THE WORLD'S ADVANCE 



205 



close scrutiny of his hands disclosed not 

 the slightest symptoms of the familiar 

 dermatitis, and, as the inventor remarks, 

 'The proof of the pudding is in the eat- 

 ing." 



Some small experience in connection 

 with the use of tubes on very high volt- 

 ages prompted the visitor to inquire 

 whether or not the inventor had exper- 

 ienced any difficulty with punctures 

 when operating the tube at great poten- 

 tials. To this Mr. Stanley replied that 

 in this very direction was to be found 

 his chief obstacle. In the early days of 

 his experiments, he stated that he had 

 punctured one tube after another and it 

 was not until within the last few years 



In the Oval: Stanley Operating 

 the Switchboard of His Appa- 

 ratus. At the Right: Drawing 

 a Spark from One of the High 

 Potential Terminals of the 

 Transformer. 



that he had succeeded in get- 

 ting a tube to stand up under 

 the terrific strain. The in- 

 ventor stated further that he 

 had ordered a special tube 

 twelve inches in diameter and 

 felt that when it arrived he 

 would have the missing link, 

 so to speak. 



The demonstration of the apparatus 

 served very largely to dispel the inevit- 

 able doubt that had formed itself in the 

 visitor's mind. The apparatus beyond 

 any question exhibits a remarkable pene- 

 tration. Fluoroscopic examinations can 

 be made at a distance of thirty feet from 

 the tube, and when the apparatus was 

 placed at a distance of six or seven feet 

 from a heavy oak door, the rays readily 

 penetrated in order that the bones of the 

 hand might be examined on the far side 

 of the door. While this penetration is, 

 in itself, not remarkable, when one stops 

 to consider that the ray of this power 

 is apparently harmless, the wonder of 

 the feat can be more appreciated. 



The most obvious advantage in 

 the ability to use the tube at some 

 distance from the subject is found 

 in the wonderfully sharp and clear 

 radiographs or X-ray pictures 

 that may be taken in this manner. 

 By increasing the distance be- 



