BOARD MEASURE. 13 
The rules which follow are constructed from diagrams, by math- 
ematical formule, by measurements of logs sawed at the mill, 
or by a combination of these methods. 
Comparison of Log Rules for Board Measure. 
z 
The tabies which follow show the contents of 12, 16, and 20 
foot logs of different diameters as derived from the rules used in 
the United States and Canada. A brief description of the rules 
follows the comparison tables. 
