Usage
Made with suitable rope by trained personnel this knot can be used as a rescue harness capable of supporting a person when they are being lowered to safety. One loop supports the body, around the chest and under the arms, and the other supports the legs, under the knees. Tied towards the middle of a line, one end is used for lowering and the other manned below to control the victim's position with respect to hazards during the descent. A snug fitting of this knot should not allow the person to fall, even if unconscious.
Read more about this topic: Fireman's Chair Knot
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