154 
BULLETIN 711, U. S. DEPARTMENT OE AGRICULTURE. 
Hypothetical statement showing the effect of output on the operating labor cost 
per thousand feet for roading. 
Labor 
Volume 
Roading 
cort per 
of aver- 
output 
thou- 
age log. 
per day. 
sand 
feet. 
Feet. 
Feet. 
2,000 
ISO, 000 
SO. 11 
1,750 
155,000 
.13 
1,500 
115,000 
.15 
1,250 
125,000 
.16 
1,000 
110,000 
.18 
750 
90,000 
.22 
The labor cost per 1,000 feet would have been twice as high if it 
had been based on the output- of one yarding engine instead of two. 
The same thing would have happened if the cost had been based on 
the use of two roading engines instead of one. If the cost had been 
based on the assumption that two roading engines, working tandem, 
would handle the output of one yarding engine, it would have been 
four times as high. 
Wire rope. — The cost of wire rope per 1,000 feet is rather heavy, 
nearly equaling in some cases the operating labor cost. An average 
cost would serve no practical purpose. From the standpoint of a 
timber appraisal, it is safe to figure that the hauling line will handle 
10,000,000 feet ; the trip line, 15,000,000 feet. The lines used vary 
somewhat in diameter. As a rule, however, the main or hauling line 
is made of 1^-inch rope ; the trip line of five-eighths inch. 
Maintenance and depreciation of roading engines. — Roading en- 
gines are not subject to so much strain as ground yarding engines. 
And as they are of the simple-geared type, they are not so compli- 
cated in make-up. This results in a lower maintenance cost. It also 
tends to give roading engines a little longer life than the compound- 
geared yarding engines. The maintenance cost of logging engines, 
also the amount that should be written off annually for depreciation, 
is discussed under " Ground yarding." 
Improvements. — The cost of pole roads per thousand feet ranges 
from 20 to 50 cents, the amount in a specific case depending on the 
total cost of the road and the volume of timber hauled over it. 
Other costs. — The cost of fuel, blocks, hooks, rollers, lubricants, 
waste, and packing for roading is practically the same as for ground 
yarding. 
LOADING. 
METHODS. 
A number of methods are used in loading logs on railroad cars or 
trucks. Here, as in other departments of the logging operation, 
personal ideas of operators conflict to some extent. A method that 
satisfies one superintendent under certain conditions might not satisfy 
