1878.] 



Contact Theory of Voltaic Action. 



215 



Zero. Beading. Deflection. 



1082 -5 1084 -2 1 7 



82 -6 79 -2 3 '4 



82 -2 85 7 3 '5 



82 -5 78-9 3 -6 



83 -2 86 -0 2 -8 

 83 -4 79 '8 3 -6 

 83 -9 86 7 2 -8 



Mean 3 "0 or '074 volt. 



Zinc and distilled water (16° 0.). Zinc negative to water. 



Zero. Reading. Deflection. 



1083 -0 1086 7 3 7 



82 -0 75 -2 6 -8 



82 '8 86 -0 3 -2 



82 -8 77 -9 4 '9 



82 '6 86 '6 4 -0 



82 -3 75 -1 7 -2 



81 -6 85 -8 4 -2 



82 -0 75 -5 6 -5 

 82 -0 86 '9 4 -9 

 82 -3 76 -2 6 1 



Mean 5 15 or 126 volt. 



Copper and pure saturated copper sulphate (16° C). Copper positive 



to liquid. 





to liquid. 





Zero. 



Reading. 



Deflection 



1085 -0 



1085 1 



01 



85 1 



83 1 



2 -0 



85 -0 



85 7 



7 



84 -8 



83 -0 



1 -8 



85 -0 



85 1 



1 



85 -0 



82 -5 



2-5 



84 -9 



85 -0 



01 



84 7 



82-5 



2-2 



83 7 



84 1 



0*4 



83 1 



81 -5 



1-6 



Mean 



1 15 or -028 volt. 



