Jury mast knot

The jury mast knot (or masthead knot) is traditionally used for jury rigging a temporary mast on a sailboat or ship after the original one has been lost. The knot is placed at the top of a new mast with the mast projecting through the center of the knot. The loops of the knot are then used as anchor points for makeshift stays and shrouds. Usually small blocks of wood are affixed to, or a groove cut in, the new mast to prevent the knot from sliding downwards.[1]

Jury mast knot
Three variations of the Jury mast knot
NamesJury mast knot, Masthead knot, Pitcher Knot, Jury masthead
CategoryLoop
RelatedTom fool's knot, Handcuff knot, Bottle sling
Typical useJury rigging a mast, carrying pitchers
ABoK#1167, #1168, #1169, #2563

There is contention among knot researchers whether this supposed rigging knot can work as described. Due to a lack of hard historical evidence there is also uncertainty whether it was ever commonly used for rigging jury masts.[2]

Variations

There are three closely related variations of this knot. They differ based on the type of crossing, overhand or underhand, of the three initial loops and then whether the edges of each loop is positioned over or under the previous one. Although these knots are tied in the bight, for the purposes of description the left side will be considered the standing part. If all the crossings and overlays are reversed, or the right side is taken as the standing part, a mirror image of the knot will result.

#1167

This variation grips the mast best in the absence of other means to prevent the knot from sliding downwards. The pattern of this variation, from the left, is: under-under-under/over-over.

#1168

This variation is the simplest of the three in structure (though not in tying) and lends itself to being reinforced by tying a reef knot with the two free ends. The pattern of this variation, from the left, is: under-over-under/over-over.

#1169

According to Clifford Ashley this is the preferred variation. The pattern of this variation, from the left, is: under-under-under/under-under.

gollark: Possibly, depends what it is, I have lots of free time now and can program python a bit.
gollark: I really wonder who goes around *making* these things.
gollark: This is an actual regex in a Markdown parsing thing I'm trying to use:```^(?:(\*(?=[`\]!"#$%&'()+\-./:;<=>?@\[^_{|}~]))|\*)(?![\*\s])((?:(?:(?!\[.*?\]|`.*?`|<.*?>)(?:[^\*]|[\\s]\*)|\[.*?\]|`.*?`|<.*?>)|(?:(?:(?!\[.*?\]|`.*?`|<.*?>)(?:[^\*]|[\\s]\*)|\[.*?\]|`.*?`|<.*?>)*?(?<!\)\*){2})*?)(?:(?<![`\s\]!"#$%&'()+\-./:;<=>?@\[^_{|}~])\*(?!\*)|(?<=[`\]!"#$%&'()+\-./:;<=>?@\[^_{|}~])\*(?!\*)(?:(?=[`\s\]!"#$%&'()+\-./:;<=>?@\[^_{|}~]|$)))|^_([^\s_])_(?!_)|^_([^\s_<][\s\S]*?[^\s_])_(?!_|[^\s,!"#$%&'()+\-./:;<=>?@\[^_{|}~])|^_([^\s_<][\s\S]*?[^\s])_(?!_|[^\s,!"#$%&'()+\-./:;<=>?@\[^_{|}~])```(it's generated from a slightly less insane one with`punctuation` in place of the big mess of punctuation characters, but *still*)
gollark: You could probably procedurally generate a few of the parameters for it. I can't help much though, I just remembered that these were a thing for drawing curves which existed.
gollark: You might be interested in this? https://en.wikipedia.org/wiki/B%C3%A9zier_curve

References
  1. Clifford W. Ashley, The Ashley Book of Knots (New York: Doubleday, 1944), 212.
  2. Charles Hamel, "Investigations on the Jury Mast Knot" (URLs retrieved 2007-02-22)
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