This rule appeared at about the same time as the Doyle log rule and the results of this rule are identical to the Doyle log rule.

1. measure the diameter on the small end of the log in inches
2. subtract 4 inches from the diameter
3. multiply this amount by half of the remainder
4. multiply this result by the length of the log in feet
5. divide the previous amount by 8
6. the result in board feet

Example:

1. the diameter measured at the small end of the log = 24 inches and the log is 20 feet long
2. 24 - 4 = 20
3. 20 * 10 = 200
4. 200 * 20 = 4000
5. 4000 ÷ 8 = 500
6. 500 board feet

Calculation

1. enter the small end diameter of the log
2. the length of the log in feet

Result

1. the volume of the log in board feet