Laws of the Elementary Voltaic Battery. 



51 



1 inch. 

 1' 43^ 



2' 40 



3' 38 



Copper 5 inches, zinc dipped to 

 inch. 5 inch. 7 inch. 9 

 37° 33° 31° 



35 32 31 



35 32 31 



13. In the preceding experiments, the solution used, was always 

 composed of sulphuric arcid and water. A solution containing one 

 part nitric acid, (specific gravity, 1.333) to 66 water, was now prepar- 

 ed and employed in a similar set of observations, of which the follow- 

 ing are the details. 



Experiments with nitric acid solutions, 1 to 66. H galls. ; slips, 

 10 inches long, 1 inch broad and 2i apart. Intervals between the 

 immersions, 3 minutes. 



1st. set. — Zinc immersed 2 inches, copper dipped to 



14. We now made a number of observations by sliding the plates 

 alternately, and through great distances at each time. Columns Z 

 and C, represent the inches of zinc and copper immersed. The 

 deflection was noted 1 minute after each change. 



