666 



Dr. S. R. Milner on the 



Time from start 



Current 



V+OEab 



V. 



V. 



Diff. 



(mins.). 



(amp.). 



(obs.). 



(obs.). 



(calc). 



11 



4-85x10-6 



0274 



•0204 



•0202 



+ •0002 



20 



445 



•0297 



0233 



•0225 



+ ' 8 



40 



400 



•0310 



•0252 



0252 







69 



3-57 



•0328 



•0276 



0273 



4- 3 



130 



3-15 



•0340 



•0301 



•0296 



+ 5 



195 



2-87 



•0361 



•0319 



•0301 



4- 18 



251 



2-75 



0370 



•0330 



•0318 



4- 12 



756 



205 



0412 



•0382 



•0353 



4- 29 



In a second experiment in the same apparatus a solution 

 made up to the same concentration as before (c 1 = *0001n. 

 Hg 2 (N0 3 ) 2 ) was employed in the cell, but instead of the cell 

 toeing directly short-circuited through the galvanometer, a 

 small reverse E.M.F. was applied in the external portion of 

 the circuit, so that the total current-producing E.M.F. was 

 reduced from the '0545 volt of the previous case to *0372 volt. 

 The results are given below. 



Empirical equation for current 



C = {4-44 - 1-20 log 10 (t -f- -28)} X 10~ 6 ampere. 



Time from start 



Current 



Current 



(mins.). 



(obs.). 



(calc). 







5-10x10-6 



510x10-6 







3-54 



357 



11 



320 



317 



19 



2-92 



290 



39 



254 



2-53 



90 



2-07 



2-10 



180 



175 



1-73 



278 



155 



1-50 



825 



095 



094 



Theoretical equation for polarization 

 V ca i c . = -0286 log 10 {l + 2-34 x!0 5 (0 + -320 Xl0~ 6 ) \/l} volt. 



Time from start 

 (mins.). 



Current 

 (amp.). 



V + CRab 



(obs.). 



' y. 



(obs.). 



V. 



(calc). 



Diff. 



43 



2-47x10-6 



•0237 



0200 



•0206 



-•0006 



95 



2-06 



•0257 



•0227 



•0231 



- 4 



150 



1-83 



•0268 



•0241 



•0244 



3 



288 



1-49 



•0283 



•0261 



•0260 



+ 1 



830 



094 



•0304 



•0290 



•0280 



4- 10 



1 



