a log rule used in the East and South, particularly for hardwoods; the formula is V = [(D–4)/4]2 L, where V = board foot volume, D = diameter inside bark at the small end in inches, and L = length in feet —note the Doyle rule underestimates board foot volume in small logs and overestimates in large logs —see international quarter-inch rule, log scale, Scribner ruleThis definition last updated 07/17/2008