278 



TIMBER MEASURING 



Die Square Measurement. By this method, the contents 

 are computed by multiplying the length of the log by the 

 area of the greatest square that can be obtained out of the 

 section of the log, either at its smallest end or out of its 

 mean section. The contents of the rounded sides are left 

 out of account. 



The contents may be found by the following formula : 

 (Quarter girth in inches) 2 x length in feet 

 181 



The following figure illustrates the method : 



The shaded portion is not included in the measurement, 

 although it exists. 



Board Measure. This is the method in common use 

 in America. The contents are computed according to the 

 estimated number of superficial feet of i-inch boards that 

 can be cut from a log, allowance being made for bark, 

 waste from sawdust, etc. 



For logs not more than 40 feet in length, the following 

 rule 1 holds good : 



Deduct ij inches from the mean diameter in inches 

 at the small end of the log ; square the result and 



multiply by ( = 7854)- 



This gives the sectional area at the small end. 

 Then deduct ^ths and divide by 12 to bring to board 

 measure and multiply by the length of the log in feet. 

 1 British Columbia log scale. 



