PROPOB HON OF CHEMK A I ,S. 
37 
3 parts. The reactions were accomplished in 2-gallon earthenware 
fumigating vessels in a room where the air was moderately quiet. 
The temperature of the gas was taken at the mouth of the vessels. 
Table III. — Experiment to determim tht temperatun oftht gas resulting from largt <n,<l 
sin <il I dosagi s. 
Amount 
of chemicals used 
Time 
Highesl 
tempera- 
ture ol 
mixture 
of acid 
and 
W .H«T. 
after 
mixing 
w hen 
tempera- 
ture of 
Temper- 
ature ol 
mixture 
at <'iiil 
tempera- 
ture ol 
ii\ dro- 
.■\ anlc- 
e ration 
w hen 
tempera- 
ture "i 
1 ••IH|MT- 
ature of 
minute 
from 
minutes 
frnin 
Cyanid. 
\chl. 
\\ iter. 
mixture 
is highest. 
minute. 
genera- 
tion. 
tlon. 
F 
- 
Ounci t. 
Ounces. 
°F. 
Seconds. 
°/\ 
°F. 
Seconds. 
! 
9 
135 
30 
131 
: ■ 
6 
L8 
5 
157 
104 
86 
V 
B 
24 
167 
25 
15 
30 
L06 
111 
10 
70 
25 
M 
30 
10 
L2 
12 
L64 
L57 
,,ii 
L13 
95 
11 
14 
12 
L78 
• '- 
145 
25 
lit'. 
16 
16 
[8 
173 
25 
161 
118 
20 
20 
60 
L72 
25 
168 
L53 
-''"' 
123 
106 
An examination o( this table shows that the temperature of the 
escaping gas increases somewhat as the dosages become larger. 
Hence if heated gas is more injurious than cooler gas, we would ex- 
pect more burning as a result of the increased dosages. This is 
exactly what does happen to some extent in field operations. It is 
interesting to note that the highest temperature of the acid-water 
mixture occurs about one-half minute after the mixing takes place. 
The highest temperature of the hydrocyanic-acid gas occurs about 
one-half minute after the generation commences, and then the tem- 
perature of the gas rapidly decreases during two to two and one-half 
minutes, at the end of which time most of the gas has been evolved. 
At the expiration of from three to five minutes the generation of gas 
has practically ceased. 
THK EFFECT OF DIFFERENT PROPORTION^ Ol WATER ON THE A.Mol NT OF AVAILABLE 
HYDRO* YANK - A< CD GAS. 
In the course of this investigation an experiment was made to deter- 
mine the amount of hydrocyanic-acid gas available when generated 
with different proportions of water. The results as determined by the 
Bureau of Chemistry of this Department are given in the accompa- 
nying chart (fig. 13). 
In these experiments commercial sulphuric acid, G6° Baume or 
92.77 per cent pure, and potassium cyanid 97.12 per cent pure wen 4 
used. Three ounce- (fluid) of sulphuric acid and 3 ounces (avoirdu- 
pois) of potassium cyanid were employed in each experiment, and 
3, 6, 0, 12, 15, 1 v 2 1 . and 2 1 ounces, respeel ively, of water were used 
in the different experiments. 
