a 
aa 
456 T. W. E. DAVID AND E. F. PITTMAN. 
Sulphur in coal -686%. Specific gravity 1:362. Ash, reddish 
tinge, flocculent. 
One pound of this coal will convert 13:2 tbs. of water into steam: 
Mean analysis of the six samples :— 
Hygroscopic moisture... Sea 66 
Volatile hydrocarbons ... a, Som 
Fixed carbon ... & soo bd LEO 
Ach ce, 2 ee 10.88 ¢ Coke ot 
100-00 
Mean sulphur °7247/. Mean specific gravity 1°346.. Mean 
calorimetric value 13:0. 
The above analyses prove the coal to be a steam coal of good 
quality, slightly superior to the Bulli coal, but resembling it in 
general physical characters, as might have been expected, seeing 
that it belongs to the same seam. The Bulli coal however, con- 
tains at least two per cent. more ash than that from Cremorne. 
Mr. Mingaye adds that the Cremorne coal forms an excellent 
coke. The mean percentage of ash in the coke would be 13:06. 
General character of the Coke of the Bulli Seam.—The coke 
hitherto made from coal taken from the Bulli Seam contains a 
rather higher percentage of ash than that made from the Northern 
or Newcastle coal, and although at the Bulli Colliery Coke Works 
the coal was passed through a Sheppard Coal Washing Machine 
prior to its introduction to the coke ovens, the percentage of ash 
in the resulting coke amounted to 13:4.* This is said to be due 
to the fact that the dirt.or ash-forming material is intimately 
mixed with or distributed through the Bulli coal in a very fine 
state of division. Nevertheless it appears probable that if the 
washing were preceded by sufficiently fine crushing, a very 
material reduction in the percentage of ash would result. One 
distinct advantage possessed by coke made from the Bulli Seam 
is its capacity for resisting crushing strain, or in other words, its 
* Vide Report on Colonial Coke by EH. F. Pittman, a.x.s.m., Government 
Geologist—Annual Report of the Department of Mines and Agriculture 
for 1892, pp. 35-37. 
