»44« ANALYSIS or THE galvanic pile. 



ser. The first experiment on each association of metals 

 was made with the papers loose between the groups, in or- 

 der to observe afterward the differences resultins: from the 

 pasting them on one or the other of the metals. 

 Exp. £*. Exp. 22. With 20 groups zinc and silver, separated by 



loose pieces of paper. 



Silver side on the pillar, zinc side applied to the cond. 



pos. 0-35. 

 Zinc side • • silver side neg. 0*35. 



The difference between the extremities being commonly 

 equal, with only opposite signs, when these extremities are 

 in turn applied to the condenser, T shall suppress the sign 

 when the quantity only of the difference will be the object of 

 consideration. 

 fcxp. 23. Exp. 23. This will give the first proof of the advantage 



of pasting the paper on the metal which becomes negative 

 in contact with the other; this being the case of silver in 

 the above pile. 



20 groups zinc and silver separated by loose paper* • • '0*35 



20 groups paper pasted on the silver* 'the gold 



leaf struck the side. 



Zinc and silver (or copper) are, as yet, the metals which, 

 being associated, differ the most in their electric states, and 

 for this reason they are commonly used in the pile; but in 

 order to ascertain whether the advantage manifested by the 

 above experiment, of pasting the paper on the metal which 

 becomes negative in each group, was general, or only a cir- 

 cumstance attached to silver and zinc, I thought of em- 

 ploying some metal, which became negative with zinc, but 

 positive with silver; I found pewter such an intermediate 

 metal, from the following experiment. 



Exp. "4. Exp. 24. With two piles, each of 20 groups, the first 



Pewtemeg. zinc v.nd pewter, the second pewter and silver ; the groups 

 with zinc, pos, . i 



wtu silver, separ; ted by loose pieces ot paper', each pile being alter- 

 nately placed in communication with the ground by one 

 side, while the other communicated with the condenser. 



lit pile 



