50 Laws of the Elementary Voltaic Battery. 



11. Another set was now made, by immersing one of the plates 

 6 inches, and varying the surface immersed of the other from 1 inch 

 to 10 inches. Five minutes were allowed between the immersions 

 as before. 



Zinc 5 inches, copper dipped to 



12. In the following experiments the plates were not removed from 

 the solution between the immersions. One of the plates being plung- 

 ed to 5 inches ; the other was immersed by a sliding movement to 

 1 inch, 3 inches, &;c. up to II inches. After finishing with one met- 

 al, the plates were removed for 5 minutes, and then adjusted for 

 another set. 



Zinc 5 inches, copper dipped to 

 1 inch. 3 inch. 5 inch. 7 inch. 9 inch. 11 inch.* 

 1' 28° 50° 61° 76° 80° 90° 



2' 27 47 59 70 73 90 



3' 25 45 56 67 70 87 



* The last inch was perfectly fresh metal, which probably accounts for the great 

 increase of action. 



