gjQ EFFECTS OF ELECTRICITY AND HEAT. 



be employed in forming them into one plate, as fuggefted, in 

 vour laft, when a deflagrating power is required. 



The intermediate parts exprefs the wooden blocks, which mud 

 be well covered with cement on every fide, and inferted into 

 grooves, as the zinc and copper plates ufually are. 



The engraving that referred to my laft communication! vvas 

 inaccurately explained, as the dotted work was faid to exprefs 

 the zinc, whereas the acid liquor was denoted by it. 

 I remain, Sir, 



With much refpeft, 



Your obedient fervant, 

 I. R. I. 



VI. 



On the Difference between the EffeSts of Ekdricity and of Heat, 

 By Cit. Berthollet*. 



DifFerence be- 1 HAVE thought it important to determine the difference 

 tween ek<ft.icity ^j^;^,,^ ^^^^^ between the aflion of the ekaric fluid and that 

 <nid caiouc. 



of caloric, and the caufe which renders their effeds fimilar, 



more efpecially, as in the lefTons of the Normal fchools this 

 fimililude of elfedt made me adopt the opinion of thofe who 

 have confidered the eleftric fluid to be caloric itfelf ; I confe- 

 quently requeued permifllon of Citizen Charles to make ufe of 

 his powerful apparatus in the experiments which appeared to 

 me to be necelTary on this fubject. With that civility which 

 thofe engaged in fimilar purfuits are always fure to experience 

 from him, he undertook to perform them himfelf. I now give 

 the refult, fuch as it was communicated to me by Guy Lufiac, 

 who allilted in the experiments. 

 i'lafini was not A wire of platina was fubmitted lo fnocks which were nearly 

 much heated by fl^ong enough to etfea its combuflion ; and to be fatisfied of 



an eledtnc (hock '^ ° i i i • i 



nearly capable of ihis, a ftiock was excited by which a great part of the wire 



burning it. ^vas melted and difperfed; afterwards the (hocks employed 



were a little weaker, and immediately after each the wire was 



touc-hed to judge of the temperature it had acquired : a heat 



was fejt, which was difli]ated in a few minutes, and which, 



♦ From his Eflai de Statique Chimique. 



at 



