. Timber measurement problems in the Douglas-fir region of Washington and Oregon. Forests and forestry Washington (State) Mensuration; Forests and forestry Oregon Mensuration. There may be advantages in cumulating them for batches of logs, but these have not been demonstrated. Apparently, no tests have been made in the Northwest of the utility and accuracy of log weight and length as cumulated measures for batches of logs to estimate product recovery. How- ever, the operator of a dimension mill reported that the closest way to estimate lumber yield is to weigh logs. On the basis of 10 loads of
. Timber measurement problems in the Douglas-fir region of Washington and Oregon. Forests and forestry Washington (State) Mensuration; Forests and forestry Oregon Mensuration. There may be advantages in cumulating them for batches of logs, but these have not been demonstrated. Apparently, no tests have been made in the Northwest of the utility and accuracy of log weight and length as cumulated measures for batches of logs to estimate product recovery. How- ever, the operator of a dimension mill reported that the closest way to estimate lumber yield is to weigh logs. On the basis of 10 loads of 30-percent defective Douglas- fir, he found that he got 1 board foot of lumber for each pounds of logs. He used this factor for a year with good results. SOURCES OF TIMBER MEASUREMENT PROBLEMS There are several ways measurement problems can be classified. Consideration of problem source is important because some measurement problems will remain to annoy all concerned, no matter how many changes are made or refinements added to the present systems. Measurement problems typical of old-growth timber will disappear in time. However, others are generated by the way records are kept or sales are made and can be reduced only by changing record keeping or sales procedures, not by ad- justing measurement systems. Figure DEFECTIVE TREES Defect is a major source of problems, particularly in the approximately 500 billion board feet of old-growth timber in the Douglas-fir region. Since high-value old growth will be with us in commercial amounts for 30 to 50 years, any system for measuring timber in the Douglas-fir region must be adapted to good defect estimation. In standing trees, external indi- cators of defect must be used; those high in the tree are hard to see, and many defects have no external indicators. After trees have been bucked, the cut sections give samples of the inside of the tree (Figure 8). Please note that these images are extracted from scanned p
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