168 



A MILL SCALE STUDY OF WESTERN YELLOW PINE. 



90 

 8O 



1 7 



_l 

 O 

 > 60 



K 



* 



4O 



U 30 



20 



10 



2O 22 24 26 28 3O 32 34 36 38 

 DIAMETER BREASTHIGH INCHES 



44 



FIG. 212. A diagram showing the yield of lumber and by-products, in per cent of 

 average total yield, from mature western yellow pine trees of different diameters 

 breasthigh. (Values given in Table 38.) 



100 per cent. 



Per cent total sawed out. 



Per cent by-products. 



Per cent high grade lumber. 

 Per cent intermediate grade. 

 Per cent low grade. 



Per cent bark. 



Per cent slabs, breakage and defects. 



Per cent sawdust. 



NOTE. Average total yield = total volume of wood and bark between stump and a 

 height where the tree is 6" outside bark. 



