8o 



LOGGING 



Fig. 



i6. — Tlu I ndk- C ham Saw u^ed in Bucking-up L< 

 in the Pacific Coast Forests. 



a driving sprocket at the attached end and a blank sprocket at 

 the free end over which the chain travels. The arm is raised and 

 lowered by cables fastened to a light metal derrick which is 

 mounted on the frame of the machine. 



Power for driving the saw is furnished by a twenty- or thirty- 

 five-horse-power, four-cylinder gasoline engine, directly con- 



