Soc. Edin r 



DIAGRAM I. 



'/ustratingthe change of Electro-Chemical position between some Steel and Wrought-lron Plates, see Table I. 



Plate XXXIV. 



Solution in which the Plates remained constantly 

 immersed during the experiment. 



Curve showing the varying Electro-Chemical position of the 

 Steels in Galvanic connection with Wrought-Iron. 





£th Normal Standard Sulphuric Acid. 





l Plate (bright) forming one 

 Soft Siemens-Martin Steel Plate 



Wrought-lron Plate (bright) forming one 

 element with a Soft Bessemer Plate (bright) 



Time 

 from 



Positive position of 

 Steels. 



Negative position 

 of Steels. 



2 



td 





"Galvano- 



Electro-Chemical 



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Deflection of Galvano- 

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Electro-Chemical 



position of 

 the Soft Bessemer. 



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