68 BULLETIN 711, U. S. DEPARTMENT OE AGRICULTURE. 
curtailment has the effect of increasing the unit cost of succeeding 
steps in the operation. In the case of a two-side camp the output is 
cut in two during the time the move is being made, so that the unit 
cost of succeeding steps is practically doubled. Extra yarding equip- 
ment also gives the man who looks after the machinery an oppor- 
tunity to examine the idle machinery and see that everything is in 
good running condition, thus adding to the safety of the operation 
and reducing to a minimum the chance of tying up a yarding crew 
because of a breakdown, or, if breakdowns occur, the crew can change 
to a machine already set so as to lose no time in waiting for repairs 
to be made. 
The practice of using an extra yarder in the above-mentioned man- 
ner is not common, and no operator running less than three sides 
would consider it desirable. 
SETTING THE LINES. 
With the boundaries of the yarding chance known and the yarding 
engine placed in position at one end of the landing, the yarding 
crew sets about running out the main and return lines. The first step 
is to locate the first yarding road. If all the timber on the chance is 
felled, and it usually is, the usual practice is to locate the first road, 
which is really not a road but the route the logs will follow to the 
landing, on the side bordering the railroad, succeeding roads follow- 
ing each other right around the chance. These roads radiate in a half 
circle from the center to the border of the chance. Since the roads 
lead directly to the landing, it is not necessary to locate them in ad- 
vance, except in a general way. Figure 18 shows the location of the 
yarding roads. 
After the first road is located the straw line is dragged by hand 
over the road from the yarding engine and passed through a block, 
which is adjusted to a tail tree at the far end of the road. From 
there it is taken 300 feet or more to the right or left, depending on 
the direction the chance is being worked, along the back boundary 
of the chance and through another block, and then on to the yarder. 
At the yarding engine, the end of the straw line which has just been 
dragged in is attached to the trip line and the other end is reeled in 
on the small drum. This drags the trip line out to and through the 
blocks and back over the road to the yarder. The straw line is then 
detached and the end of the main line attached to the trip line by 
means of a clevis. The yarder is now ready for operation. 
In changing from one road to another the method in general is the 
same. Before the crew gets ready to change to a new road the hook 
tender may, with the aid of one of the choker setters and the sniper, 
run out the straw line on the new road and hang the extra head block. 
