LOGGING IN THE DOUGLAS FIE EEGION. 
69 
Then, as soon as the last log is on the old road, the chaser unhooks 
the trip line from the main line and sends it back. When it reaches 
the new tail tree the hook tender is there to attach it to the straw line 
and send it in over the new road to the yarder, where it is attached 
to the main line. By the time the crew has moved up to the front 
of the new road the butt chain has arrived, thus enabling them to 
start hauling logs again with practically no loss of time. 
Until quite recently the trip line was run out and changed from 
one road to another by hand, and in some camps this method is still 
Fig. 18. — Logging chance showing location of ground yarding roads. 
used because of the character of the yarding engines. All operators 
that have used a straw line, which should consist of f -inch plow-steel 
cable, are convinced that it is a valuable piece of equipment, espe- 
cially in rough, steep ground. It has been estimated that it increases 
the yarding output from 10 to 15 per cent. 
In addition to the two head trip blocks (fig. 19), which are hung 
to the tail trees by means of straps made from short pieces of cable, 
it may be necessary to reduce wear and tear on the trip line, to use 
two or three other trip-line side blocks (fig. 20), either between the 
