38 



A MILL SCALE STUDY OF WESTERN YELLOW PINE. 



4000 



3500 



18 2O 22 24 26 28 3O 32 34 



DIAMETER BREASTHIGH INCHES 



FIG. 10. Total volume in board feet, as shown by the Spaulding Log Rule. 



5000 



4500 



3500 



3000 



2500 



2000 



1500 



1000 



500 





A r 



18 20 22 24 26 28 3O 32 34 36 38 4O 42 

 DIAMETER BREASTHIGH INCHES 



FIG. 11. Total volume in board feet actually "sawed out" at mill. 



