422 Scientific Intelligence. 
one half of the negative electricity of the external coating passing to the 
interior of the jar; the action now however does not cease, as would be 
rimary directions; they rapidly reach a maximum, and gradually di- 
minish, ceasing altogether when one half of the positive el-ctricity has 
reac 
the jar. If now the resistance of the circuit be further gradually in- 
particles, in cooling, passing through a red heat. 
Duration of the yellow white portion, 0°00003 sec. 
“ ‘“ gr “ 00000 id 
re . “« 000006“ 
Total, 000013 
In this experiment a single Leyden jar was used, the coating being = 
0-2006 square meter. It was found that increasing the length of the 
spark, and the area of the electrical surface, each lengthened the duration 
of the total discharge. ‘ 
‘It was also found that when two jars were used, each having 4 coated 
= 02006 square meter, a tube of sulphuric acid sp. gr. 1°25, 
Imm wide and 9™™ Jong, being introduced into the circuit, only one 
oscillation remained, and with a tube 12mm long the continuous dis- 
eharge generally be, 
_ By 
pper wire, 
of a tube of sulphuric acid sp. gr. 126, 
long, the duration of the discharge was len ae 
oscillatory in its nature, and the band on the grouné 
1ese bands, sometimes 9 inches 1 
photographs where the indications of a 
