FOREST COMMISSIONERS REPORT. 123 



Measure the average diameter of the rot. Add to this figure 

 1-3 of itself if 12 inches or less, and 1-4 if from 13 to 20 inches. 

 Find the scale of a log the size of the resulting figure and 

 length of the whole log, and deduct this from the full scale of 

 the log. For example : If in the log above there is rot appearing 

 in both ends, the largest average diameter of which is 6 inches 

 add 1-3, or 2, to six, making 8. Find the scale of a log 8 inches 

 diameter and 16 feet long — 44 board feet. Deduct 44 from 179 

 and we have for the sound scale of the log 135 board feet. 



Crooks, lightning scars, cat faces, and other forms of de- 

 fects must be deducted according to the proportion of the log 

 affected by them. Allowance should always be made for the 

 slab in deducting for side defects, as much, and sometimes all, 

 of the defect will come out in slabbing and should not be de- 

 ducted from the scale. 



The Maine Rule will underscale long logs. Logs over 24 

 feet in length should be scaled as two, taking one diameter at 

 its middle. The Maine Rule is given below. 



