Haokett and Feei,y — The Polarisation of a Leclauche Cell. 283 



selecting a suitable value. As time goes on, the slow process of recovery 

 becomes more important than the final stages of the first process, and the 

 curve of recovery will gradually rise above V, to the final steady value. 



Summary of Observations on Lcclanchd Cell. 



The analysis just described has been applied to some 30 sets of obser- 

 vations on Leclanche" cells over a range of values for the polarising currents. 

 In all cases, in order to fix the conditions of the experiment, the current 

 through the cell was maintained constant until the conditions of the cell had 



4 5 



Time (minutes). 



Fig. 2. 



become nearly steady. Fig. 1 shows that this stage is reached in about 

 10 minutes. The voltage of the cell during its recovery was observed with a 

 Weston voltmeter. Its rise, however, is subject to some obvious criticisms. 

 This instrument, though convenient, is not sufficiently accurate when the 

 changes in voltage are very rapid or when they are small. In addition the 



