1878.] Contact Theory of Voltaic Action, 207 



useful in showing how any error in adjusting the plates affected the 

 deflection. 



Table V. 



Distance m) 6 ? g 9 10 11 12 13 14 

 millimetres J 



Eatio 3 '30 3 "55 3 '84 4 13 4 '48 4 -83 5 -21 5 '62 6 -05 



In subsequent experiments we used the distances 10*9 and 10*0 mm. 

 As the electrometer was twice taken to pieces, its quadrants being 

 altered in position, we took great care in the later experiments to 

 determine the value of our deflections in each case. 



Table VI.— 12th March, 1876. Plates 10 '9 mm. apart. 

 Zinc and copper metallically connected. Zinc positive to copper. 



Zero. 



Reading. 



Deflecti< 



1097 -1 



1133 I 



36 -0 



85 -5 



1048 -0 



37 -5 



77-1 



1112-0 



34 -9 



80 -0 



1040 -6 



39 -4 



82 -1 



1119 -1 



37-0 



86 -8 



1047 -0 



39 -8 



83 -0 



1114 4 



31 -4 



86 -3 



1046 -0 



40 -3 



91-2 



1123 -0 



31-8 



90 -0 



1047 I 



42-9 



Mean, , , 





. . 37 "1 



Zinc and copper connected by an acid solution of zinc sulphate at 

 10° C. Zinc negative to the copper. 



Zero. 



Reading. 



Deflection. 



1034 -8 



1026 -1 



8-7 



34*1 



41 -8 



7-7 



36 '9 



30 1 



6-8 



37-1 



49 -1 



12-0 



39 7 



31 1 



8-6 



40 '0 



51 -5 



11 -5 



45 -0 



35 1 



9-9 



43 -0 



55 -1 



12 -1 



43 -0 



35 -0 



8-0 



42 -3 



52 1 



9-8 



Mean. 



9'5 



