-2h> 



MR THOMAS ANDREWS ON THE RELATIVE 



that of two large plates of sueh superficial area. This arrangement, however, 

 illustrates intensified galvanic action. 



The whole were arranged in a voltaic series, as shown in sketch — 



SCALED 

 TERMINAL 





( 



-\ 



-> 





f\ 





— ^ 





r> 





p 





r> 



r\ o r* 









Uj 



<<> 











| 





| 





I 



















to 



5: 







1 



i 



p 



j. 



~ 



1 



= 



~-f 



' 



9 





- ~ l 







:.-_., 



-:— 



K 



i 





Fig. 3. 



and attached to the terminals of a galvanometer, the deflections were as 

 recorded under 



Table J. 



Time of 

 Observation 



Deflection in 

 Degrees. 



Electro-Chemical 

 Position of Bright Part 



June 



3rd 



, 7.35 

 7.40 



17-00 

 14-00 



Positive. 



>> 





7.50 



11-00 



!> 



>> 





8.0 



9-00 



)> 



» 





8.10 



7-50 



>J 



>> 





8.20 



6-75 



" 



>i 





8.30 



6-00 



JI 



)) 





8.40 



5-00 



>' 



;> 





8.50 



4-75 



1) 



:; 





9.0 



4-50 



>> 



>) 





9.10 



4-00 



>; 



>> 

 )> 





9.20 

 9.30 



3-75 

 3-50 



J) 



i> 





9.40 



3-25 



» 



» 





9.50 



3-25 



>' 



jj 





10.0 



3-00 



>) 



n 





10.10 



3-00 



>> 



V 





10.20 



2-75 



>> 



J' 





10.30 



2-50 



>t 



i) 





10 35 



2-50 



'.) 



June 



4tb 



> ' 



1-00 







5th 

 6th 



> 



TOO 

 0-75 



>> 

 11 



The galvanic mischief induced by iron scale is a matter of such importance 

 that special attention has been directed to the measurement of this, as will be 

 seen in these experiments (see Tables). 



