Abstract The accurate grading of hardwood logs has been greatly facilitated by the application of standards developed by the Forest Products Laboratory under which the quality of a log is decided by the dear distance between defects rather than by the number and size of the defects. The new log-grading rules are thus consistent with lumber-grading practices. This article presents the basic information and describes the technique necessary for their practical use in the field.
Stone et al. (1944) studied this question.