ÖFVERSIGT AP K. VETENSK.-AKAD. FÖRHANDLINGAR 1 898, N:0 7. 403 



of the electrolyte to the active surface of the conductors of the 

 electrodes. It also shews that it is futile to attenipt to increase 

 the capacity of secondary batteries by unlimited increase of 

 »active material». 



I wish to mention that all the forraulae given above are 

 capable of being developed into such a form as to admit nume- 

 rical calculations after the determination of a few constants, if 

 the ordinary laws of difFüsion are applied e. g., if the current 

 to be kept up is considerable. 



By actual measurements I found that for currents exceeding 

 0.2 amperes per dm' 1 exposed grid surface in the above sense, a 

 thickness of peroxyde of lead equal to 0.1 mm. gave the maxi- 

 mum capacity, and this led me to construct the now well- 

 known R type grid, the commercial success of which has shewn 

 that a correctly constructed Plante piate as anode in connection 

 with a Faure or Laurent-Cely Kathode plate was the correct 

 Solution of the lead storage battery problem. (Engl, patent 4 

 May 1895. J. Rhodin.) 



I have published the above as an introductory chapter to 

 the collection of notes which I accumulated on this most interest- 

 ing subject, with a view to shew that problems of rather complex 

 nature in connection with electro-chemical practise can be fairly 

 easily treated if looked upon in a general manner theoretically, 

 without any attempt to specialise except by experiments, which 

 will then be easily arranged. The enormous value of the phy- 

 sical notions lately introduced into the chemical science even to 

 the practica! worker is also evident. 



Manchester,, March 1898. 



