304" GALVANIC EXPiiRIMENTS WITH ICE. 



On a pile of 140 Exp, 5. On a pile of 140 feries of zinc, filver, and pafte- 

 ml^'neticSl^'''^'**''^' impregnated with a. folution of fait, I placed an iron 

 was fufpendedj pivot, and on this pivot a very delicate and fenfible compafs 

 ^hVhand'to Tt^ needle. The friaion was almoft nothing. I firft applied one 

 an ofcillatory hand to the bafe of the pile, and I carried the other near to 

 motim took the needle. I obferved a flow and ofcillating approach ; but 



place, but the • rr .1 • ■ , r , • t 



magnetic attrac- '"^ needle was inceilantly invited to relume the magnetic di- 



tion appeared to reftion, whence I inferred, that the polar attra6lion exceeded 



d^e^dearic.^ ^'^ *^^^ elearic. I tried then to render the tranfmiflion of the fluid 



more eafy, by making it gHde over a metallic condu6lor, as a 



brafs wire ; but the refult was the fame as when I made the 



fluid pafs through my arm. 



A common pin, Exp. 6. To the magnetic needle ufed in the preceding ex- 



fufpended in the pgriment, I fubftituted one made of a pin, the movement of 

 fame way, was ' ' *^ . . 



attraded by a which alfo I rendered very free. I approached this needle with 

 wire comnium- ||^g extremity of a brafs wire that communicated with the bafe 

 eating with the ^ , ., 1 t • 1 • • 1 • i- 1 it 



pile, at the dif- Of the pile, and I perceived it turn with rapidity, at the dil- 



tance of fome tance of a few lines, to rufti againft the wire. A fimilar com- 

 munication eftabliflied through the arms aflx)rded the fame 

 refult. 

 A filver thread, Exp,l . I placed on the fummit of the pile an iron knitting- 

 fufpended from needle, bent, and fufpended to it a filver thread, as it is called, 

 needle, placed ufed for embroidery. I completed the circle with one of my 

 on the fummit fingers, approaching the thread gradually with it. At a certain 

 attrafted'^by the ^'^^^^^ ^''^ thread applied itfelf to my finger, and remained 

 finger. adhering to it, though it was perfe6lly dry. 



When the com- Exp. 8. I repeated the preceding experiment, only form- 

 munication was jpg ^j^g communication by means of a brafs wire. The at- 

 brafs wire, vivid tractive effed equally took place, and very vivid fparks were 

 fparks were given out between the wire and the thready which oxided the 

 filve" was' ox- latter over all its furface, and melted a part of it feveral lines 

 ided, and part in length. 



The fame ' ffefts "^^^^ VaQ{e experiments were repeated agreat number of times, 

 toik place re- and alway^ with the fame Aiccefs. 



aTi*'^* h ead ^^P' ^* ^" '^^ Upper dilk of a pile of 97 pairs of zinc and 

 fufpended from a filver, I fixed an iron wire, and fufpended to ita fimilar filver 

 wire fixed to the t|-,read. At the foot of the pile was a communicating bafin; 

 fummit of the . r i • .• r 1 i^- • t j • . ^l 



pih, wis at- m which was a loiution ot fait. Dipping one hand into the 

 tradied by one bafin, and bringing the other near the thread, this immediately 

 other wib dipped Came and (luck to it. When I took my hand out of tl>e bafin, 



the 



