﻿276 



Mr. S. Skinner on the Clark Cell 





E-e 



E-c 



E-e 



E-e 





for 0014 



for -0028 



for -007 



for -01 





ampere. 



ampere. 



ampere. 



ampere. 



L 



4 

 4 



185 



8 

 10 

 365 



21 

 26 



29 



L 



L 



N 



B 



4 



7 



17 





It will be observed that for a given cell the electromotive 

 force of polarization is directly proportional to the current- 

 density. 



§ 7. Effect with Time, the Current being maintained. 

 The experiments to be described in this section show how 

 the potential-difference varies when the cell is allowed to 

 produce a current for some time. For these experiments the 

 standard of reference was a set of Helmholtz cells described 

 in the paper quoted above, p. 618 ; they were immersed in a 

 tank of paraffin oil. On January 17th they were submitted 

 to a very rigorous test for constancy, extending over four 

 hours, a Clark cell being the standard. It is not necessary 

 to say anything further about them. 



Fig. 1. 



I Clark L 



The arrangement used in the experiments is illustrated in the 

 accompanying diagram (fig. 1), which clearly explains itself. 



