flf Of« TUS VOLTAIC SATTiar. 



time the contact wtt» a^in made. Three Hvcher^ th# 

 oaint* wire were now rfticlered red hot with the »anie ap- 

 ptrtifance a? the niae irichef* in the (ir*>t expf^rimcnt. 



»my. f. Four Wedj^wood batteries were iHXt employed. At the 



firit contnct lb luches of the same wire became aliglitlj r<«i 

 UQ$rl and the coutact was preterved^ till the effect of i^ui* 

 Mpn eutireiy terminated. One minute was suffered to 

 elapse, when, on removinj^ the ceutaet, 6 incites of wire 

 were ignited in the same degree as in the preceding eNperi* 

 aicuts. 



Hh^S; An interval of three tninntes was suffered to pass with* 



•ut contact; >\l the end of this time, two batterit-s rendered 

 MX inches* of the Kanie wire red hot, and four batteries pro« 

 duced asimihir effect on li inches. 



ftevtrkt. Theunif»im result of the-e experiments, in which the 



rjnitiiij* power increases in the same proportion, however 

 rariuble the action of the battery, renders it hi<;;hly prol?a- 

 ble, that in Dr. L)avy*«» experiments the biiiterics were ac» 

 eidentally char^trd with acid mixtures of variable strength, 

 the increase in his first experiment being as the square of 

 the numbers. 



|[^^4, To ascertain whether the ratio of increase continued the 



same when a larger combination is employed^ ten bat- 

 teries were charged with fresh acid, of the same stren}^th« 

 Five of these ignited at the first contact Itt inches of the 

 same wire as that employcHl in the former experimeotb ; and 

 on repeating the experiment with ten batteries, an eifedb 

 pn^cisely similar was produced on 36 inches. 



Exp. 5. A short interval was suffered to elapse, when five batteries 



ignited 15 inclies of wire; and the same effect was produced 

 on 30 inches by tea batteries. 



Exp. 6. Platina vrtre, rVtr^h of an inch diameter, was taken. Tew 



batteries (^a a diminished state of action) maintained a wliit^i 

 heat in 5 inches of this wire. On repeating the experiment 

 with five batteries a similar effec-t was produced on 2^ inchtt 

 of the flame wire. 



Th« power in These experiments indicate, thnt the conclusions of Dr. 



ciiract propor. t^jn^^n^Qj, ^n^l Mr. Cuthliertson are legitimate j and ther 



tlOO to tnO , 



•umber, prove al*o, that the iirnitinff poictr not only %nr.rea$es m exact 



proportion to the number of plates j but that tbi«r.itioof 



iocrease 



