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FOREST PRODUCTS 



maining moisture from green wood. The following table 

 shows the per cent of available heat given out by wood burned 

 at different moisture contents: 



3. The character of seasoning. Some woods decay if left in the 

 open before they are thoroughly seasoned. This may hold 

 true of beech, birch and other woods under certain conditions. 



4. The rapidity of burning. When certain woods are burned too 

 rapidly full heat values are not derived. 



The average heating value of dry wood has been determined to be 

 4600 calories per kilogram or 8028 British thermal units per pound. 



The following table 1 shows the relative fuel value of non-resinous 

 woods based upon their specific gravity. 



In respect to resinous woods the fuel values can only be approxi- 

 mated according to the resin content. It is said that the califoric value 



1 From " Fuel Value of Wood," by H. S. Betts and E. Bateman, 1913. U. S. Forest 

 Service. 



