Measures and yields of products and residues 3473 



Table 27-142 — Volumes of lumber, kerf, shrinkage, and slabs and edging for various 

 log lengths as determined by the International 'A-inch Log Rule (Bennett and Lloyd 



1974)' 



Slab-edging/ 

 Diameter 1 ,000 board 



(inches) Lumber Kerf Shrinkage Slab-edging feet 



Bdft Cuft Pet Cuft Pet Cufi Pet Cufi^ Pet Cuft 



8-FOOT LOG 



Note: The percentages of total volume for the various components at each diameter do not total 

 100 because a 3-inch trim allowance was included on all log lengths when calculating slab-edging 

 and kerf volumes but omitted when calculating board foot volumes. The latter also deviate slightly, 

 in some instances, from published values because some coefficients were not rounded at the same 

 points as in the original rule. 



'The component values can be calculated for any desired diameter and log length. 



^When the slab volume is converted to chips by chipping head-rigs, these estimates should be 

 increased by 19 percent and the kerf estimates reduced by the calculated amount. 



