. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . , issought, a low tube should be selected, preferably one of notmore than one-inch spark resistance, and the tube energizedto the maximum capacity of the apparatus employed, makinguse in such cases, with the static machine, of a series spark-gap interrupter. IV. The adjustment of the tube requires technical consid-eration if the best results are to be obtained. Distortion too often arises from failure to recognize the con-ditions of the radiation of the X-ray. The employment of 192 STATIC ELECTRICI
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . , issought, a low tube should be selected, preferably one of notmore than one-inch spark resistance, and the tube energizedto the maximum capacity of the apparatus employed, makinguse in such cases, with the static machine, of a series spark-gap interrupter. IV. The adjustment of the tube requires technical consid-eration if the best results are to be obtained. Distortion too often arises from failure to recognize the con-ditions of the radiation of the X-ray. The employment of 192 STATIC ELECTRICITY, the sensitized plate in connection with the process of skiag-raphy possibly leads to a confused idea, from its association withphotography. It must be borne in mind that the image uponthe sensitized plate is as if the shadow of an object in the sun-light had made a fixed impression upon a plane surface, notthrough a focusing lens, with which the image is always re-versed. In the latter case the print from the negative producesa second impression upon the sensitized paper with the objects. Fig. 18.—Showing Radio-active Field and Occasion for Distortion. in their normal relation. The reverse is true of the skiagraph:the shadow casts an image upon the sensitized plate of theparts in their normal relation, and the print made upon thesensitized paper reverses the relation of the object, the righthand or right side of the body always appearing as the leftupon the printed skiagraph. The sun casts a shadow obliquely or directly upon a back-ground, according as it is placed, relatively before the back-ground. It is the same with the skiagraph: the anti-cathode—the luminous body from which the rays are projected—castsa shadow upon the sensitized plate directly opposite or ob-liquely, according to their relative positions. The rays pro-jected upon a plane surface will in all cases produce a relativedegree of distortion, from the fact that the outer rays, making METHOD OF MAKING
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