176 CONSTRUCTION OF STANDARD VOLUME TABLES 



a curve to show the average height of trees of each diameter (§ 209). 

 The volumes corresponding to these heights in the standard table are 

 taken. When the height for a diameter class falls between the fixed 

 heights given in the table, the volume for this class must be interpolated. 

 For instance, a height of 54 feet in a table showing volumes for 50- 

 and 60-foot trees, would require an addition to the 50-foot volume, 

 of four-tenths of the difference between those of the 50- and 60-foot 

 classes. 



The standard volume table therefore permanently replaces all local 

 tables, provided the average form, the unit of volume, and the merchant- 

 able units used correspond to the conditions for the timber to be meas- 

 ured (§ 205). 



144. Volume Tables for Peeled or Solid-Wood Contents. To 

 obtain volume tables for solid or peeled contents, the original tree 

 volumes are computed from D.I.B. measurements taken at stump and 

 at each section. The D.B.H. of each tree is based on the measurement 

 outside bark just as for volume tables with bark. This permits the 

 comparison of the volumes with and without bark for trees of the same 

 size class. 



References 



Volume Tables and the Bases on Which They May Be Built, Judson F. Clark, 



Forestry Quarterly, Vol. I, 1903, p. 6 (Schiffel's formula). 

 Volume Tables, Henry S. Graves, Forestry Quarterly, Vol. Ill, 1905, p. 227. 



