548 



AUXILIARY FOREST INDUSTRIES. 



but more than hardwood. Branchwood and wood in the round 

 yield less than split wood. Thus the yield of charcoal is 

 inversely proportional to the sp. weight of the wood, as 

 heavy wood shrinks more than light wood. The yield by 

 weight is directly proportional to the sp. weight of the 

 wood. 



The average yield from forest kilns may be considered 

 good for broadleaved wood with 50%, and for coniferous wood 

 60%, by volume. The yield by weight is about 25% for all 

 wood. 



Yon Berg,* from average conditions of all intervening 

 factors and after comparing large quantities of wood, gives 

 the following percentages : 



Beschoven t gives the following results of his researches in 

 Eisleben, in percentages : 



5. Assortment. 



Charcoal is classified as soon as it is taken from the kiln, 

 according to the species of wood of which it is made, and 

 also according to the size of the pieces. The smaller pieces 



* " Anleltung 2tmi Yerkolilcn dcs Hol/.cs." 



I (irathc, " Brennmaterialien." 



