Soc. Edin r 



DIAGRAM G. I. 



'ustraiing the change of Electro-Chemical position between Cast Metal and Wrought- Iron Plates, see Table G 1. 



Plate XXXII. 



Solutions in which the Plates remained constantly 

 immersed during the experiment. 



Curve Showing the varying 



E 



lectro-Chemical positioi 



J of the 

 Iron. 





Sea Water. 



\t\v Normal Standard Sulphuric Acid. 



Cast Metal in Galvanic connection with wrought- 



n Plate (bright) forming one 

 h a Cast Metal Plate (bright). 



Wrought-Iron Plate (bright) forming one 

 element with a Cast Metal Plate (bright). 



Time 



Positive position of 

 Cast Metal. 



Negative position of 

 Cast Metal. 





on of 



in Degrees 

 a Is of 



Electro-Chemical 



position of 

 the Cast Metal. 



Deflection of 

 Galvanometer in Degrees 



at intervals of 

 time during three hours. 



Electro-Chemical 



position of 

 the Cast Metal. 



from « ^ 

 Commencement u ¥• '** 



of X O & 

 Experiment, jj 4 1 



a 



S3 e 



L> 1) 

 i OJ 



- >_ 

 311 be 

 i v 



L 2 



2 







2 1 s 0" j 



The Black Line indicates the deflections caused by the Cast Metal in Galvanic connection with Wrought-Iron in Sea Water. 



Dotted ,, ,, ,, >> »» ii » >> >> >» " " >> .. >> rth Normal Standard Sulphuric Acid. 



S 



P 

 P 



125 

 100 



P 

 P 









1 





























5 



015 



P 

















... 





















OZS 



P 







































P 





0-2S 



P 





































f 



0-10 



P 







































P 



000 



Z£RO 





































f 



0-10 



N 





















■■ 

















010 



N 







































P 





0/0 



N 





































f 



0/0 



N 







































P 



25 



N 





































f 



oso 



N 





] 



















■■. 















so 



N 





j 



































P 





0-50 



N 





































9 



oso 



N 







































P 



0-60 



N 









































0-75 



N 

























« 













75 



N 





































J 



P 



75 



N 





\ 

































0-7S 



N 





\ 



































P 



75 



N 





\ 

































i 



75 



N 





































75 



N 







































P 



0-75 



N 





































r 



0-75 



N 







































P 



75 



N 





































. 



0-75 



N 







































0-75 



N 

























< 















P 





75 



N 







\ 































l 



o is 



N 



1 HOUR 





\ 































7 



P 









































7 



P 



so 



N 





































f 



P 













\ 































P 



30 



N 



























i 











. 



P 



OSO 



N 







































P 















\ 



























1 



P 



OSO 



N 











1 

















i 











1 



P 











































P 

















\ 



























P 











































P 











































P 







2 HOURS 





































P 









































7 



P 



O-90 



N 















\ 

























P 



















\ 























1 



P 











































P 











































P 





















\ 





















7 



P 









































1 



P 









































5 



P 









































5" 



P 









































r 



P 







































r 



P 







3 HOURS 















1 





















