. The American journal of roentgenology, radium therapy and nuclear medicine . ed thatthere is a break in the filament current curvefor each cycle of current through the tube. This shows that the vibrating armaturevibrates in synchronism with the alternatingcurrent supplying the tube. This is the armature did not vibrate in synchro-nism, the filament current would not be ad-justed to the correct value on some of thecycles, which would cause a variation in themilliamperage through the tube. That the stabilizer does produce an evenflow of high tension current through thetube is show
. The American journal of roentgenology, radium therapy and nuclear medicine . ed thatthere is a break in the filament current curvefor each cycle of current through the tube. This shows that the vibrating armaturevibrates in synchronism with the alternatingcurrent supplying the tube. This is the armature did not vibrate in synchro-nism, the filament current would not be ad-justed to the correct value on some of thecycles, which would cause a variation in themilliamperage through the tube. That the stabilizer does produce an evenflow of high tension current through thetube is shown by evenness of the peaks of thewaves in the upper curve, which is the curveof the high tension current. There are many applications which can bemade of the new device. It will make it easy to combine fluoro-scopy with radiography, as, by means of thestabilizer and a suitable switch, the changecan instantly and surely be made, even inthe dark, from a fluoroscopic to a radio-graphic load. It will eliminate one of the complicationsin the manipulation of a stereo-fluoroscope,. Fig. 4. 6o^ A Suggestion for Improving the Visibility of the Apical Field as, by its use, the two tubes can be made tomaintain constantly and automatically thesame millamperage. It will increase the allowable radiographicload on a given size of focal spot. For itwdll make it unnecessary to test a tube andwill in this way make it possible to start theactual exposure with a cooler target. It will,furthermore, render it unnecessary to allowa large factor of safety to guard against in-accurate adjustment of filament temperatureand against inaccurate measurement of mil-liampereage. It will be of great value in the administra- tion of accurate dosage in therapy, especi-ally where a technique is employed which in-volves a long time of treatment. It should reduce puncturing troubles withboth tubes and high tension generators, byreducing the surges attendant upon suddenchanges in milliamperage. It will be very helpf
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