BLCCTRCC EFFECTS OF FRICTION. 



time of its greatest action. This experiment therefore di- 

 rectly shows how siiihU is the quantity of electric fluid, 

 which, modified in the pile, produces such great chemical 

 and physiological effects ; and the following will prove, that 

 the motion of the electric fluid is the same in both instru-^ 

 ments, though produced by different causes. 



Exp. 2. Exp, 2. While the machine is in motion, if I loosen the 



silk thread which holds up the hook, 22» of the wire belong- 

 ing to the glass tube with water, 23, in order that it may 

 fall into the hook, 21, and that the communication may be 

 thus established between the rubber d^\A the prime couductor 

 through the water of the glass tube ; at the instant that the 

 hooks come into contact with each other, the very small 

 quantity of electric fluid there in motion pervading the 

 water, the gold leaves fall in both electroscopes, and never 

 rise though the machine be kept in motion. This is the 

 ^ame ettect as is produced on the column in exp, 29 of the 

 fprqaer paper ; for the divergence ceases also in both its 

 electroscopes, vvhen a similar tube connects its extremities: 

 in both cases, the electric fluid, which tends to accumulate 

 on one side, passes instantly to the other, and thus keeps up 



Trdofs that the equilibrium. That such is the effect of the circulation 



circulat^. "' ^^ ^^'^ ^^^ ^"^ *^*' same fluid set in motion, by friction 

 in the electric machine, and by the association of the two 

 metals in the column, will be proved by the effects of /nc- 

 tion, an instance of which is already seen in the former 

 case. 



In the above experiment, yrirtzon is exercised between 

 two bodies, one of which ranks among the best conductors, 

 namely brass ; however the effect is observed upon it, be- 

 cause it is insulated: the other is the glass cylinder, which, 

 passing under the brass rubber, certainly takes electric fluid 

 from it, since, transmitting some to the prime conductor, 

 and by this to the electroscope IJ, the latter diverges posi- 

 tively ; and since at the same time the fcraw takes off some 

 ^Mid from the electroscope 39, which thus diverges ^lega- 

 ti-pely. 



Effect of the This experiment shows moreover what is the effect of the 



amalgam on fnetallic amalgam laid on the rubbers of the usual electric 



common lub- n^i i r l 



bers. machines. The base ot those rubbers must be a cushion. 



