368 
LOGGING 
logs either away from or toward the cars. The landing place 
can be made large enough to store 100,000 board feet of logs, 
so that loading can continue when the yarding equipment is 
temporarily out of commission and the yarding equipment like- 
wise may continue to bring in logs even though loading and hauling 
may not be in progress. 
An overhead loader with a standing line is shown in Fig. 127. 
Two trees or gin-poles from 200 to 800 feet apart serve as supports 
for the standing line which is located so that loading may take 
place from either side of the track. A loading line passes from 
the loading engine up to and through a block on the near spar, 
From Bulletin 711, U. S. Dept. of Agriculture. 
Fig. 126. — An Overhead Loading System used in the Pacific Coast Forests. 
thence to the trolley where it is looped down over sheaves on the 
carriage to support a block in the bight of the line and then 
to the far spar where it is fastened. The trolley is moved back 
and forth by means of trip lines, one of which leads from one 
end of the trolley to a block on the far spar, then back to and through 
a block on the near spar and down to a drum on the loader, A 
similar trip-line is attached to the other end of the trolley and 
passes to and through a block on the near spar and down to a 
drum on the loader. 
The lifting line is operated independently of the trip-line, 
hence the load can be raised or lowered as the trolley travels 
along the standing line. 
