34 
DR. W. A. BONE AND MR. R. V WHEELER ON THE COMBINATION OF 
Experiment I. 
July 25, 1904. 
Normal electrolytic gas. T = 400°. Surface in “normal” condition. 
Rate of circulation = 1 in 60 minutes. 
t. 
P. 
k\. 
t. 
P. 
h. 
hours. 
millims. 
hours. 
millims. 
0 
447-5 
— 
4 
115-8 
0-1468 
1 
325-5 
0-1381 
5 
82-4 
0-1469 
2 
241-4 
0-1341 
6 
58-5 
0-1473 
3 
166-7 
0-1429 
7 
41-4 
0-1477 
a 
The values of “& 1} ” calculated from the expression — log jj, show that, as in the cases 
of porous porcelain and magnesia, the rate of steam formation is directly proportional 
to the pressure of the dry gas, and, therefore, that the process is a surface 
phenomenon entirely. In the next three experiments (II. to IV. inclusive), the 
influence of oxygen on the catalysing power of the surface was studied. In 
Experiment II., a mixture originally corresponding to H 2 + 20 2 was employed, with 
the following results :— 
Electrolytic gas + excess of 
T = 400°. 
Experiment II. 
July 25, 1904. 
oxygen. The original mixture corresponded to H 2 + 20 2 . 
Rate of circulation = 1 in 60 minutes. 
t. 
P H, 
p o„ 
%2- 
k O- 2 . 
hours. 
millims. 
millims. 
0 
130-7 
261-4 
— 
_ 
1 
103-5 
248-0 
0-1013 - 
0-0228 
2 
82-1 
237-1 
0-1009 
0-0212 
3 
60-7 
226-5 
0-1110 
0•0207 
4 
44-9 
218-6 
0-1160 
0-0194 
5 
28-9 
210-5 
0-1310 
0-018S 
5| 
22-9 
207-7 
0-1376 
0-0180 
6 
17-9 
205-1 
0-1439 
0-0175 
7 
12-1 
202-1 
0-1476 
0-0159 
8 
8-9 
200-7 
0-1458 
0-0144 
9 
6-1 
199-2 
0-1478 
0-0131 
these numbers show that, initially, the rate of steam formation was proportionately 
rather slower than with normal gas in the previous experiment; it was, however, 
gradually accelerated as the experiment proceeded, until after the fourth hour it had 
