. Sugar pine utilization : a 30-year transition. Sugar pine. Q) 0 20 40 60 0 20 40 60 Q_ Diameter (inches) Diameter (inches) Figure 9—Percentage volume by lumber grade groups differs by diameter and log grade. These graphs are based on the original log grade before adjusting for frost cracks. The percentage of Selects and Moulding increases with log diameter and decreases with log grade. The high percentage of Economy lumber in grade 2 logs is because of frost cracks and associated shake, which produces splits in the dried lumber and degrades the lumber from Shop and Moulding to Shop Out and E
. Sugar pine utilization : a 30-year transition. Sugar pine. Q) 0 20 40 60 0 20 40 60 Q_ Diameter (inches) Diameter (inches) Figure 9—Percentage volume by lumber grade groups differs by diameter and log grade. These graphs are based on the original log grade before adjusting for frost cracks. The percentage of Selects and Moulding increases with log diameter and decreases with log grade. The high percentage of Economy lumber in grade 2 logs is because of frost cracks and associated shake, which produces splits in the dried lumber and degrades the lumber from Shop and Moulding to Shop Out and Economy. shown in figure 10 (table 6). An example of the variation around the regression estimate for grade 5 logs is shown in figure 11. The higher log grades also had higher values that increased over diameter. The frost crack logs produced the same anomalies in $/MNLS as they did in the $/MLT analysis, but the modified grading also eliminated the crossing of the estimates for the smaller diameter logs. Comparison Since the study results became available, there has been much discussion about the adequacy of the sample, the accuracy of the grading, the efficiency of the mill, and the interpretation of the results. To address these concerns, we will present the following comparison or contrast of three mill studies with different sample locations, mills, and log- grading conditions. Although all the studies were conducted under different circumstances, the intent of all was the same: to collect enough information on each log in the sample to make a reliable prediction of the volume and value of lumber that can be produced from similar-sized logs for a given log grade. This comparison will include recovery ratio, $/MLT, percentage of volume by lumber grade, and $/MNLS, even though the net Scribner scales are not identical. 13. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectsugarpine
