ÖFVERSIGT AP K. VETENSK.-AKAD. FÖRHANDLINGAR 1898, N:0 7. 401 



means of a frame-work of metallic lead or lead alloy. These 

 peroxyde slabs are poroas and contain in the pores electrolyte 

 of the same density as the density of that which fills the space 

 between the plates when the cell is fully charged, and has been 

 at rest for some time. As soon as the tcurrent Output begins 

 the electrolytic action will cause an alteration of the ion con- 

 centration of the electrolyte in the pores of the peroxyde, and at 

 the saine time a difFusion of ions from the outside will take 

 place. If we then contemplate the possible interaction between 

 the electrolytic dilution and the simultaneous concentration by 

 difFusion, we shall be able to introduce a time element, which 

 for a cell with the electrolyte at rest will determine the time 

 limit called capacity. 



If Fig. 4 represents schematically the ele- 

 ments of a storage battery and we consider 

 the layers a, b and c, of electrolyte, peroxyde 

 of lead and lead in contact with P6(A,, we can 

 make the following deductions. For the time 

 t the current I would rob the layer between b 

 and c of ions to the extent of Izl t hence, if 

 the original number of active ions at this sur- 

 face was d, the resulting number after the 

 time t would equal: — 



cl — U t .. (2) 



There would then be a difference of concentration between this 

 surface and the neighbouring one equal to 



d~(d — lJ t ) = U ( (3) 



Hence there would be a difFusion of ions to this surface equal 

 to a function of (3) 



(pUt (4) 



It is then easy to see that the final concentration of ions at 

 this »active» surface would be after the time t: 



x = d + cpL/t — U t (5; 



