. Radiography and radio-therapeutics . atter of considerable importance. In this connection the further advantage may be pointed out that theequipment can be connected directly to 400-volt power circuits ; this voltageis now frequently adopted, but is unsuitable for induction coils, and a reduc-tion in the voltage, which is in most cases not feasible, would be necessaryfor satisfactory operation. Using the apparatus as a rectifier the continuous current is convertedinto alternating current by means of a rotating converter, the alternatingcurrent being fed to a high-voltage transformer. A descr
. Radiography and radio-therapeutics . atter of considerable importance. In this connection the further advantage may be pointed out that theequipment can be connected directly to 400-volt power circuits ; this voltageis now frequently adopted, but is unsuitable for induction coils, and a reduc-tion in the voltage, which is in most cases not feasible, would be necessaryfor satisfactory operation. Using the apparatus as a rectifier the continuous current is convertedinto alternating current by means of a rotating converter, the alternatingcurrent being fed to a high-voltage transformer. A description of the single-impulse system is as follows: 52 RADIOGRAPHY The alternating current from the transformer is led through the rectifierdriven by the rotary converter, the high-tension alternating current beingthus converted into high-tension continuous current. This high-voltagecontmuous current is measured by a milhamperemeter and then led throughthe X-ray tube. The current in the tube is adjusted by resistances which are so pro-. FlG. aa.—, iHitlit (Siciiifii-,}, shuwiiig switrli [-Zj. ami ^\vltl■ll-tul>le \vitli time \v].\\ ( 1),for using outfit as a rotating high-tension rectifier. Cabinet (3) contains single-impulsetransformer and rectifier, connected to an X-ray tube (1). portioned that the current may be adjusted from I milliampere to about80 milliamperes. When the apparatus is used for the taking of single-impulse radiogra])hsthe rotary rectifier is no longer used, hut only the high-voltage transformerbuilt into the apparatus. For single-impulse operation the transformer isno longer excited by the alternating current from the converter, but
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