. Journal of radiology . nstruction isthat it is much more simple and inex-pensive to rectify the primary current. at 220 volts for example, than to de-liver that voltage to the transformer,step it up to 220,000 volts, and rectifythe latter high potential with its conse-quent load on the transformer. Thereis this to be said of this method: Itpractically eliminates corona and staticaccumulation in the field of inductedenergy, delivers a uni-directional cur-rent to the transformer, and permitsmuch simpler and less costly construc-tion. So far as is perceived at the moment,such a plan of construc
. Journal of radiology . nstruction isthat it is much more simple and inex-pensive to rectify the primary current. at 220 volts for example, than to de-liver that voltage to the transformer,step it up to 220,000 volts, and rectifythe latter high potential with its conse-quent load on the transformer. Thereis this to be said of this method: Itpractically eliminates corona and staticaccumulation in the field of inductedenergy, delivers a uni-directional cur-rent to the transformer, and permitsmuch simpler and less costly construc-tion. So far as is perceived at the moment,such a plan of construction ought notonly to be feasible and practicable inradiography and fluoroscopy, but alsoadvantageous. There are a number ofconditions known to every experiencedradiologist which might conceivably beeliminated in this kind of work by hav-ing the rectification occur on the pri-mary instead of the secondary side. In the case of therapeutics, however,there is not sufficient information athand at the moment to determine how,. under this method of construction, itis possible to control the character ofthe wave actually delivered to the to the question of lead and lagincident to the magnetizing and de-magnetizing processes of the trans-former, some serious questions are sug-gested, because it is vitally imperativein therapy work to definitely determineand control the character of the wavedelivered into the tube in order thatx-rays of the desired character andlength may be produced. Workers with this kind of apparatuswill undoubtedly be interested in know-ing exactly what effect the High Ten-sion Company produces by its peculiarmethod of construction on the charac-teristics of the wave on the secondaryside delivered into the tube, throughthe introduction of a rotary wave se-lector into the primary circuit. As theywill also be interested in knowing thedetails of construction by which an ab-solute control of wave characteristics,so essential to therapy work, is estab-lished. Wi
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