296 



Mr. J. Daniel on the Polarization upon a 



Table IV. 



Showing the minimum current at which the gases developed 

 visibly upon a gold-leaf partition in various electrolytes. 

 The electrodes were platinum. The values given are usually 

 the mean of several determinations. 



Electrolyte. 



Sp. gr. 



Current. 



Current- 

 density. 



CuS0 4 



17 p. c. 

 9p.c. 

 5 p. c. 

 1-10 



Saturated. 



1*10 



105 

 1-10 



1-135 



1-06 



1-09 



Saturated. 



017 

 0-40 

 The feeblest 

 0018 

 0-19 

 015 

 032 

 0-30 

 013 

 0-18 

 0-31 

 0-17 

 065 

 2-80 

 300 

 M0 

 0-70 

 075 

 075 



o-io 



0'23 Ag 2 2 formed on anode, 

 current. Less than "001. 

 001 Pb0 2 on anode. 

 011 



0-08 Mn0 2 on anode. 

 0-18 

 017 

 007 



o-io 



0-18 

 010 

 037 

 1-60 

 1-75 

 0-63 

 040 

 043 

 043 



AffNO, 



CdL 



Lead acetate ... 

 ZnS0 4 



MnS0 4 



FeS0 4 



SnS0 4 



NiS0 4 



Sul. Am. & Fe 

 Sul. Am. & Ni 

 HgSO, 



Am. nitrate ... 



>5 >> ••• 



Am. acetate ... 



Na acetate 

 Na benzoate ... 



A 96 per cent, solution of acetic acid was found to have too 

 high a resistance to give a sensible current with 50 volts 

 E.M.F. Benzoic acid dissolved in the same was also an 

 insulator. 



Table V. 



The Critical Current in 30 per cent. H 2 S0 4 for Aluminium- 

 leaf, Platinum-leaf, and Grold-leaf : — 



Partition. 



Critical current. 



Current-density. 



Al 



8-0 

 100 

 10-0 



4-57 

 5-71 

 5-7 L 



Pt 



Au 









