﻿60 



cox. 



The duplication in the percentages of ash by the two methods shows 

 that the official method of analysis is accurate when used here. The 

 effect of water in varying amounts on the decomposition of the coal 

 when this method is used is shown by the following; numbers: 



Table 10.— PoliUo coal, No. 24. 



Average. 



?vater ' Total 



a ^ d matter 6 "'cent" T ° tal 



>ergratn ™*" e A cem ' volatile Ash. per 



of coal. P ercenl - matter, cent. 



matter. 

 percent. 



5.99 

 5.98 



5.90 

 5.80 



5.i9 



48.53 

 49.69 

 50. 26 

 50. 32 



5.85 



5.S9 



Table 11. — Australia coal, No. 1 (coking). 



0.0 



0.05 

 0.1 

 0.2 

 0.3 



0.4 



38. 60 

 3S. 65 



40.09 



40. 24 



40.70 



41.20 

 40.77 



41.60 



12.44 

 12. 36 



38.62 



40.09 



40. 24 

 40.70 

 40. S9 



41.60 



12.40 

 12.38 



12.38 



12. 33 



12. 33 



These samples represent widely different kinds of coal, but the results 

 show that loosely held water in the coals increases the value of the 

 volatile combustible matter by about one and a half per cent. Nearly 

 all of this increase results from the addition of the first 5 per cent of 

 water. 



The results shown in Tables 6, 7, 8, 9, 10, and 11 give the "foil owing 

 figure when expressed as curves : 



