LOGGING IN THE DOUGLAS FIR REGION. 



117 



METHOD. 



The method of high-lead yarding is illustrated by figure 34. A 

 suitable tree coriA^eniently located near the track is used as a spar 

 tree. This tree, with the top cut off at from 120 to 200 feet from the 

 ground, is guyed with from six. to nine lines to give it rigidity. In 

 the case of high spar trees there are usually six guys from the top 

 and three. from a point near the middle. If a double-line system 

 of loading is used, two additional guys„are necessary. A high-lead 

 block, with a sheave from 24 to 36 inches in diameter, is hung near 



3e,''H/Gft LEAD aiocft 



'"^/y^iMeLex rMOws fvc/v** 



Fig. 34. — Location of equipment and improvements in iiigh-lead yarding. 



the top of the spar tree below the guy-line fastenings. The hauling 

 line is passed from the drum of the engine to and through this 

 block, and on and out to the logs to be yarded, the power being 

 furnished by the trip line, as in the case of ground yarding. As a 

 rule, no landings are built ; but, owing to the large output secured, 

 a loading engine in addition to the yarding engine is necessary in 

 all cases. The yarding engine may be set at the base of the tree, or 

 from 150 to 250 feet from it. In some cases the yarding and load- 

 ing engines are mounted on an ordinary flat car or a special steel 

 car with swivel trucks. (See guy-line loading under "Loading.") 



