Spike's Calculators

J. M. Scribner developed the Scribner log rule in 1846.

The Scribner Rule is called a diagram rule because the original numbers were derived by fitting boards into perfect circles representing the ends of logs.

*The Scribner rule was adapted by the Lufkin Rule Company and published as decimal A, B and C rules.*

A change was made to the basic Scribner rule to make it easier to apply. This new rule the "Scribner Decimal C Rule" is different from the standard Scribner rule in that all volumes are rounded to the nearest 10 board feet.

- the length of the log in measured in feet
- small end diameter of the log measured in inches

- the volume of the log in board feet

- Brereton Log Rule - Imperial Measurements
- Blodgett Foot Rule
- Doyle Log Rule
- Early Log Rule
- International 1/8-inch Log Rule
- International 1/4-inch Log Rule
- International 1/4-inch Log Rule (Grosenbaugh)
- International 1/8-inch and 1/4-inch Log Rules
- Roy Log Rule
- Ontario Log Rule
- Scribner Log Rule
- Scribner Log Rule: Board Foot Volume of a Tree
- Scribner Decimal C
- Comparing Results from Various Board Feet Log Rules