86 



A MILL SCALE STUDY OF WESTERN YELLOW PINE. 



FOR BUTT LOGS. 



Volume. 



Curves showing average total volume in board feet contained in 16' butt logs 

 from immature western yellow pine trees of different diameters breasthigh. 



1000 



9OO 



800 



700 



600 



50O 



4OO 



300 



200 



100 



18 2O 22 24 26 28 3O 32 34 36 38 4O 42 

 DIAMETER BREASTHIGH INCHES 



FIG. 95. Total volume in board feet as shown by the Spaulding Log Rule. 



