Soc. EniN R 



DIAGRAM D. 



Illustrating some of the Comparative Results in Table D. 



Plate XXX. 





Waters in which the Bars were immersed. 





Sea Water. 



An Acid Colliery Water. 



[PTION. 



Curves Showing the comparative Electro-Chemical 

 positions of the steels, &c 



Curves showing the comparative Electro-Chemical 

 positions of the Steels, &c. 





Positive 

 position 

 of Metals. 



Negative position of Metals. 



Positive 



position 



of Metals. 



Negative position of Metals. 





Degrees of Deflection of Galvanometer. 



Degrees of Deflection of Galvanometer. 





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Iron Scale in connection with 

 Wrought-Iron in connection with 



Zinc in connection with 



Iron Scale in connection with 

 Wrought-Iron in connection with 



Zinc in connection with 







































































































•" 









