. A method of estimating log weights. Forests and forestry Mensuration. <b vt^GJH-(Fttr; \w\\\^nllIUllHili,,,/ «o \ \ AO For bucking to weight Set Density Index to Weight Limit Instructions: ⢠Read Scaling Length at Diameter 2. For estimating weight â Set Diameter at Scaling Length ⢠Read Weight at Density Index Based On: Trim Allowance of 1 Ft. Taper of 1 Ft. Pacific Northwest Forest & Range Experiment Station Forest Service U. S. Department of Agriculture Portland, Oregon <o '' 70 I so i 3° 10 8 WEIGHT - ^U. Figure 1.âSlide rule for estimating log weights. de
. A method of estimating log weights. Forests and forestry Mensuration. <b vt^GJH-(Fttr; \w\\\^nllIUllHili,,,/ «o \ \ AO For bucking to weight Set Density Index to Weight Limit Instructions: ⢠Read Scaling Length at Diameter 2. For estimating weight â Set Diameter at Scaling Length ⢠Read Weight at Density Index Based On: Trim Allowance of 1 Ft. Taper of 1 Ft. Pacific Northwest Forest & Range Experiment Station Forest Service U. S. Department of Agriculture Portland, Oregon <o '' 70 I so i 3° 10 8 WEIGHT - ^U. Figure 1.âSlide rule for estimating log weights. density index can be obtained from other sources such as individual log weights and measurements or knowledge from previous nearby logging operations. Four or five truckloads or their equivalent in individual logs should generally be sufficient for a reasonably accurate density index. To compute a density index for a truckload of logs, the net log weight and cubic volumes must be determined. Scaled cubic volumes are obtained from the large end diameter outside bark and the scaling length by referring to tables 1 and 2 of Appendix II. A worksheet is given in figure 26 of appendix II to facilitate the determination of density index of a truckload of logs. An aver- age of the density indexes of several truckloads provides the density index for estimating log weights. A moving average can incorporate density changes due to time, depen- dent influences such as seasonal variations, and gradual changes in location. A moving average is constructed by periodically obtaining a new sample for incorporation in the average density index and eliminating the oldest sample. An example of a four-load moving average of density index is shown in figure 2. A worksheet (fig. 27) is provided in Appendix II. Estimating Log Weights Once a density index has been established for a particular location and species, the weights of logs can be estimated from the graphs or tables in 4. Please not
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