26 DR. W. A. BONE AND MR, R. V. WHEELER ON THE COMBINATION OF 
of experiments with normal electrolytic gas at 450°. The rate of circulation was 
1 in 60 minutes throughout. 
Experiment. 
Date. 
Condition of surface. 
ki 
for time 
interval 0 to 
1 hour. 
Remarks. 
XXXIV. 
June 24, 1905 
Normal 
0-0636 
XXXV. 
XXXVII. 
„ 25, 1905 
„ 27, 1905 
>> 
After exposure to hydrogen 
at 454° for fourteen hours 
0-0636 
0-0382 
Rate of combination pro¬ 
portional to pressure 
throughout each ex¬ 
periment. 
XXXVIII. 
„ 29, 1905 
After two days’ continuous 
exhaustion. Normal 
0-0612 
XL. 
July 1, 1905 
After exposure to oxygen at 
450° for sixteen hours 
0-0879 
Stimulus rapidly wore off. 
Surface again normal 
after five hours. 
XLI. 
„ 2, 1905 
After further exposure to 
oxygen at 450° 
0-0976 
In experiments with an excess of either of the two reacting gases, the surface was 
always more than normally active, and, after an initial period of acceleration, the rate 
of combination always remained proportional to the partial pressure of the hydrogen. 
This is shown by the results of the two following experiments with mixtures 
originally corresponding to 3H 2 + 0 2 , and H 2 +30 2 , respectively. In the latter case, the 
rate of combination after the first hour was about 2'5 times normal, and the results 
are best analysed by calculating two sets of values for “ ,” the one set for the whole 
experiment, the other for the course of events after the first hour. 
Experiment XXXVI. 
Experiment XXXIX. 
June 26, 1905. 
June 30, 1905. 
Original mixture = 3H 2 4- 0 2 . T = 
= 450°. 
Original mixture = Ho + 3CL. T = 
450°. Rate of 
Rate of circulation = 1 
in 60 minutes. 
circulation = 1 in 60 minutes. 
t. 
P H, 
p o. 
* : o 2 . 
t. 
P H., 
p o. 
Z H, 
k o 2 . 
hours. 
millims. 
millims. 
hours. 
millims. 
millims. 
0 
380-4 
130-7 
— 
— 
0 
131-0 
391-3 
_ 
_ 
_ 
2 
304-3 
92-6 
0-0485 
0-0748 
1 
107-0 
379-3 
0-0779 
_ 
0-0136 
3 
269-1 
75-0 
0-0501 
0-0804 
2 
70-5 
361-1 
0-1345 
0-181 
0-0174 
4 
239 • 7 
60-3 
0-0501 
0-0840 
3 
48-1 
349-9 
0-1450 
0-174 
0-0162 
5 
215-1 
48-0 
0-0495 
0-0870 
4 
31-5 
341-5 
0-1547 
0-177 
0-0148 
6 
190-7 
35-8 
0-0500 
0-0937 
5 
21-9 
336-7 
0-1554 
0-172 
0-0131 
7 
169-1 
25-0 
0-0503 
0-1026 
6 
15-5 
333-5 
0-1545 
0-168 
0-0116 
9 
134-5 
7-7 
0-0502 
0-1366 
7 
11-0 
331-3 
0-1504 
0-165 
0-0104 
