42 BULLETIN 139, U. S. DEPARTMENT OF AGRICULTURE. 



To construct a volume table from the upper diameters or tapers given 

 in Table 25, the average top diameter to which trees are utilized must 

 be known. In species possessing a regular form this may be a fixed 

 limit, as 6 inches, regardless of the size of the tree. But where 

 utilization is not close, and tops are hea-vy, with large limbs, the di- 

 ameter limit in the top will increase with the diameter of the tree. 

 With this top diameter determined, the taper table will indicate the 

 merchantable length for each diameter and height class to the near- 

 est 8-foot length. For board feet-, adapting a 16-foot log, the up- 

 per diameters of each log in the tree enable one to secure the scaled 

 contents by the desired log rule. 



The number of standard railroad ties or products of other known 

 dimensions may also be found for trees of any size from this table. 



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