398 RHODIK, OK" STORAGE BATTERIES. 



rical calculation was concerned. Early in 1895, a problem pre- 

 sented itself to my mind, viz., the variation to capacity of a 

 Laurent-Cely Stcrage Cell in function of the concentration of 

 the electrolyte used, viz: dilute sulphuric acid. I was happy 

 enough to receive some curves frora ray colleagues at St. Ouen 

 in Paris bearing upon this point; these curves are shown in 

 Fig. 2 and drawn in full: 



































1 





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 hours per Wo 

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20° 30° 



Degrees Baume. 



>rO° 



50" 



(curves a refer to 6 mm. plates and curves b to 10 mm. plates). 

 There are some objections to be made to the mode of expe- 

 riment used. Ist, The electrolyte was of a limited quantity 

 and thus subject to variations which were not noted. 2nd. The 



