. Archives of physical medicine and rehabilitation . on 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-cjuent 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,su
. Archives of physical medicine and rehabilitation . on 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-cjuent 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 lo 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 at the moment to determine how. fg^^.. 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 ol 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 thera
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