THE GAS COALS OF OHIO. 729 
feet to the ton of 19 candle gas, then a mixture of three-fourths cannel 
and one-fourth coal will produce, 
1X8= 8 and 8X14=112 
3<9—= 27 and 27X19=513 
4)35 )625(17.86 
8,750 feet of 17.86 candle gas. 
Half cannel and half coal will produce, 8x 14=112 
Y) 1s all7Al 
Q)17 )283(16.65 
8,500 feet of 16.65 candle gas. 
One-fourth cannel and three-fourths coal will produce, 
I< 9s] 0 ancl OK< Issel 
3X 8= 24 and 24 14=336 
4)33 )507 (15.36 
8,250 feet of 15.36 candle gas. 
By the analyses made by Prof. Wormley, as published in the first 
volume of the Ohio Geological Survey, it is clearly shown that but a 
small per cent. of the sulphur in some of the coals analyzed was in 
combination with iron. What the combination really is, I believe is 
unknown. is 
As before stated, analyses show that in some coal nearly all of the 
sulphur passes off in the gas, while with others a very large per cent. 
remains in the coke. It is quite probable that the conditions of the 
analysis have much to do with bringing about these results, and that two 
analyses of the same coal may, in one instance, give coke nearly free 
from sulphur, and the other show most of the sulphur remaining in the 
coke. In the volume just referred to it is stated by analysis, or rather 
by carbonization, Pittsburgh coal is shown to yield 3.50 feet of fourteen 
candle gas per pound of coal, and the Hocking coal is shown to yield 
3.30 feet of eighteen candle gas. 
The fact is, that good Youghiogheny or Pittsburgh coal, yields in 
all large well managed works, 4.75 ft. to 5.25 ft. of 15 to 17.5 candle 
gas to the pound of coal, while by actual tests, as shown in this chapter, 
