76 



LOGGING 



saw because the teeth tear rather than cut the fibres, a larger 

 quantity of sawdust is produced, and the rough character of the 

 walls of the cut offers great resistance to the saw. Coniferous 

 wood is more readily sawed than hardwood, because of its simple 

 anatomical structure and fine medullary rays. 



PERFECTION 



PERFECTION NO. 4 



REX FALLING 



/1J1J«WWI«WJ™^'^^^^ 



PEERLESS 



c d 



REDWOOD KING 



EUREKA FALLING 



e e f 



Fig. 14. — Saw Teeth Patterns, a. Often used for sawing yellow pine, cypress 

 and spruce, b. For sawing white pine, hemlock and cedar, c. For sawing 

 poplar and cottonwood. d. For sawing redwood, c. For sawing Douglas fir. 

 /. For sawing white oak. 



Experiments made by Gayer^ show the resistance to the saw 

 across the fibres of green timber to be as follows, the resistance 

 to beech being assumed as i. 



1 Gayer, Karl: Forest Utilization (Vol. V, Schlich's Manual of Forestry; trans, 

 from the German by W. R. Fisher; 2nd ed.). London; Bradbury, Agnew and 

 Company, 1908. 



