29*5 On the .Ele^lricify excited hy tig 



from all the contafts of feveral metals that immediately fuc- 

 ceed each other, or the force with which this fluid is at laft 

 impelled, is ahfolntcly the fame, or nearly fo, as that which 

 It would have received by the immediate contaft of the firlk 

 metal with the laft without any intermediate metals, as I 

 have afcertained by direct experiments, of which I fhall have 

 occafion to fpeak hereafter. 



' A feries of 30, 40, or 60 of thefe tumblers connefted with 

 each other in this man-ner, and ranged either in a ftraight 

 or curved line, or bent in every manner poflible, forms the 

 whole of this new apparatus, which at bottom and in fub- 

 ftancc is the fame as the other columnar one above defcribedj 

 a-; the efiential part, which confifts in the inmiediatc commu- 

 nication of the different metals which form each couple, and 

 the mediate communication of one couple with the other, 

 <i.nz.. by the intervention of a humid conduflor, exift in the 

 one as well as the other. 



In reo'ard to the manner of trving thefe tumblers, and the 

 different experiments for which they may be employed, there 

 'is no need of fiying a great deal after the ample explanation 

 I have already given rcfpefting the columnar apparatus. It 

 may be readily comprehended, that to obtain a fliock it will 

 be fullicient to immerfc one hand into one of the tumblers, 

 and a finger of the other hand into another of the tumblers 

 at a confiderable diftance from the former: that this fliock 

 will be ftronger the further thefe glafles are from each other; 

 tlint is to fav, in proport-on to the number of the interme- 

 diate cl-iires, and confequently, that the llrongeft fhoek will 

 })e received v.'hcn you touch the firft and lalt end of the 

 chain. It will be readily comprehended alio, how and why 

 the experiments will fucceed much better by grafping and 

 boldino- faft in one hand, well moiftened, a pretty large 

 plate of metal (in order that the communication may be 

 more perfect, and formed in a great number of points), and 

 touching with this plate the water in the tumbler, or rather 

 the metallic arc, while the other is immerfed in the other 

 iilftant tumbler, or touches with a plate, grafped in the like 

 manner, the arc of the latter. In a word, one may com- 

 prehend and even tbrelle the Hiccefs of a great variety of 

 ^ expcximent-s 



