. Ponderosa pine lumber recovery : young growth in northern California. Ponderosa pine California, Northern. 260 240 220 200 H 180 Z w 5 160 K £ 140 g 120 06 « 100 M > O 80 60 40 20 rn-T i OVERRUN PERCENT = + DIAMETER DIAMETER2 R2 = 10 15 20 LOG DIAMETER 25 Figure 2.—Overrun curve for combined log Grades 4 and 5—703 young-growth ponderosa pine logs. 30 LRF for all sawmills in the United States has been estimated at board feet fUSDA Forest Service 1973a). The gross cubic volume was computed by the following formula: v i 7T L (D? + D. D. + ul) Volume = v 1 12
. Ponderosa pine lumber recovery : young growth in northern California. Ponderosa pine California, Northern. 260 240 220 200 H 180 Z w 5 160 K £ 140 g 120 06 « 100 M > O 80 60 40 20 rn-T i OVERRUN PERCENT = + DIAMETER DIAMETER2 R2 = 10 15 20 LOG DIAMETER 25 Figure 2.—Overrun curve for combined log Grades 4 and 5—703 young-growth ponderosa pine logs. 30 LRF for all sawmills in the United States has been estimated at board feet fUSDA Forest Service 1973a). The gross cubic volume was computed by the following formula: v i 7T L (D? + D. D. + ul) Volume = v 1 12 2 12 x 144 where, it is the constant pi, is average log diameter, large end, D2 is average log scale diameter, small end, and L is log scaling length. By definition 12 board feet of nominal 1-inch lumber is equivalent to 1 cubic foot of lumber. One cubic foot of surfaced dry 4/4-inch lumber, however, is approximately 15 actual board feet per cubic foot of lumber (25/32-inch surfaced board thickness = inch and 12 i = ). The average rough green thickness of lumber produced during this study was 32/32, a full inch. This resulted in board feet lumber tally per cubic foot of lumber produced. For other studies we have conducted, these values have ranged from to board feet per cubic foot. A reduction of 1/32 inch in the rough green thickness for 1-inch lumber should theoretically increase actual 6. 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 Woodfin, Richard O. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ); United States. Forest Service. cn. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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