198 On De Luc’s Electric Column. 
in acommon pile, both electrical and chemical (as Mr. De 
Luc terms them) being produced. 
In the second dissection, the tripods separated groups 
composed‘of the two metals in contact, and the « ‘et cloth 
in contact only with the s7ze plates. In this were produced 
electric effects but not chemical; no extrication of gas or 
calcination of wire was perceived i in a glass tube filled with 
water placed between the extremities of this pile, but the 
e!eetroscopes at each end showed electric signs. When the 
cloth was wetted witha solution of marine salt, the shock, 
was produced both in this and the first disseenion, 
In the third dissection the tripods divided the groups 
composed of the two metals in contact; but the wet cloth, 
‘in contact only with si/ver. In this experiment no electric 
or chemical effects were produced. 
Mr. De Luc mounted a pile of 76 groups of xine and 
‘silver, but instead of weé cloth used new cloth, which had 
stood some time in his room, his hygrometer being about 40°. 
Electric sizns were produced, but weaker than when wet 
cloth was used. When the g/ass tubes were applied, there 
was no appearance of chemical effects. He afterwards sub- 
stituted writing-paper for cloth; the electric signs were 1n- 
creased, but no chemical Siecre ere produced, After 
‘various ‘trials with different metals, he formed piles of zinc 
and Dutch-gilt paper, connecting the plates with a silken 
thread, in the form of chaplets, which chaplets be inserted 
in class tubes, with metallic caps and screws, much like, 
as appears from the description, to the columns or tubes, 
which in my letter! have suggested might be called Electric 
Rods. This mode of fitting them up. was. adopted before 
mine were made. 
To the third communication from him is a figure of 
the Eleciric Column, mounted on glass pillars, with Elee- 
troscopes and other parts of his apparatus. The whole 
series of these papers, if collected in one volume, wonld 
form a valuable addition to the books already published on 
Electricity. 
The bells which I mentioned were placed in commuii- 
cation with three (Electric) Rods on the 14th of March 
1810, continued to ring until the 24th, on which day J 
could not hear them for about a minute; afier which they 
rang again, The next day I also thought. they ceased for a 
short time, but have great doubts whether J was not mis- 
taken: from that day (the 25th of March) they did not, 
to my knowledge, once cease until the 4th of September, 
a period of 163 ‘days. On the 4th, at about ten o’clock at 
night, 
