62 
DR. W. A. BONE AND MR. R. Y. WHEELER ON THE COMBINATION OF 
Experiment I. 
September 20, 1904. 
Normal electrolytic gas over reduced copper gauze. T = 214°. Rate of circulation = 1 in 40 minutes. 
t ... . 
0 
1 
4 
1 
2 
3 
¥ 
1 
11 
l-£ hours. 
p. . . . 
384 • 3 
291-8 
230-0 
176-0 
148-5 
117-7 
87 • 0 millims. 
l h . . . . 
_ 
0-4780 
0-4460 
0-4520 
0-4128 
0-4180 
0-4360 
The values “ &j,” calculated in each case on the assumption that the whole fall 
in pressure was due to steam formation, have really no precise significance, since 
there was a slight permanent oxidation of the metal (207 millims. of oxygen 
disappeared in this way during the experiment), and the ratio H 2 /0 2 for the residual 
87 millims. of gas was 47. The hydrogen which disappeared as steam was, however, 
184'4 out of the 256'2 millims. originally present, or about 76 per cent., in 1 \ hours. 
Inasmuch as a number of other experiments showed that the slight oxidation of 
the surface was independent of, and had but little influence on, the catalytic process 
proper, the reaction constant for the latter, h l = (P3683, deduced from the partial 
pressures of the hydrogen at the beginning and end of the experiment, may serve as 
a fair index of the velocity for comparison with the results obtained in subsequent 
experiments with the oxidised gauze. 
At the conclusion of the above experiment, oxygen was circulated over the gauze 
at 450°, for about 20 hours, until no further absorption of the gas occurred; its 
surface was now completely covered with a thick layer of cupric oxide. The 
temperature of the combustion tube was then lowered to 214° again, and the rate of 
combination for normal electrolytic gas over the “ oxidised ” surface determined as 
follows :— 
Experiment II. 
September 23, 1904. 
Normal electrolytic gas over “oxidised ” gauze. T = 214°. 
Rate of circulation = 1 in 40 minutes. 
t. 
P. 
K 
7-i 
after 1st hour. 
f. 
P. 
h. 
h 
after 1 st hour. 
hours. 
millims. 
hours. 
millims. 
0 
437-3 
— 
— 
5 
222 ' 4 
0-0587 
0-0634 
i 
399-3 
0-0395 
— 
6 
187-5 
0-0612 
0-0656 
2 
345 • 4 
0-0511 
0-0627 
( 
155 - 6 
0-0641 
0-0682 
3 
299-6 
0-0547 
0-0622 
8 
125-4 
0-0678 
0-0718 
4 
259 • 6 
0-0566 
0-0622 
■ 
| 
