Voltaic Batteries, S^c. 



177 



the strength or density of the acid mixture, in the relative di- 

 stances, and the relative dimensions of the two plates. 



144. In accordance with this design, the second table will 

 show the results of a like series of observations to the first, 

 but made under a change in one of the conditions of the ge- 

 neral arrangement, viz. in the strength of the acid mixture ; 

 whilst all other conditions remain the same as before. 



Table (No. 8). 



1 45. Showing the total superficial areas, in square inches, of 

 the copper-plates ; and the time, in seconds, in which each j'ields 

 the jjjth of a cubic inch of hydrogen at the different distances. 



Area of zinc plate 1 square inch, specific gravity of acid 

 mixture 1*013, the depth 6 inches. Trough the same as be- 

 fore. Temperature 55° F. 



14-6. It is shown by the results contained in this table, that 

 the plates of the small standard couple, on being separated 

 from one another through the several relative distances of ^ 

 of an inch and 1 2 inches, afford the same kind of results as 

 have already been exhibited in tables Nos. 5 and 6. 



i4;7. These results are similar as regards the alternation in 

 amount of action occurring at one particular position within 

 that range, and in the progressive diminution of that action, 

 which takes place as the distances increase from the first to 

 the last position ; that amount is equal to 170" at the distance 

 o{\ of an inch, and to 4'75'^ at 12 inches. These results are 

 placed in the first perpendicular column of this table, under- 

 neath the number 2, representing the total extent of surface 

 of the copper-plate by which they are yielded. 



Its. Then, on substituting at each distance, larger copper- 

 plates in succession in the place of the standard one, we have 

 the results thus afforded, shown in the horizontal lines of this 

 table. 



14-9. We see that at the distance of 1 inch, the standard 

 amount 1 70" is obtained by a plate having a surface of 4 square 

 inches, or one twice the size of that needed at a ^- of an inch ; 



Phil. Mag, S. 3. Vol. 13. No. 81. Sept. 1838. N 



