14 
DR. W. A. BONE AND MR. R. V. WHEELER ON THE COMBINATION OF 
excess of either of the two reacting gases the rate of combination was always mainly, 
if not entirely, proportional to the partial pressure of the hydrogen; and (3) that the 
catalysing material occluded hydrogen, but not oxygen, at dull red heat. 
First Series.—Normal Electrolytic Gas with Surface A at 450°. 
The following two experiments were made at the outset of the research with the 
object of testing Bodenstein’s statement that the rate of combination in contact with 
porcelain is in accordance with the equation for a reaction of the third order (loc. cit.). 
The material was less porous than that used in most of the subsequent experiments, 
and the rate of circulation considerably slower, namely, a complete circuit in about 
two hours. The temperature of the combustion tube was 450° throughout each 
experiment, and pressure records were taken every twelve hours. In the following 
tables :— 
t = time in hours from the beginning of each experiment; 
T = temperature of the combustion tube; 
P = corrected pressure of the dry gas in the apparatus; 
Jc 1} h 2 and k 3 are the “ constants” calculated from the equations for reactions of the 
first, second and third orders respectively. 
Experiment I. 
October 29 to November 2, 1903. 
T = 450°. Rate of circulation = 1 in 120 minutes. 
T = 450' 
Experiment II. 
November 4 to 9, 1903. 
. Rate of circulation = 1 in 120 minutes. 
t. 
P. 
h. 
to 
X 
o 
h x 10 s . 
t. 
P. 
h. 
to 
X 
o 
# o 
h x 10 s . 
hours. 
millims. 
hours. 
millims. 
0 
469-4 
— 
— 
— 
0 
465 • 6 
— 
— 
— 
12 
330-4 
0-0127 
75 
19 
12 
324-0 
0-0131 
78-2 
20 
24 
229-0 
0-0129 
93 
30 
24 
228-6 
0-0129 
92-8 
30 
3G 
167-2 
0-0124 
107 
43 
36 
163-9 
0-0126 
109-8 
45 
48 
120-9 
0-0123 
128 
67 
48 
116-1 
0-0125 
134-7 
72 
60 
89-4 
0-0120 
151 
100 
60 
84-6 
0-0123 
161-2 
112 
72 
66-2 
0-0118 
180 
155 
72 
60-7 
0-0123 
199-0 
185 
84 
48-3 
0-0117 
221 
252 
84 
42-9 
0-0123 
251-9 
321 
96 
36-0 
0-0116 
267 
400 
96 
28-6 
0-0126 
341-8 
634 
108 
27-8 
0-0113 
313 
597 
108 
20-6 
0-0125 
429-5 
1088 
120 
21-0 
0-0112 
379 
943 
120 
14-6 
0-0125 
552-7 
1931 
The pressure curve for Experiment II., which is reproduced in Diagram II., 
Curve A, shows how regular was the rate of combination throughout the five days 
over which the observations extended. 
These results prove conclusively that with normal electrolytic gas the rate of 
