Experiments with the Elementary Voltaic Battery. 35 
Copper constant at 8S inches, Zinc dipped to 
1 in. 2 in. 3 in. 4 in. 5 in. 
in 28° 30° Bye) ooo 34° 
SOG 29 Bult 32 303 
These experiments were several times repeated, so that all the 
effects of decline, as arising from successive immersions, might be 
observed, and still we found an uniform increase of effect to arise 
from an enlarged zinc surface. 
3. The relative quantities of the two metals were now varied, 
and the order of the observations alternated. 
Copper constant at 3 inches, Zinc dipped to 
Line sine gsi Sin. oid tiny a I. em. Gin. Sin.) din.) in’. 
3598 LOM TLS. 11S” 10° SOT Ss Osc) MLOSO RTOS IOS O) 5850 
4. We now returned to the use of plates, cut to a size, proper 
for entire immersion, as in the first experiments. 
Copper constant at 3 sq. inches. 
zinc 2 sq. in. z. 16. Ze 2. z. 16. Z. 2. z. 16. 
a 53° 62° 53° 66° 50° 67° 
These results, which are selected from our record of similar ones, 
compel us to differ from the Messrs. Rogers, in thinking that an 
increase of effect is produced by a decrease of zinc surface. 
5. In the next set of experiments which we prosecuted, we 
were desirous of determining whether the constant decline which 
we observed to accompany repeated immersions, had relation, most 
to the changes effected in the copper or zinc surfaces. 
Copper and zinc, each 3 square inches, which had been previ- 
ously used. 
Copper and Zinc A. 
after 5’ interval. again, after 5/ 
1. 70° 69° 60° 
2. 68 64 58 
3. 66 62 54 
New copper with zinc A. New zine with copper A. 
1. 94° ]. 50° 
2. 86 2. 50 
3. 82 3. AT 
The above zinc and copper, named new. 
1’ 46° 
2! 44 
3 43 
