Tying
a Reef Knot : Animated Knots

Holding one end of each rope in each hand, pass the left rope
over the right, and tuck under. Then pass the same rope, now in the
right hand, over the left rope, and tuck under.
It is common to chant "Left over Right and Under, Right over
Left and Under" when tying the knot. (This can also be
performed as "Right over Left and Under, Left over Right and
Under".)
The reef knot can easliy be undone by gripping one loose end, and
pulling it back over the knot, in the opposite direction, thus
straightening the rope which is pulled. The other rope forms a Lark's
Head knot, and slips off the tugged rope.
The knot gets its name from its use on sailing ships, when the sails
were "reefed" - rolled up and tied to the cross spar with
a reef knot. To release the sail, the sailors would climb the
rigging, and work their way along the cross spar, pulling the top
end of the reef knot down. They only had to use one hand, holding on
with the other. The weight of the sail would cause the reef knot to
slip, and the sail would be released.
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