. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . ofswitches, and these switches are so placed that the physician can reachthem while continuing his examination, and throw in more or less ofthe condenser, as the needs of the moment may require. In order to adapt to medical practice the above-mentioned apparatus, 1 A description of this apparatus may be found in the following journals: Science, Febru-ary 26 and March 26, 1897; Nature, March 18, 1897; Electrical Engineer, March 24, 1897. X-RAY EQUI
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . ofswitches, and these switches are so placed that the physician can reachthem while continuing his examination, and throw in more or less ofthe condenser, as the needs of the moment may require. In order to adapt to medical practice the above-mentioned apparatus, 1 A description of this apparatus may be found in the following journals: Science, Febru-ary 26 and March 26, 1897; Nature, March 18, 1897; Electrical Engineer, March 24, 1897. X-RAY EQUIPMENT 27 Messrs. Norton and Lawrence, at my suggestion, subdivided the con-denser, made the speed of the interrupter variable, and put in anadjustable spark-gap (see page 16). Without these adjustments theapparatus would not be suitable for examinations of the chest. I alsofound it desirable to use a slate wheel, and to employ Van Depoelesprinciple of carbon brushes instead of metallic contacts on the inter-rupter, and experiment showed me that two or more brushes were betterthan a single one. I have run this commutator on a 220-volt circuit. Fig. 19. Cut of portable apparatus for u-sc on iio-volt circuit. The smaller box contains the coil;the larger, the interrupted electrolytic interrupter, two vacuum tubes, and the tube-holder. Thetube-holder is shown fastened to the smaller box. continuously for four hours ; at least half of this time with a flow of2^ to 3 amperes. The tube used was a self-regulating one devised byDr. Rollins, and it gave a steady light during the whole of this time. Portable Apparatus. — This whole apparatus (Fig. 19) weighs 40pounds and can be easily carried by a man, one box in each hand. Inplaces where no iio-volt circuit is available, I have used an electric cabor carriage by running insulated wires from the storage battery in thecab to the patients room, and connecting them with an X-ray apparatus. 28 THE ROENTGEN RAYS IN MEDICINE AND SURGERY B. Hig
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