Deduction in board feet of lumber is 3 , ^ 12 x 7 r 17. 



15 



Deduction in cubic feet is 3 x 12 x 7 and divide by 10, or 1,8, 



14 



Figure 6« Method of deducting for defect by using 

 diagrams , 



Culling Logs 



The definition of a cull log is largely a local affair which need not 

 be discussed here in detail. Merchantability varies ■with different species 

 with business conditions and other factors « In cubic-foot scaling as in 

 board-foot scaling there should, of course, be merchantability or minimum 

 grade specifications which state that to be merchantable a log must have 

 a minimum length of so many feet, a minimum diameter of so many inches, 

 and not over a stated percentage of cull material. Definitions of merchant 

 ability which now apply to board-foot scaling will in all probability be 

 applicable in cubic-foot scaling. 



The Form of Record 



Each scaler should make a record of the logs he scales. This record should 

 include the essential details for each log, such as the species, diameter, 

 length, amount of defect, and net volume. Listing the log number, gross 

 volume, and kind of defect is optional. The form of record might be some- 

 what like the following: 



_ 20— 



