TIMBER ESTIMATING 



159 



TABLE SHOWING THE APPLICATION OF A VOLUME TABLE 

 TO SECURE THE STAND OF SPRUCE ON A WOOD LOT. 



Volumes taken from volume table by T. S. Woolsey, Jr., made in Grafton, N. H. 



In the case of trees for which no volume tables have been con- 

 structed a table should be made. A rough table that will be 

 fairly accurate for any wood lot can be made by cutting on the 

 tract a number of trees of different diameters of the species in 

 question, only taking care that a good range of diameters from 

 the smallest to the largest is included. After these sample trees 

 are felled they are measured into log lengths, and the logs of 

 each tree scaled by the log rule in general use in the community. 

 A log rule is a table, generally laid out on a measuring stick, which 

 gives the number of feet, board measure, in logs of different 

 diameters and lengths. A number of such log rules ^ are in use 

 in different parts of the country. The most common rules - used 

 in New England are the Doyle, the Scribner, the Bangor or 

 Maine, the Blodgett, and the Vermont. After scaling the logs 

 of a tree their volumes are added to give the volume of the whole 

 tree. The volumes of the various felled sample trees are then 

 plotted on cross-section paper, and a curve is drawn designating 

 the average, as shown below. Of the five trees measured in this 

 case, the 7-inch tree contained 30 board feet; one of the 9-inch 

 trees 40, and the other 60 board feet, etc. 



^ See Woodman's Handbook, Bulletin 36, U. S. Forest Service. 

 2 Copies of these rules are given in the Appendix. 



