LIVE CROWN LENGTH (IN PERCENT OF TOTAL TREE HEIGHT) 



Figure 1. - -Relation of ratio of trees having left-hand spiral grain to 

 trees having right-hand spiral grain to live crown length. Only trees 

 with spiral grain ratio of 1:50 or naore severe were included. 



Table 8. - -Distribution of sample poles by period of seasoning and spiral grain class 



Period of 

 seasoning [ 





Grain classification 



1 





Straight 



: Left spiral 



Right 



spiral 



: Moderate 



: Severe : 



Moderate 



: Severe 









Pole numbers - 







Green 



1, 2 



3, 4 



5, 6 



7, 8 



9, 10 



1 year 



11, 12 



13, 14 



15, 16 



17, 18 



19, 20 



2 years 



21, 22 



23, 24 



25, 26 



27, 28 



29, 30 



3 years 



31, 32 



33, 34 



35, 36 



37, 38 



39, 40 



Slope -of -grain classes were as follows: straight grain 1:201+, moderate 

 spiral 1:35-65, and severe spiral 1:6-15. 



