Cull factors presented here are for the cull that occurred 

 above these theoretical stunip heights except those presented for cull 

 in the stiomps alone. 



Log lengths 



Log lengths were l6 feet plus trim allowance for all cubic- 

 foot computations. For board-foot computations, l6-foot logs were 

 used only for trees up to 20.9 inches d.b.h.; those 21 inches d.b.h. 

 or larger were scaled in 32-foot logs. A minimum of 6 feet was used 

 for the length of the top log. 



Top diameters 



Two different top diameters (diameter inside bark) were 

 employed in all computations: a fixed top and the utilized top. 

 The fixed top diameter was 8 inches for board-foot computations and 

 k inches for cubic-foot computations. The utilized top (fig. l) was 

 that actually cut in the logging operations. When no part of a tree 

 was used, the utilized top was figured as ^0 percent of the d.b.h. 



60 

 D. B H (inches) 



Figure 1, — Average utilized top diameter (inside bark) for trees of 

 different d.b.h. sizes of Sitka spruce, western hemlock, and 

 western redcedar in Southeast Alaska. 



-5- 



