Skyline logging
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In skyline logging (or skyline yarding), logs are transported on a suspended steel cable from where the trees are felled to a central area, which is typically next to a road. Logs are attached to the suspended cable by means of choker cables and carriages. A skyline yarder can pull in 5 to 10 logs (on separate chokers) at a time. The suspended cable is a loop that wraps around a pulley at each end; one of the pulleys is the drive pulley. The pulleys are mounted on towers or cranes or, in rare cases, helium balloons.