164 



A MANTAL OF RWKSTKY 



TABLE SHOWING THIC APPLICATION OF A VOLUME TABLE 

 TO SECURE THE STAND OF SPRUCE ON A WOOD LOT. 



1 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 t re-is 

 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 diffeirnt 

 diameters and lengths. A number of such log rules 1 are in use 

 in different parts of the country. The most common rules 2 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 

 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 g-inch 

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



1 See Woodman's Handbook. Hullrlin 36, U. S. Forest Service. 



2 Copies of these rules are given in the back of the book. 



