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Chapter 27 



Table 27-143 — Volume of lumber, kerf, and slabs and edging for various log lengths 

 determined by the Scribner 'A-inch Log Rule (Bennett and Lloyd 1974)' 



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. However, as 

 log length increases, the percentage of log volumes going to slabs increases. 



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

 increased by 20 percent and the kerf estimates reduced by the calculated amounts. 



