3346 



Chapter 27 



Table 27-20 — Board-foot volume (International 'A-inch rule) for individual 16-foot logs 

 in trees of mixed hardwood species, form class^ 78 (U.S. Department of Agriculture, 



Forest Service 1965a) 



Dbh 



class 



(inches) 



Position of log in tree 



12 

 14 

 16 



18 

 20 



22 

 24 

 26 

 28 

 30 



'Defined by equation 27-2. 



Table 27-21 — Average upper-log taper for hardwoods (U.S. Department of Agricul- 

 ture, Forest Service 1965a) 



Number of 16-foot logs in tree 

 and log position 



Tree dbh (inches) 



12 to 18 



20- 



Two-log tree 



Second log . 

 Three-log tree 



Second log . 



Third log . . 

 Four-log tree 



Second log . 



Third log . . 



Fourth log . 



2.0 



-Inches ■ 



2.5 



