Soc. Edin r _ _ _ „ 



DIAGRAM 



lustratingihe change of Electro-Chemical position between some 



G. 



Steel and 



Wrought-Iron Plates 



, set 



Plate XXXI. 



j Table G. 



Waters 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. 







Sea Water. 





Plate (bright) forming one 

 lard Cast Steel Plate (bright). 



Wrought-Iron Plate (bright) forming one 

 element with a Soft Bessemer Plate (bright). 



Time 



Positive position 

 of Steels. 



Negative position of 

 Steels. 







■alvano- 

 grees 

 f time 

 hours. 



Electro-Chemical 



position of the 

 Hard Cast Steel. 



Deflection of Galvano- 

 meter in Degrees 

 at intervals of time 

 during three hours. 



Electro-Chemical 



position of 



the Soft Bessemer 



Steel. 



from »" oi - 

 commencement JJ 0, 



c 00 00 \ 

 01 V 4) ' 



Experiment. ^T ^Z 



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° c 



\ 8P 



Meridian 



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4. 





















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