i6o 



FORESTRY IN NEW ENGLAND 



From this curve it is possible to make the rough volume table 

 (called a "local" volume table) as follows: 



LOCAL VOLUME TABLE. 



With such a volume table the total contents of the trees on 

 the wood lot of this species are obtained as already explained. 



Still another method of obtaining the volume of the stand 

 without the use of any volume table is based on estimating, 

 at the same time with the breast high diameters, the top diam- 

 eter of every 16-foot log. To do this accurately requires some 

 practice in judging 16-foot lengths and diameters at different 

 distances. As a result of this method the note keeper has not 

 only the diameter of each tree but also the estimated top diam- 

 eter of each log. The volumes of logs of different diameters are 

 given by the log rules, and the total amount of lumber for the 

 tract is obtained by multiplying the volume of the log of each 

 diameter by the number of logs of that diameter, and adding all 

 together. The following table illustrates the final result by this 

 method. 



