ANALYSIS OF THE GALVANIC PILE. 119 



fects will be noticed at the end of each wire in the glass Apparatus do- 

 tubes; for which purpose, these ends are indicated by. the scn e * 

 numbers 1, 2, 3, 4. During these chemical effects, the 

 electric stales of three points in the circuit will also be in- 

 vestigated ; namely, a, the point of connexion between the 

 extremity A of the pile and one of the glass tubes ; c, the 

 ring which connects the two tubes; and b, the point of 

 connexion between the second tube and the extremity B of 

 the pita. 



I proceeded at first in a very complicated manner, de- 

 scribed in my work, to the intended dissections of the pile, 

 by small conductors interposed between different ternary ar- 

 rangements of its three component parts; but in resuming 

 these experiments, 1 used a more simple method, by form- 

 ing tripods with two pieces of small brass wire, soldered to- 

 gether with soft solder in the shape of a T, as represented 

 at fig. 3, PI. IV, the three extremities of the wires, turned 

 downwards, form three ieet a, a, a, one eighth of an inch 

 high, which thus produce the commui lcatiou of the tripods 

 with the group on which they rest by only three small 

 points; and the wires themselves being a little bent down- 

 wards, the group above rests also on the tripod by three 

 points b, b 9 b. 



In all the experiments, the same order of succession of 

 the metals was preserved in both columns, notwithstanding 

 their different dissections by the tripods: in A, the column 

 begins at the bottom by a zinc plate, thus terminating at 

 the top by a silver plate ; and in B, a silver plate begins 

 the column at the bottom, which thus ends at the top by a 

 zinc plate. I mention this circumstance on account of a 

 question concerning the denomination of the extremities of 

 the pile by the metals, which will occur in the course of the 

 experiments. 



From what has been said above of the three different ter- 

 nary groups that may be composed in the same succession 

 of the three component parts of the pile, fig. 2, which re- 

 presents the different states of the latter in these experi- 

 ments, will be easily understood ; but it must be recurred 

 to, when each experiment is related. No. 1 represents a 

 portion of the continuous pile , which is the same from one 



end 



