Vol. X , No. 6.] Measurements with Quadrant Electrometers. 233 



[N.S.] 



DIAGRAM JL 



Vol ts I m i n 



Leak of Quadrant sand Condenser 



OOIO 



008 



0006 



O004 



002 



O 



40 



80 



120 



160 



Hours after closing case 



After this alteration, calcium chloride was again introduced 

 into the case, which was then closed. It will be seen from Dia- 

 gram I, which shows the quadrant leaks under various condi- 

 tions, that calcium chloride is unsuitable. Though the leak 

 immediately after the case was closed fell to near the standard 

 value of 001 volt per minute, it rapidly increased to double this 

 value aftftr lfi hours, after which it remained more or less 

 steady. 



„ 16 hours, after 



On the ebonite of the condenser the improvement 



The results 



lasted rather longer, as is shown in Diagram II. 



ease 



ized in Table III : 



