Recovery of Residual Charge in Electric Condensers. 585 



the shutter is closed and therefore no current passing across 

 the air-gap. 



If, then, we plot the values of (L t — OS) against time, we 

 obtain the rate at which the Residual Charge came out of the 

 condenser under a constant difference of potential. 



In all the experiments, however, surface-leakage was 

 present. Its value in terms of the uranium-fluoride leak 

 was always found after the main experiment was finished. 

 Owing to this surface-leakage a certain quantity (which 

 admits of easy calculation) must be added to the value 

 of (L f — OS) in order to give the rate of appearance of 

 Residual Charge. 



This has been done, and the corrected values of (L^ — OS) 

 which represent current have been plotted against time in 

 figs. 6, 7, 8, where ordinates represent current and abscissae 

 time. The data corresponding to these figures will be found 

 in Tables IV., V., and VI. 



Table IV. 

 J Partition exposed. 



Time. 

 1 uuit = 7'5 seconds. 



Current (in 



arbitrary nnits). 



Observed. 



Calculated 

 from equation 







679 



529 



4-19 



3-47 



3-09 



2-79 



2-47 



2-09 



1-84 



1-61 



1-49 



1-29 



1-09 



•89 



•79 



■65 



•49 



6-79 



5-35 



4-36 



364 



310 



266 



2-31 



2-05 



T78 



1-57 



1-40 



1-23 



1-10 



•97 



•81 



•77 



•68 



1 



9 



3 



4 



5 



6 





8 



9 



10 



11 



12 



13 .... 



14 



15 



16 





Talues of constants in the above equation: — 



fl=l-01, &=4*44, d= 34-63. 



