The Jumar Hoist or Handled Eccentric Cam Ascender is a personal hoist which makes roped ascents and descents much easier to undertake. Jumars do nothing to increase speed; they merely make the climb easier.
The jumar consists of a handle attached to a hook that goes around a rope with a cam to allow the handle to slide one way on the rope but not the other. A climber uses two on a rope, sliding one, then the other, up the rope to ascend. This also works for moving along a cable in Zero-G or microgravity.
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