Moisture Content of Some Typical Coals. 



183 



lower temperatures, but with such slow rates that the 

 amount of water formed is not measurable. There is no 

 real break in the curves but a more rapid change in direc- 

 tion due to the appearance in measurable quantities of 

 water of decomposition. 



It is a comparatively easy matter to pick out from 



Fig. 9. 



( | ' "[ -■"" ; ■ " /" ■ ■ ■ ' 





















^ i i 1 ' [~ T | - --"* 









_ __ - .BSaii^TU, V- >&! ^... eL (-- — 4t<' .. . 



fe_ _ 





































, p -i---. 







_j; IDlu Slue,!.— <<I _ H .iLii--r-"5! . .. - 



lp ... *, .. J — --<*----zz--\ 









:_ ■ ■■ " j~ t q — - - 





._ . -,. __.. _. j_ _ _ ._. .. j_.i_ . . 1 __.-.. 



175° 



200° 



225° 250° 



Temperature. 



275° 



300° 



325° 



these curves satisfactory values for the moisture con- 

 tent : — 



Moisture Content, e.e. of Gas per Standard Method 

 Gram of Coal. of Moisture. 



New River 



1-50 



•85 



110 



Pittsburgh 



2-45 



•60 



1-93 



Indiana 



6-82 



■75 



4-55 



Wyoming 



8-20 



200 



615 



The values are over 30% greater than the standard 

 method of determining moisture, which in view of the 

 situation we have pointed out, would hardly be expected 

 to give the true moisture content of a coal, but the stand- 

 ard method is valuable for commercial purposes. 



It is evident from fig. 9 that we may select for our bath 

 liquid any substance which boils between 230° and 275°, 

 and the time of heating may be anything between 1 and 

 2 hours. 



