﻿Intelligence and Miscellaneous Articles, 4?77 



Let C be the current, P the polarization, and I the inequality ; 

 the current gave the following results : — 



millims. 

 C-P-I = 498] 



C = 519l (1) 



therefore P-fI= 21 J 



The current sent in the other direction, 



C-P + I = 487] 



C = 484 [ (2) 



I-P= 3 J 



Combining (l)and (2) we obtain 



millims. 



Inequality 12 



Polarization 9 



These experiments thus confirm the result found above for the 

 inequality. 



Second experiment. Sulphate of zinc treated with carbonate of zinc. 

 • — I gives very quickly 



1=3 millims. = constant; 

 upon this the current passed 



C-P+I=462, 



C=459. 

 In the opposite direction, 



C-P-I = 466, 



C=469, 

 from which 



1 = 3, P = 0. 



Calculation of the electromotive force resulting from the inequality, 

 and of that from the polarization of the electrodes. 

 We have a circuit in which three electromotive forces may be in- 

 troduced. They are proportional to the deflection produced by each 

 of them. If 500 millims. is the mean deflection produced by the 

 hundredth of the battery, the electromotive force corresponding to one 

 millimetre will be 0-00002. 



We conclude from this that the electromotive force arising from 

 the inequality is, in the case of the first solution, 

 0-00024 of a Daniell's cell, 



and with the second solution 



0-00006. 



The electromotive force resulting from the polarization is in the first 



case 000018, 



and in the second case null. 



The same method, applied to sulphuric acid of 1*08 at 27° C. and 

 to amalgamated zinc electrodes, gives 



1 = 25 millims. and C = 15 millims. 



