198 Dr. B. Hodgson on Heating Effects at 



§ 4. Diseussio?i o/fig. 3 Curves. 



These curves can be analysed into five distinct parts as 

 shown in the diagram below. 



The energy given up to the anode is constant for pressures 

 above 2 mm. as shown in part 1 of fig. 4. At 2 mm. the 

 energy begins to increase and reaches a maximum at a 



pressure of 15 mm. for all curves. 



Fig. 4. 



The potential gradient 



~PR E Si=UH E — » 



in the tube has also risen. In both parts 1 and 2 of fig. 4 

 the factor determining the energy appears to be the mean 

 gradient in the tube, for in part 1 both gradient and energy 

 are constant and a fixed ratio appears to hold between 

 gradient and energy for points on parts 1 and 2. This is 

 shown in Table VI. from results collected from Tables I. 

 and II. 



Table VI. 



i. 



pr. 



Energy, i 



Gradient. 



Gradient/Energy. 



-002 



(3-8 

 |l-5 



75 

 138 



195 

 285 



2-6 I 

 2-1 ) 



| -003 



J3-8 

 1 1-5 



99 

 194 



145 



290 



%}' 



•004 



T3-8 

 1 1-5 



124 

 258 



132 

 280 



&} 



•005 



;' 3-8 

 1 1-5 



146 

 312 



120 



280 



0-82 \ 



o-9o ; 



•006 



T3-8 

 ll-o 



197 

 362 



120 

 282 



061 "1 



078 j 



•007 



j'3-8 

 1 1-5 



222 



402 



140 

 270 



063] 

 0-67/ 



