10(/) 



Note that observations are 

 continued up a bole until 

 an apex is reached. The 

 remaining fork-boles are 

 measured in the sequence 

 of a push -down list --last 

 on is first off. The char- 

 acters in parentheses rep- 

 resent the characters to 

 be entered in column 72 of 

 dendrometer cards. 



Figure 2. --Sequence of measurements for forked trees. 



If merchantable top specifications include bark and the volume is specified to 

 be inside bark, then the bark thickness should be measured or estimated. If bark 

 thickness is to be estimated by an equation, the calculation can be done in a user- 

 supplied subroutine, BARKEQ, described later in this paper. The intervals between the 

 diameter measurements are arbitrary. However, diameters at abrupt changes of taper 

 should be recorded because scaling diameters for board feet are interpolated for a 

 position corresponding to the top of each log of nominal length plus trim allowance. 



For Defect Volume (Cubic Feet) 



Defect is recorded from measurements taken on cut sections. As many as three 

 separate areas of defect can be identified on each section. Because it is necessary to 

 associate the cull areas on succeeding sections, these vertically associated measure- 

 ments will be referred to as cull columns. Three measurements are used to describe the 

 cross section of each cull column. The first two are dimensions, and the third is a 

 letter describing the shape of the cross section. This latter information is the key 

 to how the dimensions are combined to compute the cross-sectional area of the cull 



5 



