1878.] 



Contact Theory of Voltaic Action. 



211 



Zinc and copper connected by distilled water at 17° C. Zinc is 

 negative to copper. 



Zero. Beading. Deflection. 



953 960 -2 7 '2 



952 947 -0 5 -0 



952 960 -0 8 -0 



952 946 -5 5 '5 



951 '9 961 -0 9 -1 



952 945 -0 7 *0 

 952 961 -0 9 -0 



952 -9 946 -2 6 7 



An interval of 15 minutes. , 



953 961 -0 8 -0 

 952 -8 945 -1 7 7 



Mean 7 '32 or 168 volt. 



Zinc and copper metallically connected. Zinc positive to copper. 



Zero. Beading. Deflection. 



953 -0 926 -0 27 -0 



952 7 990 -0 37 -3 



951 -0 920 -3 30 7 



950 1 985 1 35 -0 



950 -0 919 -5 30 -5 



950 -2 984 -6 34 1 



951 -0 918 -0 33 -0 

 951 1 985 -2 34 1 



Mean 32 7 or 751 volt. 



Zinc and copper connected by saturated pure zinc sulphate at 17° C. 

 Zinc negative to copper. 



Zero. Beading. Deflection. 



952 -0 



961 -5 



9 -5 



951 '9 



944 -2 



7 7 



951 '8 



960 -0 



8-2 



951 -9 



943 1 



8-8 



952 -0 



960 -0 



8-0 



952 1 



944-6 



7 -5 



