322 
Proceedings of Royal Society of Edinburgh . [sess. 
300 Scale Divisions, equivalent to 6'2 volts, to begin with in 
each case. 
Flame, 
or Fire. 
Length of 
Funnel between 
Burning Sub- 
stance and 
Copper Plates. 
Leakage 
in Two 
Minutes. 
Centi- 
Scale 
metres. 
Divisions. 
Spirit flame 
66 
292 pos. 
9 9 
5 9 
287 neg. 
9 9 
112 
253 pos. 
9 9 
9 9 
254 neg. 
5 9 
343 
22 pos. 
9 9 
5 9 
20 neg. 
9 5 
236 
24 pos. 
9 > 
99 
20 neg. 
9 9 
160 
40 pos. 
99 
5 9 
46 neg. 
9 9 
244 
165 pos. 
5 5 
9 9 
187 neg. 
Charcoal 
9 9 
54 pos. 
9 9 
99 
57 neg. 
{ 
{ 
{ 
Remarks. 
Funnel of 15 ‘3 cm. bore all vertical. 
9 9 9 9 9 5 
5 9 9 9 9 9 
99 59 99 
Funnel 114 cms. vertical of 15*3 cms. 
bore ; and 229 cms. horizontal of 
3*8 cms. bore. 
Same vertical, and 122 cms. horizontal 
of 3*8 cms. bore. 
Same vertical, and ‘46 cms. horizontal 
of 3*8 cms. bore. 
Same vertical, and 130 cms. horizontal 
of 15*3 cms. bore. 
9 9 9 9 5 5 
99 99 99 
§ 13. In connection with these last experiments, attention may 
he directed to an experiment described by Prof. Schuster, in which 
he uses an insulated metallic tube bent round at the upper end, to 
prove that “ it is not only the flame itself which conducts, but also 
the gases rising from the flame.”* He discovers electric conduct- 
ance in products of combustion mixed with air quite out of sight 
from the flame. 
* Prof. Schuster, on “Atmospheric Electricity,” at Royal Institution, 
February 22, 1895. 
