METHOD OF INCREASING AN ELECTRICAL CHARGE. 21 1 



JExp. 8. The jar was highly charged, and examined in Exp. 8. 

 the dark. The paper ring- appeared luminous all round the 

 uppermost edge. 



Exp. 9. The ring was then taken off, and pasted on in Exp 9. 

 the inside close to the coating. Twenty-three turns caused 

 a voluntary explosion, through the ring, to the outside 

 coating. 



Exp. 10. A second ring, f of an inch broad, was then Exp, 10. 

 pasted on close to the other. The same number of turns 

 produced a voluntary explosion, and the paper was torn by 

 the discharge; after which it was repaired, and left to dry. 



Exp. 11. When dry, no voluntary explosion could be Exp. il. 

 obtained. 



Exp. 12. Its greatest power was then tried, and it was Exp. 12. 

 found exactly the same as in Exp. 6, when it was breathed 

 into; it discharged at 2 inches distance, and the same length 

 of wire was fused into balls. 



Exp. 13. A second jar was taken of a larger size, being ^j^p j3^ 

 13 inches high, and its coating 7 inches, it contained about 

 190 square inches. After being rubbed clean and dry it 

 was applied to the conductor of the machine, 12 turns of 

 the plate produced a voluntary explosion to the outside 

 coating, 



Exp. 14. A paper ring was put round the uncoated part Exp. 14. 

 on the outside, at about ji inch distant from the coating. 

 Eleven turns of the plate produced a voluntary explosion 

 to the outside coating. The paper ring was tlien pushed 

 down to the coating, after which no voluntary explosion to 

 the coating could be obtained, but it dischorticd to the 

 electrometer ball standing at the distance of 2 inches and ^ 

 from the knob of the conductor. 



Exp. 15. The same sort of wire as used in Exp. 6, two j^xp 15, 

 inches long, was hung to the electrometer, and the dis- 

 charge made it blue, with several bendings: a proof that it 

 bad been nearly red hot. 



Exp. iG. A ring of common writing pai'er, one inch Exp. 16: 



broad, was pasted 'on the inside close to the coating; and 



when dry no voluntary explosion to the coating could be 



obtained, but it discharged itself to the electrometer ball 



P 2 standing 



