## What is the International 1/4 log rule?

International 1/4 – inch Log Rule The rule assumes a taper of 1/2 inch in 4 feet. All calculated values are rounded to the nearest 5 board feet. This rule is generally used in timber sales in eastern national forests and state forests in Tennessee. This is the most accurate rule of the three discussed.

What is the international log scale?

The International scale was originally developed by John C. Clark in 1906 as the 1/8” rule. In 1917 he developed the 1/4” rule, which is the formula used today. This International scale is based on a mathematical formula that accounts for log tapering and a 1/4″ blade kerf.

### What is the Scribner rule?

Board Feet Scribner = (.79D2 -2D -4)L/16. D = Diameter inside bark small end in inches. L = Log length in feet. The rule is fairly consistent on 16 foot or shorter logs under 28 inches in diameter. The Scribner Rule was widely used especially by the Forest Service in the Lake States and the western United States.

How do you scale logs for lumber?

To estimate the board feet from a log, measure the average diameter of the smaller part of the log in inches. Then, measure the length of the log in feet. Move the scale’s marker over to where these two measurements meet. Where the two measurements intersect is the approximate board foot output.

#### How many board feet are in a 1×4?

334
How to Calculate Board Feet

Lumber Dimension Board Foot Measurement
1×4 .334
2×4 .667
1×6 .5
2×6 1

How do you calculate board feed?

Board footage is calculated by multiplying the nominal thickness in inches (T) by the nominal width in inches (W) by the actual length in feet (L) and dividing by 12. The formula is: T x W x L = Board ft.

## How do you read a log scale stick?

Read the scale stick directly from the end of the log, not obliquely from the side. → The diameter of a log is always measured inside the bark. This measurement is called “diameter inside of bark” or d.i.b. Use a log scale stick to measure the d.i.b. at the small end of the log.

How is Scribner calculated?

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

DIB Log Small End in Inches inch
Diameter Measured Inside Bark = DIB
Results:
Board Feet: bf

### What is the Doyle log scale?

The Doyle Log Scale allows you to estimate how much lumber a log will provide. The Doyle Log Scale Ruler is a mechanical device used by individuals who are cutting lumber. The ruler is used to measure both the diameter and the height of the log being cut.

How do you read a lumber rule?

Essentially, a board foot is any combination of length, width, and thickness that equals 144 cubic inches of rough lumber. Another way to express this is: Length x Width x Height (or thickness)/144=Board Feet. This formula will be the foundation for creating the scales on our lumber rule.

#### What are three purposes log scaling?

The log scaler must be within + or – 1% of the gross scale and + or – 2% of the net scale to keep their certification to scale. The scale is used for payment, quality control and inventory purposes.