LOGGING IN THE DOUGLAS FIR REGION. 
105 
main line and a f-inch trip line with a 11 by 13 inch compound- 
geared engine ; and a 1 J-inch main line and a J-inch trip line with a 
scraping engine. 
(c) Cost per foot. — The cost of wire rope per foot varies consider- 
ably, depending on the type of construction, the grade of material 
used, and economic conditions. For selling prices see " Ground yard- 
ing equipment." 
(d) Length of lines. — It is obvious that the cost per thousand 
feet depends on the length of the lines ; that it is larger where long 
lines rather than short ones are used. Main lines used in yarding 
range in length from 900 to 1,500 feet, averaging about 1,200 feet. 
Trip lines are about two and one-half times as long as the main 
yarding lines; straw lines, as long as trip lines. 
(e) Number of lines. — If much of the timber has to be double 
hauled over the ground, the cost of wire rope per thousand feet is 
considerably higher than where it is all single hauled. If some of it 
has to be handled by three or more engines, the effect is to. increase 
further the wire-rope cost. 
(/) Ground conditions. — The lay of the land and the character of 
the soil has a direct bearing on the wire-rope cost. Steep, broken, 
rocky ground is harder on lines than comparatively level land with 
clay for the lines to work on. 
(g) Care of lines. — The cost of wire rope depends to a great extent 
on the care given the lines. More attention is paid to the main yard- 
ing lines than to the others. There are few operators who do not keep 
pretty close track of the main yarding lines. There are not many 
who can tell if the other lines are giving good service, and yet the 
cost of the main yarding lines represents only about one-half of the 
wire-rope cost. All operators do not exercise as much care as pos- 
sible in stringing out the trip lines to the end that friction may be 
reduced to a minimum. Some operators prolong the life of the main 
yarding line through frequent splicing or by turning the line end for 
end on the drum. 
The effect of most of the factors mentioned above is shown by the 
following table and the accompanying discussions: 
Table 18. — Cost of wire rope. 
Camp. 
Time. 
Year. 
Cost per 
thousand 
feet. 
1 
6 months 
1912 
1912 
1912 
1911 
1912 
1912 
1911 
1910 
$0. 072 
2 
1 year 
/ 1 year 
.108 
.197 
3 
\lyear. 
.15 
4 
1 year 
.142 
fl vear. 
.229 
5 .. 
1 1 Vear 
.403 
.495 
