ANALYSIS OF THE GALVANIC PILE. 



lay along the glass, the effect was diminished, and in order 

 to prevent this delect, 1 took larger tubes, with metallic 

 cups, through which, by screws, 1 kept the chaplet fixed 

 iuthe axis of the tube; these screws, being on the outside 

 in the form of hooks, served to link the chaplets together. 

 Each of these small instruments acted immediately on the 

 gold leaf electroscope, and, by hooking them together, the 

 eifect was doubled. 



I founded at that time, on this experiment, the plan of 

 increasing the power of the new instrument so as to produce 

 Ine divergence of small metallic balls, especially by using 

 zinc plates, which I knew then could be procured. For 

 this purpose, I thought of lessening the expense occasioned 

 by the metallic caps for the glass tubes, by making much 

 longer chaplets, and of suspending these in the form of gar- 

 lands, to the ceiling of the room, by silk strings, bringing 

 only wires from their opposite extremities to a proper place, 

 where the apparatus of the small metallic balls should 

 stand. 

 Fiectrieco Such is the point at which I had arrived the 30th of May, 



1808; and this object was much forwarded in^ny paper un- 

 der the title of The Electric Column and Aerial Electroscope, 

 delivered to the Royal Society the 7th of March, 1809; 

 but the Committee of Papers not having ordered it to be 

 published in the Phil. Trans., it will now appear in a more 

 advanced state. The consequence of its not appearing at 

 the time it should have done is, that my electric column 

 has lost the merit of novelty; for, by the communica- 

 tions of the minutes at the' meetings of the Society and 

 the Committee, it had attracted attention ; and the sight of 

 it, which I did not refuse, has made it sufficiently known 

 to be already imitated. However, while its connexion 

 with the ui alysis of the Galvanic pile is not considered, 

 its principal object is lost: and moreover, till the sticking 

 of the sma-i metallic pendula, when striking, was prevented, 

 which I have obtained but lately, it could net be ranked 

 olo^ical instruments. These particulars will 

 Dy following paper. 



Windsor, 22rf of June, IS 10. 



II. 



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