What is Scribner scale?
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.
What is a Doyle log scale?
The Doyle scale is the standard by which hardwood lumber is bought and sold. It estimates large or medium logs very close to the actual number but underestimates in smaller logs. Because it comes in below the price, this is the scale most log buyers want to use.
What is the significant of lumber scaling?
Scaling is the term used for the measurement of logs to determine their usable wood content. During the 19th Century and afterwards, mills in most lumbering regions of the United States measured and sold lumber by a price per thousand feet unit measure.
What is the Doyle rule?
The Doyle rule is the most common rule used in hardwood log scaling in Tennessee. Edward Doyle developed this rule prior to 1850. This rule estimates the volume based on log length, diameter, slabs, edgings, shrinkage and production of sawdust.
Whats the difference between Doyle and international scale?
Much of the timber industry operates with the Doyle rule, while some use the International ¼” rule. It is commonly understood that the Int. ¼” rule is the more accurate, in that Doyle underestimates lumber volume, particularly in the smaller-diameter trees. ¼”, the Doyle volume can be multiplied by 1.3.
How much board feet can be used from a tree that is 100 years old?
Tree Volume Estimation
| Table 1. Standing Tree Board Foot Volumes—Doyle Rule | ||
|---|---|---|
| Dbh (inches) | Number of 16-Foot Logs | |
| 20 | 80 | 130 |
| 22 | 100 | 170 |
| 24 | 130 | 220 |
How is Doyle scale measured?
Use the “Log Scale Stick Doyle Rule” with the “Diameter of Log (inches)” to estimate the volume of board feet in logs. Example: A log with an average diameter of 15 inches on the small end (inside bark), and a shortest length of 14’6” would have an estimated volume of 106 board feet (Doyle Rule).
How do you use a Doyle scale?
To use the scale, first measure the average diameter of the small end of the log inside the bark (in inches). Locate that row on the scale. Next, measure the length of the log (in feet). Move over on the scale to that length column.
Which log rule is most accurate?
International 1/4 -inch rule
The International 1/4 -inch rule is the most accurate of the rules discussed; however, it is not as commonly used in Tennessee because of the familiarity with the Doyle rule. The log rule used will vary for different areas within the state.
How big does a tree have to be to log?
How often can you log a woods? What is the best season to sell my timber? How big do my trees need to be before they are cut? The short answer is, anything bigger than 12 inches at chest high can be sawn into boards.