i)f ccaied Electrical Jars. ' 261 



as before, and it appeared that the greatest charge it could 

 take had not the least effect upon the wire: thus it appears 

 that a paper ring so applied docs not increase the charging 

 capacity of' jars in the same degree as breathing. 



Experiment VIII. — The jar was highly charged, and ex- 

 amined in the dark : the paper ring appeared luminous all 

 round the uppermost edge. 



Experiment IX. — The ring was taken off, and pasted on 

 in the inside close to the coating : 23 turns caused a volun- 

 tary explosion through the ring to the outside coating. 



Experiment X.— A second ring three quarters of an inch 

 broad was pasted on close to the other: the same number 

 of turns produced a voluntary explosion, and the paper was 

 torn by the discharge, which was repaired and left to dry. 



Experiment XI. --When dry, no voluntary explosion 

 could be obtained. 



Experiment XII. — Its greatest power was' then tried, and 

 was found to be exactly the same as in Experiment V\.{\\ hen 

 it was breathed into) : it discharged at two inches distance, 

 and the same length of wire was fused into balls. 



Experiment XIII. — A second jar was taken of a larger 

 size, being 13 inches high, and its coating seven inches; 

 in the whole it contained about 1 90 square inches: after 

 being rubbed clean and dry, it was applied to the conductor 

 of themachirre: twelve turns of the plate produced a volun- 

 tary explosion to the outside coaring. 



Experiment XIV. — A paper ring was put round the un- 

 coated part on the outside at about 1-|- inch distant from 

 the coating : eleven turns of the plate produced a voluntary 

 explosion to the outside coating : the paper ring was then 

 pushed down to the coating, alter which no voluntary ex- 

 plosion to the coating could be obtained ; but it discharged 

 itself to the electrometer ball standing at the distance of Sc- 

 inches from the knob of the conductor. 



Experiment XV. — The same sort of wire, two inches 

 Jong, as used in Experiment VI, was hung to the electrome- 

 ter, and the discharge made it blue with several bendings, — 

 a proof that it had been nearly red hot. 



Experiment XVI. — A ring of common writing- paper 

 one inch broad Avas pasted on the inside close to the coat- 

 ing, and when dry no voluntary explosion to the coating 

 could be obtained ; but it discharged itself to the electro- 

 meter ball standing at the distance of 2-} inches, and the wire 

 was fused into balls. 



Experiment XVII. — The paper rings were now taken off, 

 and the micoaled part made clean and dry : 19 turns pro- 



R 3 dueed 



