ELECTRO-CHEMICAL POSITIONS OF WROUGHT IRON, ETC. 



213 



Table G. 



Galvanometer Experiments with Bright Steel, Wrought Iron, and Cast Metal Plates, §i 



Description. 



Percentage 

 of Corn- 

 Dined 



WATERS IN WHICH THE PLATES WERE IMMERSED. 



Sea-Watek. 



Wrought Iron Plates (Bright) forming 



one Element with each of the 



following Bright Steel, <&c. Plates. 



Plates covered with'Scale (Magnetic 



Oxide) placed in Galvanic connection 



with Bright Plates from the same 



Piece of Steel, &c. 







Deflection of 



Galvanometer in 



Degrees. 



Electro-Chemical 



Position of the 



Metals. 



Deflection of 



Galvanometer in 



Degrees. 



Electro-Chemical 



Position of the 



Metals. 















Average. 



Highest. 





Vverage. 



Highest. 





Soft Siemens-Martin steel, . 



' 0-170 



2-69 



3 00 



N 



.3-51 



4-00 



P 



Soft steel (Firth's), 



0-46 -i 



1-25 



0-77 



1-50 

 2-25 



N for 3 minutes, 

 afterwards P to 

 end of Experi- 

 ment 



>3-27 



375 



P 



Wrought iron, .... 



Trace 



... 







2-92 



3-00 



P 



Soft Bessemer, . . 



0-150 ) 



0-37 



0-83 

 0-28 



0-50 

 2-75 

 0-50 



N for 3 minutes 

 P for 120 „ 

 N afterwards 



U-96 



5-00 



P 



Hard Bessemer, .... 



0-510 1 



1-05 

 0-75 



1-50 

 1-25 



Nfor 20 minutes 

 P afterwards 



\ 3-27 



4-25 



P 



Hard Siemens- Martin steel, . 



0-720 ] 



1-25 

 0-14 

 0-15 



1-50 



0-25 

 0-50 



Nfor 10 minutes 

 P for 85 „ 

 N afterwards 



( 2-58 



3-75 



P 



Hard steel (Firth's) . 



1-407 \ 



1-06 

 0-21 

 012 



1-75 



0-50 

 0-15 



Nfor 15 minutes 

 P for 80 „ 

 Nfor 55 „ 



il-63 



3-75 



P 



Cast metal,* 



2-010 



1-50 



t 



2-00 



F { 



0-93 



0-47 



■*- 



4- 



2-75 

 0-60 



Nfor 30 minutes 

 P afterwards 



Graphitic carbon, 1'50. 



Eemarks. 



t Each result is the average of about thirty observations which were taken at regular intervals extending 



over three hours. 

 X Each result is the average of twenty-three observations taken in each case at equal distances of time, 



each experiment extending over two hours. 



VOL. XXXII. PART I. 



2 M 



