112 LOGGING 



in length, when cut by a circular saw which removes a |-inch 

 kerf, will yield approximately the amount of inch-lumber shown 

 by the rule.^ 



It is regarded as a satisfactory rule for short logs. 



The Herring or Beaumont Rule. — ■ This is the rule in common 

 use in Texas. The tables are based on the measurement of logs 

 sawed at the mill. The original rule apphed to logs from 12 

 to 42 inches in diameter and from 10 to 60 feet in length. An 

 extension of the rule down to 6 inches was made a few years ago 

 and the combination is known as the Devant-Herring rule. 



This gives higher values than the Doyle rule for logs 1 5 inches 

 and under in diameter, but gives much lower values for larger 

 logs. It gives results closer to the actual sawing contents of 

 small logs in the shortleaf-pine belt of Texas than does the Doyle 

 rule, since the average logs are less than 15 inches in diameter. 



The Nineteen-inch Standard Ride} — This rule is based on 

 volume measure, the unit being a log 13 feet long and 19 inches 

 in diameter inside the bark at the small end. This is called a 

 "standard" or "market." The formula for determining the 

 volume is 



in which V equals the volume, D the diameter inside the bark at 

 the small end and L the length in feet. 



Standards are not convertible into board feet by any common 

 factor since the smaller the log, the greater the number of 

 standards required to equal 1000 board feet. A converting 

 factor of 200 feet per standard is often used, but it gives inaccu- 

 rate results since it requires from 4 to 14 standards to yield 

 1000 board feet, depending on the diameter and length of the 

 sticks. 



The ratio between cords and standards is fairly constant for 

 logs of equal length. In the Adirondacks 2.9 standards are 

 considered equal to a cord. 



1 See Manual for Northern Woodsmen, by Austin Gary, p. 135. Harvard 

 University, Cambridge, Massachusetts, 190Q. 



2 A copy of this rule is given in the Appendix. 



