On the Power ef tleSrle Jars and Batterifi. 5^31 



By tlic laft experiment it appears, that breathing into the jar had increafcd its charging ca- 

 pacity nearly in the fame proportion as it had done the batteries : after breathing, it received 

 a charge fufficient to fufe four times the length of wire it did when clean; but by the weight In 

 the eleftrometer, and alfo by thS greater number of revolutions given before the difcharge 

 happened, it might be fuppofed that the jar had received only a double charge. 



The following experiments are intended to flicw the lengths of wire, which are juft fufcd. 

 by various quantities of eledric fluid at the fame intenfity. 



Experiment 3. For this purpofe, a fecond jar was placed at the wire L, the pin marked- 

 30 was taken out, and 15 put in Its place, two inches of the fame fort of wire as ufed in the 

 laft experiment was placed in the circuit, every other part of the apparatus remaining un- 

 altered ; the machine was tlien put in motion, till B begun to afcend, when it was flopped,, 

 and before A could reach «, one of the jars was puflied from the wire L (to do which, there 

 is always fufEcient time while the eleftrometer is in motion), the difcharge was efFeiied, ani 

 the two inches of wire was juft fufed. 



Experiment 4. The jar which was pufhed away in the laft experiment was difcharged, anc^ 

 placed at the wire L, as before, and eight Inches of the fame fort of wire placed In the circuit ;; 

 the outfide coating of the jars either touched each other, or had a metallic communication. 

 All the other part of the apparatus remained as before, and the machine was put in motion^ 

 tiU B begun to afcend ; the jar was not resioved, as In the laft experiment,, but fufFered to 

 difcharge witli the other, and the eight inches of wire was fufed in the fame degree as the 

 two inches in the laft experiments. 



It is evident from the pofition of the apparatus, that the quantity of eleflrk fluid difcharged 

 in the laft experiment muft be double that of the former j yet, In repeating the experiment, 

 I had different refults, which made me again fufpe£l the edges of the wire, I therefore re- 

 folred to take round wire, and of as large a diameter as could be conveniently fufed. 



Experiment 5, ivith three jars. Iron vidre of t|^ part of an inch in diameter, and fix inches 

 in length, was placed in the circuit -, three jars were placed fo that the balls proceeding from 

 their infides touched the wire L, and their outfide coatings touched each other. The machine 

 ■was turned till B begun to afcend, tlie difcharge was caufed, and the whole length of the wire 

 was juft run into balls. 



Experiment 6y with three jurs, one renvnted. Two inches of the fame fort of wire was 

 placed in the circuit In the fame manner as the laft, and the three jars remained ; the ma- 

 chine was turned till B begun to afcend, tlien one of the jars was drawn away, confequently 

 f)nly two difcharged, and the wire juft run into balls as the laft. 



Experiment 7, -with four jars. Wire of tto part of an inch was taken, and four jars placed 

 in contafl: with the wire L, with their outfide coatings in contacl: with each other, and eight 

 inches of wire was placed In the circuit ; the weight in the electrometer remained as before ; . 

 the machine was then put in motion till B begun to afcend, the difcharge was efFe£ted, and 

 the wire was fufed, and run into balls. The experiment was repeated with the fame fort of 

 wire 8i inches long ; the difcharge was juft fufRcIent to run it into balls. 



Repeated with nine inches of the fame fort of wire, and the difcharge caufed it to be red 

 hot the whole length. 



Experiment- 



