1880.] 



The Chloride of Silver Battery. 



563 



XL " Experimental Researches on the Electric Discharge with 

 the Chloride of Silver Battery." By Warren De La Rue, 

 M.A., D.C.L., F.K.S., and Hugo W. Muller, Ph.D., F.R.S. 

 Received June 16, 1880. 



Supplement to Part III. 



The Electric Condition of the Terminals of a Vacuum-Tube after their 

 connexion with the Source of Electricity has been broken. 



The question has been mooted whether there is a polarisation of the 

 terminals of a vacuum- tube after the discharge through it has been 

 interrupted by breaking connexion between it and the source of elec- 

 tricity. This question we understand in the sense — does there exist a 

 chemical polarisation as is the case for instance with the terminals of 

 a voltameter under similar circumstances ? It is evident that if a 

 polarisation of this kind could be proved, the formula used for deter- 

 mining the tube potential (" Phil. Trans.," Part I, vol. clxxi, p. 65) 

 would no longer hold good. 



Fig. 1. 



I 



I 



The problem is by no means easy of solution, and it has engaged our 

 attention for the last five months. We believe, however, that the few 



VOL. XXX. 2 R 



