. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . consist of a wooden frame having a glass front, and pro-vided with a movable back and a spring for holding it in posi-tion. (See Fig. 21.) The skiagraphic plate is placed with the film outward andthe printing paper is placed over it in the back and then tightlyclosed to hold the paper in apposition during the printing 202 STATIC ELECTRICITY. process. The exposure is then made either in direct sunlight,subdued light, or the light of an electric lamp, according tothe character and sensitivene
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . consist of a wooden frame having a glass front, and pro-vided with a movable back and a spring for holding it in posi-tion. (See Fig. 21.) The skiagraphic plate is placed with the film outward andthe printing paper is placed over it in the back and then tightlyclosed to hold the paper in apposition during the printing 202 STATIC ELECTRICITY. process. The exposure is then made either in direct sunlight,subdued light, or the light of an electric lamp, according tothe character and sensitiveness of the paper employed. Developing.—After the exposure has been made, somepaper, as bromide, requires developing. Place it in a develop-ing solution and develop the same as the sensitized plate. Fixing will also be necessary and various formulas will beemployed according to the requirements of each special paper,directions for which will be furnished by the experience will be required in order to carry out thisprocess in the most rapid and successful manner, but by fol-. Fig. 21.—Printing Frame. lowing the directions furnished with the particular paper whichis adapted ior use, it will not generally be difficult. It is best always to employ the same plates, papers, and de-velopers with which the operator will soon become familiar. Stereoscopic radiography constitutes a method for show-ing a superposition of images from two skiagraphs of variousplanes and the distances which separate them. It is accom-plished by taking two skiagraphs at different angles of ex-posure, substantially as follows: The object is placed in posi-tion upon the table before making the first skiagraph. Atube-holder, provided with a means for marking by a gauge theexact relative position of the tube to the object, is placed inposition. The exact center of the object is discovered bymeasurement and the employment of a plumb line. The tubeis so placed that the center of the anti-cathode
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Keywords: ., bookcentury1900, bookdecade1900, bookid390020674760, bookyear1904
