197 
of coated Electrical Jars 0 
Experiment XIX.— The same jar was breathed into 
a second time, and a discharge was caused at the same 
distance, 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 sixty- 
four square inches, when rubbed clean and dry, two 
turns of the plate caused a voluntary discharge to the out- 
side coating. 
Experiment XXL-*- A paper ring was pasted on both 
sides close to the coating, and one inch from the top, af- 
ter 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 im- 
pression on one inch of wire. 
Experiment XXII. — The paper rings were then cut 
narrower at different times, and tried, which increased 
the discharging distance, when there remained only one 
quarter of an inch which seemed to be the most favoura- 
ble above the coating : the discharging distance was one 
inch and three eighths, and the wire was fused, and dis- 
persed 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 one inch and a quarter, and one inch of 
wire was fused, and dispersed in balls, equal with the 
last experiment. 
The above experiments are sufficient to prove that pa- 
per rings pasted on to electrical jars in the manner ex« 
plained, do hinder voluntary explosions, and increase 
the charging capacity of coated jars, in the same degree 
as breathing into them. 
