28 
Inflammability of ‘“fuma’’ carbon bisulphid in mixture with air. 



« | Carbon bi- 
t O - * 
gonely sulphid “2 
en iter per 1,000 Inflammability. 
Pe air, | Cubic feet 
: of air. 
Grams. Pounds. 
0. 002 0.12 | Not inflammable. 
0. 004 0.25 | Not inflammable. 
0, 008 0.50 | No general combustion; little or no mantle around gas jet plunged into the 
mixture. 
0. 016 1.0 | No general combustion; small blue mantle of burning carbon bisulphid 
formed around gas jet. 
0. 032 2.0 | No general combustion; large blue mantle formed around gas jet and in 
path of products of combustion, 
0, 051 3.18 | No general combustion; large blue mantle formed around gas jet and in 
path of products of combustion. 
0.084 5.24 | Flame traveled slowly to the bottom of the bottle. 
0. 167 10.42 | Very inflammable; scarcely explosive. 
0. 214 13.35 | Very inflammable; distinct explosion. 
0. 238 14.85 | Strong explosion. 
0.356 22.21 | Still stronger explosion. 
0. 468 29.20 | Less strong explosion than next preceding mixture. 
0. 594 37.07 | Less strong explosion than next preceding mixture. 
0. 764 47.67 | Less strong explosion than next preceding mixture, but very inflammable. 


IGNITION TEMPERATURE OF CARBON BISULPHID VAPOR. 
The temperature at which the vapor ignites when mixed with air is given in 
chemical text-books as 300° F. Inasmuch as it is sometimes necessary or desirable 
to use the vapor in rooms in which there are steam pipes or other heating apparatus, it 
seemed desirable to confirm or redetermine its ignition point. In the experiments 
made in the Bureau of Chemistry it was found that the vapor could not be ignited 
at 296.6° F., but twice it took fire at 297.5° F. Of course all higher temperatures 
would ignite it. Chemically pure carbon bisulphid was used for these experiments. 
Mr. C. E. Monroe in an address before the American Chemical Society says: ‘‘One 
of the most striking characteristics of the mixture which this vapor forms with air 
is its low point of ignition. The tiniest spark, a cinder after it has ceased to glow, 
or the striking together of two pieces of iron without sparking are sufficient to 
determine the ignition.’’? In the open air the line of ignition appears to be quite 
close to that of the liquid itself as is stated by some writers and shown in some 
experiments by the author; but Dr. C. V. Riley once stated that the vapor ignites 
‘Sat a great distance from the vessel containing it.’’ Ina closed space the ignition 
depends upon the presence of the vapor in proper proportions and may take place 
at almost any distance from the liquid. This explosive property of the mixture of 
the vapor with air is similar to that of alcohol, petroleum products, etc., though its 
ignition temperature is much lower. The flame extinguishes itself in a closed ves- 
sel which does not allow access to the air. 
0; 
eee 
