40 
Proceedings of Royal Society of Edinburgh. [; 
Spirit Flame. 
Sensitiveness of electrometer = 60*7 scale divisions per volt. 
Hence 300 scale divisions corresponds approximately to 5 volts. 
Difference of Potentials. 
+ to plate, B, - to 
sheath. 
- to plate, B, + to 
sheath. 
Volts. 
Deflection. 
Time. 
Deflection. 
Time. 
Divisions. 
Min. Sec. 
Divisions. 
Min. Sec. 
2 
+ 35 
3 0 
- 80 
3 0 
4 
+ 92 
3 0 
-133 
3 0 
8 
+ 205 
3 0 
-265 
3 0 
10 
+ 240 
3 0 
-311 
1 15 
Initial. 
Mean. 
12 
9-5 
+ 300 
0 53 
-300 
0 38 
18 
15-5 
+ 300 
0 25 
-300 
0 16 
44*5 
42-0 
+ 300 
0 4*5 
-300 
0 4 
89 
86-5 
+ 300 
0 2-5 
-300 
0 2*5 
Bunsen Flame. 
Sensitiveness of electrometer = 607 scale divisions per volt. 
Difference of Potentials. 
+ to plate, B, - to 
sheath. 
- to plate, B, + to 
sheath. 
Volts. 
Deflection. 
Time. 
Deflection. 
Time. 
Divisions. 
Min. Sec. 
Divisions. 
Min. 
Sec. 
2 
+ 10 
3 0 
- 99 
3 
0 
4 
+ 73 
3 0 
-159 
3 
0 
8 
+ 200 
3 0 
-300 
2 
20 
Initial. 
Mean. 
12 
9'5 
+ 300 
1 48 
-300 
0 
48 
16 
13*5 
+ 300 
1 12 
-300 
0 
30 
19 
16*5 
+ 300 
0 46 
-300 
0 
18 
31 
28*5 
+ 300 
0 15 
-300 
0 
13 
47 
44-5 
+ 300 
0 11 
-300 
0 
8 
75 
72-5 
+ 300 
0 65 
-300 
0 
5 
94 
91-5 
+ 300 
0 5 
-300 
0 
4 
§ 3. If the leakage in these experiments were proportional to 
the difference of potential, then the product of mean difference of 
