Comparing Lumber Yields from Board-Foot and Cubically Scaled Logs.
Forest Service research paper,
FOREST PRODUCTS LAB MADISON WIS
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Historically, sawtimber has been bought and sold by the board foot, but now cubic scaling of logs and timber has begun and is scheduled to entirely replace board-foot scaling by 1985 in sales from National Forests. In board-foot scaling of sawlogs, the contents are estimated by measurement of small-end diameter and log length, and reference to log rule. The actual lumber recovered usually exceeds the estimate by a factor known as overrun. Increasing taper has been shown to increase overrun when logs have been board-foot scaled. The exact opposite occurs when the logs are cubically scaled. Through the medium of mathematical modeling, this study defines the degree of change to be expected from either scaling method as taper is increased. Several examples are developed to explain the use of the tabular and graphic data presented. Author
- Wood, Paper and Related Forestry Products