, Fig. 9. The other exposureshould be made with a high-vacuum tube placed over theabdomen at a distance of eight or ten inches with the plane ofthe anti-cathode perpendicular to the axis of the superiorstrait, that the larger volume of rays may be projected down-ward through the pelvis. (See Plate XI.) 260 STATIC ELECTRICITY. The method of screening during this procedure is simpleand effective. Place the large screen of rubber composition(Fig. i), or a tin one, having a hole about five inches indiameter in the center, in a position that will permit the rays topass as suggested. It will be generally unnecessary to em-ploy any other screen in these cases if the one employed iseighteen by twenty-four inches in dimension, as the positionof the anti-cathode will direct the rays from the upper por-. Fig. II.—The Pennington Shield. tion of the abdomen, and the thighs will not be near enoughto be unfavorably affected. When raying at the perineum the same rubber shield may beemployed, securing it to the thighs by the cords attached, andfitting within the opening small shields sufficient to cover theparts not necessary to expose, as shown in Plate X. If the jacketed tube, Fig. 10, is employed the inner tubewithin the water bath should be covered except for one inch or
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