MODIFICATIONS OF THE METHOD 



35 



strips to be cut in the first operation and 50 per cent left for 

 the second operation. This proportion is not a requirement 

 of the strip method. (See Fig. 7.) From 30 to 70 per cent 

 of the area might be cut in the first operation. Owing to 

 the greater difficulties in securing natural reproduction on the 

 strips cut in the second operation, 60 to 70 per cent (roughly 

 two-thirds of the area) ordinarily should be cut over in the 

 first operation. By making the uncut strips only half as wide 

 as those cut this proportion is obtained. There is danger in 

 making the uncut strips too narrow. They must be wide 

 enough to offer protection to the cleared area, to be windfirm 



Uncut Strip 



Uncut Strip 



I Strip 



cut 



Clear 



[<-7 



Uncut Strip 



"f Strip 



Clear 



Strip 



cut 



Clear 



X 



FIG. 7. 



Alternate strip method, where one-third of the area is cut clear in the first 

 cutting. The cut strips are half the width of the uncut strips and equal in width 

 to the height of the timber. 



in storms and be large enough to make the second operation 

 practicable as a logging proposition. In general the strips 

 left should be at least as wide as the height of the 

 timber. 



Some windfall must be anticipated along the edges of the 

 cleared area. This can be minimized by careful selection of 

 the trees to be left on the borders of the strips. The strips 

 cut for most species will range in width from two to four 

 times the height of the stand. 



(B) Progressive Strips. In this method three or more opera- 

 tions are required to remove the timber. Applied in its 

 simplest form strip cuttings are made at short intervals 

 starting at one side of the stand and advancing progressively 

 across to the other side. (See Fig. 8.) 



