Which factor is used in the Doyle Log Scale to estimate log volume?

Which factor is used in the Doyle Log Scale to estimate log volume?

• A. Age.
• B. Height and crown width.
• C. Diameter and length.
• D. Species only.

Answer: (C)

Estimating log volume with the Doyle scale relies on two measurable dimensions that directly influence how much wood is inside a log: the log’s size at the small end and the log’s length. The diameter at the small end provides a practical handle on cross-sectional area, while the length tells you how many units of that cross-section the log contains. Together, they capture the primary factors that determine volume, which is why Doyle’s rule uses these two measurements. The rule is typically applied with a formula that combines small-end diameter and length to give board feet, reflecting how log volume scales with both size and extent. Age, crown width, height, or species alone don’t pin down the log’s volume, since they don’t specify how large the cross-section is or how long the log runs.

Estimating log volume with the Doyle scale relies on two measurable dimensions that directly influence how much wood is inside a log: the log’s size at the small end and the log’s length. The diameter at the small end provides a practical handle on cross-sectional area, while the length tells you how many units of that cross-section the log contains. Together, they capture the primary factors that determine volume, which is why Doyle’s rule uses these two measurements. The rule is typically applied with a formula that combines small-end diameter and length to give board feet, reflecting how log volume scales with both size and extent. Age, crown width, height, or species alone don’t pin down the log’s volume, since they don’t specify how large the cross-section is or how long the log runs.