Vol. VI, No. 2.] The Electro-chemical Equivalent of Nickel. 53 



[N.S.] 



Table V. 



Effect of covering the Cathode in Filter Paper. 



Second. 



Ampere. 



840" 



•9014 



840" 



•9014 



840" 



•8874 



840" 



11 924 



840" 



1-0840 



Ca. gain. 



An. loss 



E.C."E. (Ca.). 





2241 

 2225 

 2139 

 2901 

 2686 



•0153 



0187 

 0169 

 0201 

 0201 



0002959 

 0002939 

 0002869 

 0002896 

 0002950 



E.C.E. (an.) 



•00002023 

 00002468 



00002267 

 00002006 

 00002004 



Mean e.c.e. = 0002913. 



Mean probable error of the result = '000001. 



Probable error of one observation = -000003. 



The values of the e.c.e. obtained in this series are fairly 

 consistent. In experiments 3 and 4 the deposits were found 

 to be dark and loose at those places where the filter paper 

 pressed against the cathode surface. The values of the e.c.e. 

 were therefore comparatively low. 



In the next set of experiments, a bag of filter paper was 

 prepared with a stiff collar to prevent its collapse under liquid 

 pressure. There was sufficient space inside the enclosure to 

 keep the cathode hanging quite freely. Decidedly better- 

 results were obtained as will be seen from Table VI. 



Table VI. 



Effect of circulating the replenishing mixture of 



and Carbonate round the filter bag with th 



MCE 



(Ca). 



000287- 



0002977 



0002978 



0002993 



0002989 



0003023 



000303 



0002924 



0002983 

 •0003053 



Mean 



0002983 



(An.). 



< haracter ot 

 deposit. 



- 



0000216 

 •0000200 



•000017* 



0000168 



0000349 



-0000204 

 0000325 



0000807 



000036 



Loose and dark 

 White and firm 

 do. 





do. 

 do. 



do. 

 do. 



do. 



fit 



do. 

 do 



Loose and dark. 

 White and firm 



do do. 



XTXvCVll xy»v*v* ___ — 



Probable error of the result 



000001. 



