Four Varieties of CoaL 359 



forge. It will also answer perfectly well for the parlor 

 fire and for steam engines of every kind. It is generally, 

 like the specimen before me^ free from sulphur. It will 

 be especially valuable for the above uses. 





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COAL FROM FROSTBERG, Md. 



\ . 



No. 3. This is a very beautiful, brilhant and glossy 

 jet black coal, of a columnar structure, and breaks into 

 sharp, splintery or square fragments. It contains a few 

 vegetable fibres, or mineral charcoal- It Is a perfectly 

 clean coal, free from dust, and does not soil the fingers. 

 It burns with a clear yellow flame^ without smoke, and 

 swells into a spongy coke, very light and brilliant.- It 



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gives out coal gas when distilled, but not so readily, nor 

 in so great abundance, as the former varieties. 



Specific gravity = 1.321. 



One hundred grains of this coal yield 



1 



Coke 83.5 The coke yields on analysis 



I 



Bitumen and gas 16.5 Carbon 77.9 



Alumina. & ox* iron a trace 3.6 



100.0 SUica 2.0 



( 



^ 



\ 



^.5 



Composition of this coal. 



Carbon 77.9 



Bitumen , 1^-5 . ' 



Alumina and ox. iron 3.6 



Silica - 2.0 



100.0 



This coal is of an excellent quality for parlor fires, 

 furnaces^ forges, steam engines, and for the manufacture 

 of coke. It will not be economical for the manufacture 

 of coal gas. When burnt, it will leave a white ashes 

 remaining, after combustion, in the grate. I should prefer 

 it, for domestic use, to any coal I have ever seen. 



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