JY4 EXPERIMENTS ON THE ELECTRIC PILE. 



taking its dec- the fortieth pair from the bottom, the; fir ft where the fepara- 

 ■ifSSff"'" tJon of Bennet>s electrometer was diftinftly perceptible, the 

 battery was charged to the lame intenfity as the electrometer 

 indicated when brought into contact with that part of the 

 pile, giving here a feparation of one line. The effect was 

 preciiely analogous when the battery was charged by fimilar 

 iultantaneous contact with the pile at the iixtieth, eightieth, 

 or hundredth pair, and fo on. 

 The z'nc being In this pile, the filver being the lowermoft of the metals, 

 tridty pofiu vc.°* the elearicity was pofitive at top, and the elearicity com- 

 municated to the interior furface of the battery was the fame, 

 the contact being made with the fuperior part of the pile. 



The metals being xhe order of the metals was then inverted, and the ex- 

 inverted, the . . 

 elearicity penments repeated at different heights of the pile as before, 



charged. with fimilar refults. 



Shocks taken by They now proceeded to examine the fhocks given by the 

 tonftwoTnchVs Datterv charged at different heights of the pile; for which 

 in diameter from purpofe they employed two conductors of copper, two inches 

 e artery thus - m ( jj ame t er ^ hdo* in wet hands. Beginning with the battery 

 charged at the twentieth pair, they very diftinctly perceived 

 the paifage of the ftream from the conductor into the hand, 

 and from the hand into the conductor. One gentleman pre- 

 fent, Mr. Vander Ende, felt it as far as the wrifts. When 

 the battery was charged by forty pairs, real mocks were felt 

 at the wrifts : when by fixty, the mocks were very percepti- 

 ble at the elbows : and they gradually increafed, till the 

 fhocks extended to the moulders with confiderable ftrength, 

 when the battery was charged by the whole pile. 

 The flecks Thefe mocks, however, were not equal to thofe given by 



hSmJ* PllC the P iIe itleIf ' but onI ^ about haIf tbeil * ftren g th J the mock 

 ftronger. from a hundred pairs appearing to be equal to that of the bat- 



tery when charged by two hundred. 

 Comparative ex- Having continued thefe experiments till nothing more 

 vhhan cledVical could probably be learned from them, the comparative effects 

 machine. f $e electrical machine, con lifting of a plate of glafs thirty- 



one inches in diameter, were tried with the fame battery. 

 Precautions ufed This experiment requiring particular precautions, that the 

 thefe^xp'ri" 8 contact of the conductor might not impart more electricity to 

 meats. the battery than was furnifhed by the action of the machine 



during the contact, Dr. Van Marum formed a communication 

 between the conductor and the ground by touching it with 



one 



