HYDROGEN AND OXYGEN IN CONTACT WITH HOT SURFACES. 
29 
Experiment I. 
July 6, 1904. 
Normal electrolytic gas. Surface in 
“ normal ” condition. 
Experiment II. 
July 7, 1904. 
Original mixture 3H 2 + Oo nearly. 
P. 
h. 
t. 
p h. 
p o. 
*0, 
hours. 
miHims. 
hours. 
millims. 
minims. 
0 
369 ■ 8 
— 
0 
252-3 
. 85-9 
— 
— 
1 
268-8 
0-1386 
1 
200-5 
60-0 
0-0997 
0-1558 
2 
206-3 
0-1268 
2 
165-4 
42-5 
0-0917 
0-1528 
3 
151-0 
0-1296 
3 
136-0 
27-8 
0-0895 
0-1633 
4 
110-5 
0-1312 
4 
110-8 
15-1 
0-0894 
0-1890 
5 
77-8 
0-1354 
5 
94-2 
6-8 
0•0856 
0-2203 
6 
52-6 
0-1413 
51 
87-5 
3-5 
0-0836 
0-2527 
8 
25-2 
0-1458 
6“ 
83-3 
1-4 
0-0802 
0-2980 
Experiment III. 
Experiment IV. 
July 8, 1904. 
July 9, 1904. 
Normal electrolvtic gas over “ 
lydrogenised ” 
Normal electrolytic gas after prolonged exhaustion 
surface. 
at 430“. 
t. 
P. 
h. 
t. 
P. 
h 
hours. 
millims. 
hours. 
millims. 
0 
425-8 
— 
0 
390-0 
— 
1 
267-2 
0-2024 
1 
257-2 
0-1809 
2 
150-2 
0-2262 
2 
178-0 
0-1704 
3 
79-8 
0-2424 
3 
125-8 
0-1638 
4 
36-7 
0-2661 
4 
91-3 
0-1576 
5 
14-2 
0-2954 
The ratio H 2 /0 2 in the residual gas from Experiment I. was exactly 2 - 0. For the 
residual gas in Experiment III. the ratio was, however, 2'2, a clear indication that 
hydrogen had been occluded by the catalysing material during the treatment to which 
it had been subjected between Experiments II. and III. 
At the conclusion of Experiment IV., oxygen was circulated over the surface at 
430° for 36 hours in order to completely “ dehydrogenise ” it. Alter pumping the 
residual oxygen out of the apparatus, the rate for normal electrolytic gas was now 
found to he very little more than half the normal value, as follows :—- 
