. Radiography and radio-therapeutics . ;. .il I.—X-ray couch to illustnite iiictlioJ ot compre.s.siou The next important point in the taking of good radiographs lies in the 24 370 KADIOGKAPHY management of the X-ray tube. Here, again, a great deal depends uponthe operator and his knowledge of the apparatus at his command. Goodpictures can be obtained with almost any ordinary apparatus. It is notnecessary to have elaborate installations in order to get good results. Manyof our radiographs have been obtained by the use of a 10-inch coil, a mercuryinterrupter, and an ordinary X-ray tube. The expo
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. Radiography and radio-therapeutics . ;. .il I.—X-ray couch to illustnite iiictlioJ ot compre.s.siou The next important point in the taking of good radiographs lies in the 24 370 KADIOGKAPHY management of the X-ray tube. Here, again, a great deal depends uponthe operator and his knowledge of the apparatus at his command. Goodpictures can be obtained with almost any ordinary apparatus. It is notnecessary to have elaborate installations in order to get good results. Manyof our radiographs have been obtained by the use of a 10-inch coil, a mercuryinterrupter, and an ordinary X-ray tube. The exposure necessary mayvary from an instantaneous flash to five minutes. With a 12-inch coil, amoto-magnetic interrupter, and a heavy anode Miiller tube it is possible toget all the necessary detail with an exposure of about ten seconds or less. The controlling factors are : (1) the amount of current passing throughthe X-ray tube, (2) the distance of the tube from the plate, and (3) the bodyweight of the patient. The latter factor is imp