. Lumber yield and log values of Shasta red fir. Lumber Mensuration; Fir; Abies magnifica. Figure 5. --Relationship of scaled defect percent to log diameter; all log grades combined (Trial Log Grades for Asso- ciated Species). 0 l_. I !-L. I I I I I I I 5 10 15 20 25 30 35 40 45 SO LOG DIAMETER ( INCHES) RESULTS AND DISCUSSION—WEST-SIDE PRACTICE Lumber Recovery Based on Bureau Log Grades and a 40-Foot Maximum Scaling Length Distribution of the 362 logs, as graded and scaled in accordance with west-side practice, is shown in table 5. The log volume, lumber volume, and lumber value of the logs i
. Lumber yield and log values of Shasta red fir. Lumber Mensuration; Fir; Abies magnifica. Figure 5. --Relationship of scaled defect percent to log diameter; all log grades combined (Trial Log Grades for Asso- ciated Species). 0 l_. I !-L. I I I I I I I 5 10 15 20 25 30 35 40 45 SO LOG DIAMETER ( INCHES) RESULTS AND DISCUSSION—WEST-SIDE PRACTICE Lumber Recovery Based on Bureau Log Grades and a 40-Foot Maximum Scaling Length Distribution of the 362 logs, as graded and scaled in accordance with west-side practice, is shown in table 5. The log volume, lumber volume, and lumber value of the logs in each 1-inch diameter interval within each log grade are shown in table 6. This digest of study data not only provides the basis for most subsequent discussion but permits a further analysis of results by those who may be interested. * Lumber Grade Yield by Log Grade - Diamete r Class In order that the influence of log quality and log size on lumber yield may be visualized more readily, the bulk of the logs included in the study has been grouped further into 6-inch diameter intervals. All pertinent log input and lumber output data for each of the 6-inch diameter intervals have been summarized in table 7. Those 6-inch diameter intervals containing less than 10 logs were omitted from the summary table. Although much of the variability that occurs in lumber yield is smoothed by grouping logs into 6-inch diameter intervals, this grouping still provides an accurate generalization of lumber grade yield. To illustrate this fact, the yield of the common lumber grades from grade 2 logs has been plotted by 1-inch diameter intervals in figure 6. Grade yields for the 6-inch diameter intervals of table 7, if plotted at the midpoint of the diameter class on figure 6, will fit the scatter diagrams rather well. Lumber Value as an Index of Lumber Grade Yield Lumber value (expressed in dollars per thousand board feet, lumber tally) provides a convenient index to lumber grade yield and facilit
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