Bight (knot)

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An open loop (ABoK #31) of rope, narrower than a bight.

In knot tying, a bight is a curved section or slack part between the two ends of a rope, string, or yarn.[1] "Any section of line that is bent into a U-shape is a bight."[2] An open loop is a curve in a rope narrower than a bight but with separated ends.[3] The term is also used in a more specific way when describing Turk's head knots, indicating how many repetitions of braiding are made in the circuit of a given knot.[4]

Slipped knot[edit]

Not to be confused with slip knot.

In order to make a slipped knot (also slipped loop and quick release knot), a bight must be passed, rather than the end. This slipped form of the knot is more easily untied. The traditional bow knot used for tying shoelaces is simply a reef knot with the final overhand knot made with two bights instead of the ends. Similarly, a slippery hitch is a slipped clove hitch.[citation needed]

In the bight[edit]

The phrase in the bight (or on a bight) means a bight of line is itself being used to make a knot. Specifically this means that the knot can be formed without access to the ends of the rope.[5] This can be an important property for knots to be used in situations where the ends of the rope are inaccessible, such as forming a fixed loop in the middle of a long climbing rope.[citation needed]

Many knots normally tied with an end also have a form which is tied in the bight (for example, the bowline and the bowline on a bight). In other cases, a knot being tied in the bight is a matter of the method of tying rather than a difference in the completed form of the knot. For example, the clove hitch can be made "in the bight" if it is being slipped over the end of a post but not if being cast onto a closed ring, which requires access to an end of the rope. Other knots, such as the overhand knot, cannot be tied in the bight without changing their final form.[citation needed]

Examples[edit]

Bight Examples
Sheet Bend
The blue rope (right) is half-hitched through and around a bight of the red rope (left) in this Sheet bend
Slipped Buntline Hitch
The final tuck of this Slipped buntline hitch is made with a bight rather than the end, making it easier to release after tightening. 
Marlinespike Hitch
In the tying of a marlinespike hitch, a bight of the standing part is snagged through the loop. 
Turk's Head 3 Lead 10 Bight Doubled
The bights, in the case of this 3-lead 10-bight Turk's head knot, are the scallops along the perimeter of the knot. 
Alpine Butterfly Loop
The Alpine butterfly knot is a climbing knot which is tied in the bight and forms a reliable fixed loop. 
Bowline on a Bight
The Bowline on a bight forms two fixed loops in the middle of a rope. 
Overhand Loop
An Overhand knot tied in the bight results in an Overhand loop
Figure Eight Loop
A figure-eight knot tied in the bight results in a figure-eight loop

References[edit]

  1. ^ Ashley, Clifford W. (1944). The Ashley Book of Knots. New York: Doubleday, 1944, p597. ISBN 9780385040259.
  2. ^ Budworth, Geoffrey (2002). The Illustrated Encyclopedia of Knots, p.18. ISBN 9781585746262.
  3. ^ Ashley (1944), p13.
  4. ^ Ashley (1944), p232.
  5. ^ Ashley (1944), 207.

Bibliography[edit]

  • Ashley, Clifford W. (1944). The Ashley Book of Knots. New York: Doubleday, 1944. ISBN 9780385040259.
  • Budworth, Geoffrey (2002). The Illustrated Encyclopedia of Knots. ISBN 9781585746262.

External links[edit]