
ORIGIN AND USE OF THE: LOG RULES. i: 
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The Ropp Rule. 
This rule is used in Iilinois. It is based on the following form- 
ula: Subtract 60 from the square of the diameter of the small end 
of the log inside the bark, multiply the remainder by half the 
length of the log, and point off the right-hand figure. 
The Stillwell Rule. 
This is also known as the Stillwell Vade Mecum Rule, and is 
used in Georgia. It gives the contents, in board feet of square tim- 
ber, which can be obtained from logs of different d:ameters and 
lengths without deduction for saw kert. 
The Baughman Rotary Saw Rule. 
This rule is used in the Middle West. It shows the number of 
board feet which can be sawed from logs by a rotary saw. It is 
based upon diagrams drawn ior logs of different sizes. The table 
thus secured was corrected by the author of the rule from his 
experience in manufacturing lumber. 
The Baughman Band Saw Rule. 
This rule was made up in the same way as the preceding rule, 
except that a smaller allowance was made for saw keri. 
The Saco River Rule. 
This rule is used in Maine. It is based upon tallies kept by the 
surveyor at the mill. It was originally intended for white pine. 
The Ballon Rule. 
The Ballon Rule is used by M. E. Ballon & Son, of Becket, 
Mass., chiefly in measuring small hardwood timber, such as 
basket ash. — 
. The Wilson Rule. 
This rule is used in Massachusetts. It is probably based upon 
diagrams. 
