LOGGING IN THE DOUGLAS FIR REGION. 



133 



Table 22. — Estimated cost of lines, per thousand feet of timber, toith the over- 

 head skidder. 





1 



s 



1 

 3 



a 

 .g 



o 

 ft 



O 



u 

 1 



Case 1 (900-foot 

 span). 



Case 2 (1,200-foot 

 span). 



Case 3 (1,500-foot 

 . span). 



Type of line. 



i 



-(J 



8 



o 



1 



P<a) 

 o 





Total cost. 



' Cost per il 

 feet. 



PI 



1 



o 



1.H 





Ins. 

 1 



1 

 If 



15 

 10 

 20 

 10 

 20 

 10 

 30 

 3 



$0.50 

 .25 

 .20 

 .11 

 .09 

 .20 

 .50 

 .20 

 .20 

 .50 



Feet. 



1,300 



1,100 



2,100 



1,100 



2,100 



800 



800 



250 



2, 200 



1,300 



$650 

 275 

 420 

 121 

 189 

 160 

 400 

 50 

 440 

 650 



80.043 

 .027 

 .021 

 .012 

 .01 

 .016 

 .014 

 .016 



Fed. 



1,600 



1,400 



2,600 



1,400 



2,600 



800 



800 



250 



2,200 



1,600 



$800 $0 

 350 

 520 

 154 

 234 

 160 

 400 

 50 

 440 .. 

 800 .. 



053 

 035 

 026 

 015 

 012 

 016 

 014 

 016 



Fed. 



1,900 



1,700 



3,200 



1,700 



3,200 



800 



800 



250 



2,200 



1,900 



$950 

 425 

 640 

 187 

 288 

 160 

 400 

 50 

 440 

 950 



$0. 063 



1 skidding line 



1 return line 



.045 

 .032 



1 slack pulling line. . . 



.019 

 .014 



1 tightening line 



Loading guys 



.016 

 .0J4 

 .016 



Guy lines 





1 main cable (extra).. 





Total 











3,355 



.159 





3,908 



187 



4,490 



.2 9 















Both chokers and tongs are used, to attach the logs to the skidding 

 line. In some cases tongs furnish the sole attachment; in others, 

 chokers. Both forms of attachment are sometimes used. Wliere 

 only one tong is used it is attached to a ring on the end of the skid- 

 ding line. Where more than one tong is used they are attached to 

 the butt lines or chains, and the butt lines are attached to a ring on 

 the end of the skidding line. Where chokers are used they are 

 attached directly to the end of the skidding line, no butt chains 

 being used. Sometimes one tong and one or more chokers are used, 

 the tong being attached directly to the end of the skidding line. 



The cost of chokers and butt lines per thousand feet does not 

 amount to as much as in ground yarding (see discussion of rigging, 

 cost under " Ground yarding"), probably ranging from 1 to 3 cents. 



The cost of the replacement and maintenance of blocks, carriage, 

 etc., no one is in a position to discuss confidently. The amount per 

 thousand feet is small, ranging from 1' to 3 cents. 



It is conservative to say that the cost of the fuel used in yarding 

 and loading with this system, when the steam for the skidding and 

 loading engine is supplied by a common boiler, is just about equal to 

 the cost of the fuel used in yarding with a ground system. 



The cost per thousand feet for lubricants, waste, and packing used 

 in skidding and loading with this system ranges from 1 to 2 cents. 

 (See " Ground yarding.") 



The cost of the upkeep of the skidder ranges from $30 to $40 per 

 month. (See discussion of the maintenance cost of ground yarding 

 engines under " Ground yarding.") 



The manufacturers of this machine estimate its efficient life at 

 20 years. It may be that with proper maintenance this figure is not 

 too high. However, it is no doubt too high to be used by a going 

 concern or timber appraisers, at least in most cases. The factor of 



