age 
Chemical Examination of Bituminous Coal. 371 
’ Three specimens, Nos. 6, 7, and 8, (taken as heretofore ,) of 50 
grains each, were coked in close covered platina crucibles over an 
alcoholic tainp, and then removed to and ignited in a draft fur- 
nace at a white heat. The coke from all these was jet black, 
shining, porous, and soft. 
The carbon being burned off in a platina capsule, the results 
were as follows, reduced to centesimal proportions. 
6 yj 8 | Average. 
‘ ‘ 63.4 | 60.8 | 59.2 61.1 
shes, . ; é 4. 7.1 | 10.4 ro | 
Volatile matter, 32.6 | 32. 30.4 + 3L6 
100. 99.9 /100. 99.8 
\Coke, per cent. 67.4 | 68. 69.6 | 68.2 ~ 
The average of both series is given below. 
First series. [Second series Average. 
Cie, so 55.43 | 61.1 = 1768.26 | 
Ashes, ate 8.25 71 7.67 
Volatile matter, . 35.66 | 31.6 33.62 _ 
99.34 | 99.8 99,55 
Coke, . : ‘ 64.33 | 68.2 66.31 
Two specimens of 100 grains each, were heated in fine pow- 
der to 300°, and sustained a loss of 1.9 grains, and 2.1 grains; 
average loss 2 per cent.; this was moisture, which is of course 
included in the per coatage of “volatile matter.” 
No bitumen or liquid matter was distilled over in the coking 
of No. 1. 
The ashes in every case were very light, and of a clear gray- 
ish white, indicating no pyrites or peroxide of iron, and were in 
no degree attracted by the magnet. 
The ashes of No. 7, being 3.6 grains, were treated with dilute 
nitric acid; 2.4 grains were insoluble residuum, chiefly silica ; and 
the soluble matter was lime and al vase slightly colored by wulda 
of iron and manganese. 
' The analysis of the coal, shows in the general average, (which 
may be regarded as approaching nearly to practical results, where 
the coal is employed in the large way,) proportions of solid carbon 
and volatile matters, which render it well adapted to the most 
important purposes in the arts, and probably, with a low and well 
managed heat, to the production of gas for illumination. Its 
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