|Soc. Edin r 



DIAGRAM H. 



'rating the change of Electro-Chemical position between Steel, Wrought-Iron, and Copper Plates, see Table H. 



Plate XXXIII. 



Water in which the Plates kemained constantly 

 immersed during the experiment. 



Curve showing the varying Electro-Chemical position of the 







Sea Water. 





bright) forming one element 

 iemens-Martin Steel Plate. 



Copper Plate (bright) forming one element 

 with a Wrought Iron Plate (bright). 



r 



lime 



Positive position of the Steels. 



Meridian. 







Salvano- 

 igrees 

 )f time 

 hours. 



Electro-Chemical 



position of 

 the Soft Siemens- 

 Martin Steel. 



Deflection of Galvano- 

 meter in Degrees 

 at intervals of time 

 during three hours. 



Electro-Chemical 



position of 



the Wrought 



Iron. 



from 3 Jj 



Commencement K £ 



rtf « a 



Q C 



Experiment. « n j 



Hi 

 V 



Q 



8 



_~3 Degrees 

 . OS Degrees 

 _ Ql Degrees 

 . t^ Degrees 

 . M Degrees 

 - tO Degrees 



. I— 1 Degree. 



Magnetic 





P 

 P 



4 SO 

 9 00 



P 



P 













..■••' 





/■ 



• 





.i 



1 





















a 









P 



9 10 



P 







1% 





































O 

 o 



rr 



p. 



T 

 IT" 



— i 



3' 

 i 



3' 

 h 

 » 



3" 





P 



9 SO 



P 

















































P 



9 IS 



P 





-i 



\ 



\ 



V 



































P 



9 15 



P 





i 







s 



\ 



































P 



9 50 



P 



1 Hour 



j 







































e deflections caused by the Soft Siemens-Martin Steel in Galvanic connection with Copper in Sea Water. 

 „ „ „ „ Wrought-Iron „ ,, „ ,, ,, „ „ 





P 



9 SO 



P 















\ 



\ 





























P 



9 25 



P 

















\ 





























P 



9 00 



P 



















\ 



























P 



8 15 



P 



















\ 



























P 



8 SO 



P 





















, 

























P 



8 25 



P 



2 Hours 











































P 



8 00 



P 













































P 



775 



P 













































P 



7 75 



P 























ft 























P 

















































P 

















































P 







3Hours 























1 

























