On two new Classes of Galvanic Conductors. S^Q 



ihe 4th and 5th class. Thes6 facts add to the advantage of 

 novelty, that ot presenting problems which it would be in- 

 teresting to resolve, and new views iu Galvanic inquiries. 



§ I. 



Conductors, tvh'tch in the Conjilct of the two Poles isolate iJx 



negative Effect white they continue to propagate positive 



Electricity, 



When we apply separately to each of the poles of the 

 pile the flame of a lamp of spirits of wine, it acts like a 

 perfect conductor ; but when applied simultaneouslv to the 

 two poles it totally isolates the negative effect, while it conti- 

 nues to conduct with the same energy the positive electricity, 

 and consequently from this partial isolation the closure of 

 the Galvanic circle does not take place. 



If at either of the poles of a pile well isolated, of 100 

 couples or thereabouts, we apply an electrometer formed of 

 gold leaves, they soon a.ssume the degree of divergency 

 which corresponds to the energy of the pile, and to the more 

 or less perfect isolation bv the ambient air of the opposite 

 pole. When the instrument is stationary in its divergency, 

 we present to the metallic wire of the opposite pole the 

 flame of a spirit of wine lamp perfectly isolated ; the electro- 

 meter does not increase in divergency ; but the instant we 

 put the flame in communication with the ground, by intro- 

 dticing into it a metallic wire not isolated, the electrometer 

 assumes a divergence as strong as if we had made the isola- 

 tion of the opposite pole to cease. 



We may also take it radically away from each of them, 

 each pole being in communication with an electrometer, by 

 a metallic wire. If an isolated flame touches one of these 

 wires, the electrometer with which it corresponds loses no 

 part of its diverojencey, but it is entirely taken away from it 

 the instant we place the flame in direct communication with 

 the ground. 



We see these two effects united by preparing two flames 

 perfectly isolated, and by conducting into each one of 

 the metallic wires proceeding from the extremities of the 



pile. 



