CALORIFIC VALUE OF PHILIPPINE COALS. 



179 



bituminous and subbituminous coals and are applicable only to coals 

 of that class. They are as follows: 



When the percentage 



of volatile combustible 



as compared with 



total combustible 



matter is equal to — 



25 



Then a is 

 equal to — 



102 



27.5 



97 



30 



92 



32.5 



87 



35 



82 



37.5 



77 



40 



72 



42.5 



67 



45 



63 



47.5 



59 



50 



58 



52.5 





55 



56 



Australian coal is strictly of the class of the American bituminous 

 coal and the use of the formula with the values of a as given above 

 is applicable to it, as is shown by the following table where the deter- 

 mined and calciilated results are tabulated side by side : 



Table 1.=^ 



No. 



Source. 



Water. 



Vola- 

 tile 

 com- 

 busti- 

 ble. 



Fixed 

 carbon. 



A.sh. 



Total 

 sul- 

 phur. 



100 V. C. 



Calories. 



Calor- 

 imeter. 



Calcu- 

 lated. 



V.C.-l-F. 

 C, 



1 



AVestwaldsend (1905) „ 



2.59 



32. 85 



52.97 



11.59 





38.3 



6,637 



6,775 



2 



Westwaldsend (1906) „ 



2.60 



34.84 



52.57 



9.99 



0.01 



39.9 



6,976 



6,825 



3 



do 



2.44 



34.77 



45.18 



11.61 



0.61 



43.6 



6,128 

 6,614 



6,000 

 6,600 



4 



Westwaldsend (1907) __ 



2.80 



34.23 



60.94 



12; 03 



0.09 



40.2 



5 



Westwaldsend (1908)-- 



1.74 



36.64 



52.43 



9.19 



0.15 



41.1 



6,983 



6,875 



6 



Westwaldsend (1907) >■ _ 



2,56 



32.97 



51.68 



12.79 



0.12 



38.9 



6,472 



6,650 



7 



Westwaldsend (1908) „ 



2.80 



31.24 



54.35 



11.61 





36.5 



6,835 



6,920 



8 



New Westwaldsend 

 (1907). 



2.56 



35.28 



52.46 



9,70 



0.31 



40.2 



6,906 



6,825 



9 



lUawarra near Sydncy. 



1.26 



25.26 



63.49 



9.99 





28.5 



7,624 



7,600 



10 



Lichzow Valley (1908) . 



2.11 



32.47 



52.62 



12.80 



0,58 



38.2 



6,987 



6,770 



" Selected lump. *■ Double screened and picked twice. 



We would anticipate that the Goutal formula using the values of a 

 given above, is applicable to Australian coal, since the latter is of tlie 

 same class as the 150 American coals from which the values were 

 calculated. 



I have devised a chart (fig. 1) which is generally applicable to coals of 

 this class, by means of which the same results may be obtained and the 

 formula and laborious process of calculating entirely dispensed with. 



^Analyses made by the official method {Joiini. Am. Chem. Soc. (1899). 21, 

 1116). 



