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bowline on a bight
The Bowline on a bight is a knot which makes a pair of fixed-size loops in the middle of a rope. Its advantage is that it is reasonably easy to untie after being exposed to a strain. This knot can replace the figure-eight knot when tying into a climbing harness. However, it is critical to use a strong backup knot with plenty of tail beyond the knot.
==Dangers==
2011 testing shows that the knot might slip when only one loop is loaded. Cavers and canyoneers ought to fasten their cow-tail carabiner through both loops.〔http://efs.ffspeleo.fr/techniques/noeuds Video with genuine ''et voilà!'' ending 〕 European cavers widely advocate the use of a figure eight twisted version of the Bowline on a bight.〔:fr:Nœud de chaise double en huit 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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