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50 THE WOODSMAN’S HANDBOOK. 
the side of the square and the product will be the contents of a 
log 12 feet long. For logs of other lengths multiply by the length 
and divide by 12. 
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The Hanna Rule. 
The Hanna Rule is used in Pennsylvania, Tennessee, Virginia, 
New York, and Massachusetts, and locally elsewhere. It was 
computed from diagrams drawn for every size of log from 8 to 50 
inches in diameter. In constructing these diagrams lines accur- 
ately measured 1 inch apart one way and 1} inches apart the other 
way were drawn crosswise; thus allowing a quarter of an inch to 
each board for saw kerf. Practical millmen were consulted by 
the author of the rule to check the results. 
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The Favorite Rule. 
The Favorite, or Lumberman’s Favorite Rule, is used in Vir- 
ginia, West Virginia, Michigan, New York, Texas, Tennessee, 
Indiana, Pennsylvania, North Carolina, and Missouri. It is based 
upon diagrams drawn for logs of different diameters, the results 
being corrected by sawyer’s tallies. 
The Baxter Rule. 
This rule is used chiefly in Pennsylvania. Itis based upon dia- 
grams, the results being afterwards checked by measurements of 
logs at the mill. 
The Doyle and Baxter Rule. 
This rule is a combination of the Doyle and the Baxter rules. 
The figures for logs 20 inches in diameter and under are from the 
Doyle Rule, and the remainder are from the Baxter Rule. It is 
used in Pennsylvania. 
The Square of Twos-thirds Rule. 
This is also known as the St. Louis Hardwood Rule, the Two-° 
thirds Rule, the Tennessee River Rule, and the Lehigh Rule. It — 
is used in Tennessee, Pennsylvania, North Carolina, Kentucky, 

