562 On the charging Capacity of coated Electrical Jan. 



duced a discbarge to the electrometer ball at the same di- 

 stance, and the same length of wire was slightly blued. 



Experiment XVIII. — The jar was then breathed into* 

 and a discharge was produced at the same distance, but 

 the wire was not fused. 



Experiment XIX. — The same jar was breathed into a, 

 second time, and a discharge was caused at the same di- 

 stance, and the wire was fused into balls exactly the same 

 as when the paper rings were on. 



Experiment XX.— A third jar nine inches high and four 

 inches diameter, the whole containing about 61 square 

 inches, when rubbed clean and dry* two turns of the plate 

 caused a voluntary discharge to the outside coating. 



Experiment XXL— A paper ring was pasted on both 

 sides close to the coating, and one inch from the top, after 

 which no voluntary explosion could be obtained, but the 

 electric fluid was seen to run over the brim of the glass to 

 the outside coating as quick as the machine could give it ; 

 the discharging distance was seven-eighths of an inch : it 

 had not power sufficient to make any impression on one 

 inch of wire. 



Experiment XXIT. — The paper rings were then cut nar- 

 rower at different times, and tried, which increased the dis-< 

 charging distance, when there remained only one quarter of 

 an inch which seemed to be the most favourable above the 

 coating: the discharging distance was If inch,, and the 

 wire was fused, and dispersed in balls. 



Experiment XXIII. — The paper rings were taken off, and 

 the jar carefully breathed into : six turns of the plate caused 

 a discharge to the electrometer standing at the distance of 

 \\ inch, and one inch of wire was fused, and dispersed in 

 balls, equal with the last experiment. 



The above experiments are sufficient to prove that paper 

 rings pasted on to electrical jars in the manner explained, 

 do hinder voluntary explosions, and increase the charging 

 capacity of coated jars, in the same degree as breathing into 

 them. 



Further experiments and observations, setting forth the 

 advantages that electricians are likely to obtain from the 

 above discovery, will be the subject of a future paper. 



LI. Method 



