220 
LOGGING 
high as 3000 feet per minute. When the trolley reaches the 
point at which logs are to be secured the drums are stopped and 
the interlocking device freed. When the slack-pulling line is 
wound on its drum it operates the slack puller which runs out 
the slack for the skidding line. The latter is then carried to a log, 
or logs, which are attached to it by tongs or chokers. Logs can 
be drawn in a distance of from 60 to 75 feet on either side of the 
main cable by the attachment of short extensions to the main 
skidding line. When the logs have been pulled in near the main 
cable the short lines are detached and the logs coupled directly 
By permission of the Lidyerwood Mfy. Co. 
Fig. 67. — Method of Shifting the Main Cable from One Run to Another. 
by tongs or chokers to the skidding line, 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 for 
another load. 
Logging rotates around the head spar tree and from 18 to 22 
tail trees are required 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 difficulty 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 sometimes necessary to cut runs 5 or feet wide. 
