. Lumber recovery from dead ponderosa pine in the Colorado Front Range. 0 -\ 1 1 1 1 1 1 1 1 1 1 r r 0 4 8 12 16 20 24 Diameter (inches) Figure 3—Estimated lumber recovery factor based on gross cubic volume, along with the data scatter, is shown for all logs combined. The relation of lumber recovery factor to log diameter is very similar to the relation of CR% of surfaced-dry lumber to log diameter. Equations and statistics are given in table 3. 400 -i 350 - 300 -. + + + SO + ? ? + + + 0 _| ! ,—: , , , , { { f ] ^ ( 0 4 8 12 16 20 24 Diameter (inches) Figure 4—Overrun, based on net Scribner sc
. Lumber recovery from dead ponderosa pine in the Colorado Front Range. 0 -\ 1 1 1 1 1 1 1 1 1 1 r r 0 4 8 12 16 20 24 Diameter (inches) Figure 3—Estimated lumber recovery factor based on gross cubic volume, along with the data scatter, is shown for all logs combined. The relation of lumber recovery factor to log diameter is very similar to the relation of CR% of surfaced-dry lumber to log diameter. Equations and statistics are given in table 3. 400 -i 350 - 300 -. + + + SO + ? ? + + + 0 _| ! ,—: , , , , { { f ] ^ ( 0 4 8 12 16 20 24 Diameter (inches) Figure 4—Overrun, based on net Scribner scale, is shown for live logs only. Unlike CR% and LRF, overrun peaks for 7-inch logs because of logs scale and taper and then decreases as log diameter increases. The variation in the data is greatest in the small-diameter logs because of variation in taper rates and manufacturing. Equations and statistics are given in table 3. Overrun—Overrun is the common term used to describe the amount of lumber recov- ered that is in excess of the net log scale; it is expressed as a percentage of the net log scale. Unlike CR% and LRF, overrun peaks for 7-inch logs and then declines (fig. 4). This relation is typical of overrun and is caused by Scribner scale step func- tions and inaccuracies in estimating small-log volumes. Overrun is not shown for the dead classes of timber; the inaccuracy of the Scribner scaling rules when applied to logs from dead trees renders the net scale volume, and hence the overrun, meaning- less. Snellgrove and Cahill (1980) discuss the problem in detail. 9. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Willits, Susan; Woodfin, Richard O; Snellgrove, Thomas A; Pacific Northwest Research Station (Portland, Or. ). [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific No
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