. The principles and practice of roentgenological technique . eoscopic examinationthere is necessary 1. The maintenance of the undisturbed re-lationship between the immobilized part andthe fluoroscopic screen. 2. The radiations from two focal points cm. from each other. 3. The proper viewing of the image. To make this examination radiographicallyis simple, as will be shown later on; but fluoro-scopically it is more difficult. A tube with two targets or two separatetubes are so arranged that their focal pointsare cm. apart. These are so connectedto the energizing apparatus that the x-
. The principles and practice of roentgenological technique . eoscopic examinationthere is necessary 1. The maintenance of the undisturbed re-lationship between the immobilized part andthe fluoroscopic screen. 2. The radiations from two focal points cm. from each other. 3. The proper viewing of the image. To make this examination radiographicallyis simple, as will be shown later on; but fluoro-scopically it is more difficult. A tube with two targets or two separatetubes are so arranged that their focal pointsare cm. apart. These are so connectedto the energizing apparatus that the x-raysare given off alternately from each tar-get, the image thus falling on the fluor-escent screen is for an instant from one direc-tion and the next instant from the other. Theobserver, as in ordinary fluoroscopv, viewsthe screen in a darkened room, but there isplaced before the eye a rotating shutter. Thisrotating shutter is propelled by a small motor,which revolves synchronously with the com-mutating device of the interrupterless trans-former. Fig.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
