. The principles and practice of roentgenological technique . herefore, hasto be as thoroughly insulated from the patientand the ground as the tube itself. Jordan has suggested the use of an inter-rupter in conjunction with a small step-downtransformer. A rheostat in the primary circuitprovides the regulation. A motor-magneticinterrupter is used. A full Coolidge circuit is shown in diagram,Figs. 87, 89, in which the double reel goes tothe cathode end of the tube, one lead to theamperemeter the other to the secondary of thestep-down transformer. The rheostat for con-trolling the current in the
. The principles and practice of roentgenological technique . herefore, hasto be as thoroughly insulated from the patientand the ground as the tube itself. Jordan has suggested the use of an inter-rupter in conjunction with a small step-downtransformer. A rheostat in the primary circuitprovides the regulation. A motor-magneticinterrupter is used. A full Coolidge circuit is shown in diagram,Figs. 87, 89, in which the double reel goes tothe cathode end of the tube, one lead to theamperemeter the other to the secondary of thestep-down transformer. The rheostat for con-trolling the current in the filament circuit is inthe primary. A small rotary converter is usedwhere only d. c. is available. The technique forthe Coolidge tube work demands the use ofan ammeter in the filament circuit. The metershould have a 5-ampere scale, divided into l/50th ampere divisions, large enough to beeasily and accurately read. A scale readingfrom 3 to 5 is sufficient since these are thelimits for practical radiology. The metershould be located as close to the operator as. ^;l!l!llt- B A Fig. 87.—Coolidge tube circuit B is the storage bat-tery, A is the ammeter, R is the rheostat forregulation of the battery current. The doublewires go to the cathode end of the tube. Mis the milliamperemeter. possible and in such a way that it can be easilyread from the operating position. If the polarity of the machine is wrong, it
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
