HIST.ORY OF GALVANISM. 5 



* llem or handle, and a nozzle or tube. It is an eolipile, and 



when half filled with water or fpirit, and heated over a candle, a 



ftrong current either of vapour or of the denfe fluid will iflfueout 



accordingly as it is held. With the vapour of fpirit thus blown An halfpenny 



through the large flame of a tallow lamp, I fufed a halfpenny, lafsft * 



and foftened the ftopper of a bottle fo as to run a wire through forated. 



it ; though I muft eonfefs not without apprehenfion of the thin 



brittle veflel burning, and covering the furrounding bodies with 



flame. The lamp B, which is the eflential part, may be made The lamp appa* 



cheap; and indeed the whole would coit but a trifle. I took ra u tusls vcry 



cheap. 



a fmall lamp of that figure, 2f inches wide and \\ inch high 

 (of the fort called agitable, from the cap for the wick being 

 made to icrew in and defend the oil), and in the place of the 

 wick-pipe, I foldered a piece of a common blow-pipe. The 

 lamp colt eighteen pence, and the blow-pipe fix-pence, and the 

 combination anfwers perfectly well. 



II. 



Outline of the Hijlory of Galvanifm : with a Theory of the Aclion 

 of the Galvanic Apparatus \ By John Bo stock, M. D, 

 From the Author: 



{Concluded from Page 304.) 



^UOL. HALDANE found that the effe&s of the apparatus Col. Haldane 

 were fufpended when it was immerfed under water, and that inim f rfed thci 

 this was alfo the cafe when it was placed under the vacuum of H^difcwered 

 an air-pump. He conceived that the effects of the pile were that its a&ionit 

 not increafed by its being conneaed with the conductor of an ^0^ 

 electrical machine^ and he thought that the charging of the 

 Leyden phial was retarded when the apparatus was placed be- 

 tween its outfide and infide coatings. Upon the whole he Thinks it not 

 concludes that its effects cannot be referred to electricity. ele<aric * 

 Upon thefe experiments Mr. Nicholfon remarks, that in the Obfervations to 

 cafe where the pile was conneaed with the conduaor, the the contrary * 

 elearic ftream of the conduaor might have been in a contrary 

 direction to the elearic ftream of the pita In the experiment 

 where the pile was connected with the Leyden phial, it is cer- 

 tain that the phial could not be charged higher than the puV 



B 2 itfelf. 



