228 
MR. J. ZELENY ON THE VELOCITY OF THE IONS 
Table XVIII.—Moist Hydrogen. Positive Ions. 
Voltage of outer 
cylinder. 
Electrometer deflection 
in 30 seconds. 
Descent of gasometer 
in 40 seconds. 
Cells. 
Divisions. 
Centims. 
+ 6-6 
5-25 
10-38 
+ 6 
775 
10-23 
+ 5-4 
10-25 
10-18 
+ 4-6 
14 
10-38 
t)*4r 
10-75 
10-25 
+ 6 
7-75 
10-18 
+ 6'6 
5 
10-16 
The results are shown in curve I. of fig. 16. 
The corrected value of U = 43’3 centiras. per second. 
A = 15 - 9 volts. 
43'3 
v = 5‘118 -z^rz — ■ = 4‘73 centims. per second, which reduced to 76 centiras. 
* J 0 X 1.0 u 
pressure, = 4’80 centiras. per second. 
T = -,~'l = '068 second. 
43’o 
Besides the water vapour, the gas in this case contained 1*5 per cent, of air. 
A summary of the results obtained with dry hydrogen containing 3 *4 per cent, of 
air is given in Table XIX. On account of the smaller electrometer readings the 
Table XTX. — Dry Hydrogen. Summary of Ptesults. 
Reference 
number. 
X. 
U. 
A. 
T. 
Tempera¬ 
ture. 
Gas 
pressure. 
Ionic a 
Negative. 
elocity. 
Positive. 
1 
2-95 
21-2 
+ 
6"65 
•14 
°C. 
21-4 
76-3 
5-56 
•) 
mJ 
2-95 
21-6 
+ 
773 
•14 
21-4 
76-3 
— 
5-15 
3 
2-95 
21-8 
+ 
7-14 
•14 
21-4 
76-3 
— 
5-33 
4 
2-95 
21-9 
+ 
7-37 
•14 
21-4 
76-3 
— 
5-18 
5 
2-95 
21-6 
— 
5-79 
•14 
21-4 
76-3 
6-52 
— 
6 
2-95 
21-4 
— 
5-75 
•14 
21-4 
76-3 
6-49 
— 
7 
2-95 
21-4 
- 
5-85 
•14 
21-4 
76-3 
6-39 
— 
8 
2-95 
21-4 
+ 
7-14 
•14 
21-4 
76-3 
— 
5-24 
9 
2-95 
35-4 
+ 10-35 
•083 
20 
76-5 
— 
5-97 
10 
2-95 
35-3 
+ 10-79 
•083 
20 
76-5 
— 
5-71 
11 
2-95 
35-0 
— 
9-03 
■084 
20 
76-5 
6-77 
— 
12 
2-95 
35-0 
— 
9-24 
■084 
20 
76-5 
6-60 
— 
13 
2-95 
34-9 
— 
8-90 
•084 
20 
76-5 
6-84 
— 
14 
2-95 
34-7 
+ 11-10 
•085 
20 
76-5 
— 
5-45 
15 
2-95 
25-7 
+ 
8-08 
■115 
20 
76 4 
— 
5'55 
16 
2-95 
25-7 
+ 
7-90 
•115 
20 
76-4 
— 
5-67 
