LOADING AND UNLOADING CARS 
371 
which passes from a small drum on tho loading engine, up to and 
through a block on the spar, through a block on the end of 
From Bulletin 711, U.S. Dept. of Agriculture. 
Fig. 129. — A Swinging-boom Loading Device sometimes used with the Lidger- 
wood Overhead Logging System. 
the boom and thence to a stump or ''dead man." By pulling 
in on one line and letting the other run out, the boom may be 
swung to one side or the other. 
