1878.] 



Contact Theory of Voltaic Action. 



205 









Zero. 



Heading. 



Deflection. 



1069 -0 



1082 '2 



13 '2 



69 -0 



54 '1 



14 *9 



Do \j 



ST -0 



ol U 



-LO U 



67-2 



52 -5 



14 7 



66 -6 



80 -0 



13 -4 



66 -8 



52 -0 



14 -8 



Mean 





14 '0 





I of a Cell. 





1063 -0 



1056 -0 



7 -0 



64 "0 



70 -6 



6 -5 





^1 -ft 





65 -5 



71 *6 



6 1 



64 -8 



56 -5 



8-3 



63 -4 



69 -1 



5 7 



Mean. 





.6-8 



Taking fractions 0*1, 0"2, &c, of 68'2, which is the mean deflection 

 representing the electromotive force of a whole cell, we get the num- 

 bers A of Table II. The numbers B are the means of Table I. 



Table II. 



A. . 6*8 13-6 20'5 27 3 341 47 7 54*6 61 '4 68 '2 



B. . 6-8 14 -3 20 7 27 -9 34 -4 48 *4 55 -3 61 1 68 -2 



Thus the deflections are proportional to the differences of potential 

 between the lower plates, a result which could not have been anti- 

 cipated. At the distance of 16 mm., the results given in Table III 

 were obtained, and here again we find that the deflections are propor- 

 tional to the difference of potential between the lower plates. 



Table III.- 



Zero. 



1065 -1 

 61 -8 



59 -5 



60 -6 



61 -3 



-9th March, 1876. 



One Cell. 



Reading. 



1093 -0 

 23 -5 

 91 -5 

 26 -5 

 96-0 



Plates 16 mm. apart. 

 Deflection. 



27 -9 

 38 -3 

 32 -0 

 34 -1 

 34 7 



p 2 



