POWER SKIDDING 20I 



cable the short lines are detached and the logs coupled directly 

 by tongs or chokers to the skidding Hne, which is then wound in, 

 and the log elevated wholly or partially from the ground. This 

 is accomplished by holding the outhaul in a fixed position by a 

 friction brake, until the log is in the position desired. The 

 skidding and outhaul drums are then interlocked and as the 

 skidding line is hauled in, the outhaul rope runs out, and the log 

 is held suspended. On arrival at the railroad the logs are dropped 

 in reach of a loading cable, and the trolley again returned to the 

 woods for another load. 



Logging rotates around the head spar tree and from i8 to 22 

 tail trees are usually employed for each set-up, an area of from 

 25 to 40 acres being logged from one spot. 



When the steel spar skidder is used it is not feasible to log in 

 a complete circle because of the difiEiculty of operating lines on 

 the rear side of the machine. As a rule, an arc of from 275 to 

 300 degrees is covered. 



In order to prevent the fouling of the cables in very brushy 

 regions it is necessary to cut runs 5 or 6 feet wide, extending from 

 the head spar to each tail tree. Such work is usually done a 

 short time in advance of skidding. One man can cut the runs 

 when the brush is of medium size. 



By permission of the Lidgerwood Mfg. Co, 

 Fig. 56. — Method of Shifting the Main Cable from One Run to Another. 



Two main cables are employed. While one is being used, the 

 rigging crew, composed of three men, is at work preparing the 

 new tail tree and placing the extra main cable in position on 



