COKING TESTS. 47 
The conclusion was reached that it was of no practical importance, as 
there are so many other factors in the blast furnace. In view of the 
fact that the gases in the furnace are mixtures of C0 2 , CO, H, 0, N, 
water vapor, and probably others, it appears that action of C0 2 
is of little value unless the action of these other gases, either inde- 
pendently or in connection with C0 2 , is known. An investigation of 
the action of C0 3 on red-hot coke, as a means of making comparison 
of hardness, is being made and gives evidence of yielding some positive 
results, but work along this line has not progressed far enough to 
draw any definite conclusions. 
The loss of sulphur from coal to coke by volatilization varies with 
the different coals, depending on several factors, among which, in the 
order of their importance, are the condition in which sulphur exists 
in the coal, the heat of the oven, the rapidity of coking, and watering. 
The sulphur loss ranged from 20.79 per cent on Arkansas No. 1 (test 
95) to 63.07 per cent on Illinois No. 29 (test 170), the average for all 
tests being 43.27 per cent. 
