3° 



LOGGING 



made in different parts of the region, especially in Arkansas, 

 have demonstrated that broadcast burning offers sufficient pro- 

 tection to timber held for a second cut and can be carried on 

 safely provided all slash is removed for a distance of lo feet from 

 the timber that is to be left. The slash can be handled by the 

 swampers and occasionally skidding teams can drag whole tops 

 bodily from the vicinity of trees without decreasing the daily 

 output of the skidding crew. The slash should be burned during 

 calm, damp periods, chiefly in the spring and fall, although it 

 may be done on occasional damp days during the hot summer 

 months. If a virgin forest is to be logged during the summer 

 months when broadcast burning cannot be done safely, the 

 practice should be to fire the ground litter in the early spring 

 and thus provide against ground fires running into the slash 

 during the danger season. The slash should then be burned 

 at the first favorable opportunity. The annual ground fires 

 which succeed the burning of the slash will seldom be sufficiently 

 violent to injure the trees held for the second cut, although 

 reproduction often will be killed. 



SPARK ARRESTERS 



Among the many spark arresters on the market, the following 

 are known to have given the best satisfaction on logging opera- 

 tions: 



Sequoia Spark Arrester} — This arrester (Fig. 2) has a f-inch 

 mesh wire screen {A) which projects above a cinder pan {B) 

 attached to the stack. From the cinder pan outlet pipes (C) 

 lead to a receptacle below. A light metal deflector is fixed 

 inside the pan to guide the cinders to the outlet pipes. The 

 sparks arrested and deflected by the screen are dropped into the 

 receiving pan. This arrester is used chiefly for wood-burning 

 logging engines. Users claim that the engine exhaust will keep 

 the screen clean and that it does not interfere with the draft. 

 The device is fight, and easily put on and removed. The list 

 prices range from $22.50 to $45 each. 



1 Manufactured by the Willamette Iron and Steel Works, Portland, Oregon. 



