J34 ANALYSIS OF THE GALVANIC PILE. 



was by 100 groups in each column, forming a pile of 200 

 groups, 



1. I observed and noted the divergences in the electro- 

 scopes, positive at A, the pewter side, and negative at B, 

 the silver side. 



2. No shock was felt. 



3. The glass tubes being applied, though the electric 

 signs ceased at the extremities, no chemical effect was pro- 

 duced in the water of the tubes. 



4. The condenser applied to the usual points a, c, b, no 

 residua of electric signs appeared. 



5. Dismounting the pile, I did not perceive any impres- 

 sion of the water on the pewter plates. 



Exp. 17. Exp. 17. I mounted a pile with a sufficient number of 



groups formed of zinc, silver, and cloth imbibed with the 

 solution of marine salt, to produce at its extremities the 

 same electric signs as the above pile ; which I obtained by 

 25 groups in each column, 50 in the whole, and the follow- 

 ing were the results. 



1. I felt the shock. 



2. The glass tubes being applied, the electric signs disap- 

 peared at »he extremities, and the usual chemical effects 

 were produced in the water. 



3. I applied the condenser to the points a, c, b, and found 

 very sensible residua. 



Exp 18. Exp 18. I mounted again the pile of 200 grou ps pew- 



ter and silver, but I imbibed the cloth with the solution of 

 marine salt. 



1. The same electric signs were produced at the extrerai- 

 inities. 



2. I felt the shock. 



3. The glass tubes being applied, the electric signs dis- 

 appeared at the extremities, and the chemical effects were 

 produced at the usual points in the water of the tubes. 



4. Then also, the condenser being applied to the points 

 a, c,, b, sensible residua of electric signs were found in the 

 usual order. 



5. Lastly, having dismounted the pile, I found 01$ the 

 pewter plates many spots produced by calcination. 



These 



