PHILIPPINE FIREWOOD. 7 



Table III. — •Analyses and calorific determinations of air-dried wood without bark. 



No. 



Common name. 



Moisture, 



Ash. 



Main 

 calories.' 



Available 

 heating 

 value. 



Heating 

 value of 

 combus- 

 tible 

 matter, 

 wood — 

 (water 

 + ash) 

 in main 

 calories." 



Available 



heating 

 value of 

 combus- 

 tible 

 matter, 

 wood — 

 (water 

 + ash). 



Agoho 



Guaya 



Pototan 



Bacauan 



Bacao 



Bacauan tubig 



Catutan 



Tabigue 



Bacauan 



Tambu tambu 



Pagatpat 



Lumbayao 



Bayud 



Bacauan 



Tangal 



Pototan 



Lenggadi 



Average of averages 



Per cent. 

 f 11.68 

 I 11. 39 

 f 13. 12 



13.01 

 13. 26 

 11.22 

 11.37 

 11.03 

 10.94 

 13.21 



13.79 

 13.77 

 13.93 

 13.77 

 13.39 

 12.99 

 12. 99 

 14.27 

 14.27 

 12.84 

 13.08 

 10.71 



11.41 



Per cent. 

 0.61 

 0.62 

 1.31 

 1.39 

 1.46 

 1.44 

 2.23 

 2.29 

 1.81 

 1.74 

 5.75 

 5.57 

 1.28 

 1.29 

 2.80 

 2.05 

 2.12 

 2.72 

 2.71 

 2.62 

 2.65 

 1.44 

 1.46 

 2.41 

 2. 26 

 1.60 



4,193 



Calories. 

 3,795 



4,706 



Calories. 

 4,329 



4,180 

 4,191 

 4,118 

 4,107 

 4,159 



3,833 

 3, 829 

 3,772 

 3,746 



3,781 



4,798 

 4,793 

 4,689 

 4, 682 

 4,699 



4,480 

 4,475 

 4,365 

 4,358 

 4,340 



3,753 

 4,142 



3,366 



3,705 



4,787 



4,368 



4, 005 

 4,066 



3,634 

 3,764 



4,694 

 4, 723 



4,345 



4, 456 



4,162 



3,873 



4,833 



4,578 



4,116 



3,841 



4,831 



4,596 



12.26 



11.97 



1.55 

 1.65 



4,203 

 4,252 

 4,136 

 4,154 

 4, 292 

 4,293 

 4,286 

 4,227 

 4,072 



3,803 

 3,891 

 3,721 

 3,760 

 3, 924 

 3,906 

 3,895 

 3,855 

 3,716 



4,812 

 4,877 

 4,689 

 4,720 

 4,747 

 4,747 

 4,840 

 4,773 

 4,629 



4,432 

 4,542 

 4,284 

 4,328 

 4,399 

 4,378 

 4,466 

 4,421 

 4,296 



12.59 



4,755 



4,418 



" In the usual determination of the calorific value of a fuel in a calorimeter the 

 products are cooled to the ordinary temperature and the result is therefore higher than 

 can ever be realized in ideal practice, where the resulting gases always leave the flues 

 at a temperature above 100°. Since the object of the determination of the calorific 

 value of a fuel is to show its technical worth, I always have calculated the results on 

 Philippine fuels on the assumption that the moisture present and the water formed during 

 the combustion remain as steam at 100°, i. e., I have made a water correction by 

 subtracting 6 calories for each per cent of water. Some mechanical engineers do not 

 make this correction, and therefore obtain a result from 3 to 10 per cent too high, and 

 in order that my results may be comparable in all cases I have decided to give also 

 the uncorrected result under the caption "Main calories." 



■> On account of the very high ash content and the possibility of error in its determina- 

 tion (cf. p. 10), this sample has little comparative value and I have therefore not 

 Included the heating value of the combustible matter in the average. The calculated 

 results for the combustible matter, wood — (water + ash), in main calories and available 

 calories are 4,482 and 4,123, respectively. 



