Coch-y-Bonddhu, Halford

Parachute Ant
blue-winged olive, BWO (America)  English knot
  A knot commonly used to connect two lines. It is also called Double Overhand Knot. It is a fundamental and excellent knot used to make a knotted leader, or to connect a tippet with a leader. It is a knot used for many years, and there is record of its existence in Britain around 1919.
  Although it is difficult to verbally describe the knot, it is made as follows: turn one line around the other line 4 to 5 times, then return it to the center, perform this to both sides, put the line end through the crevice formed between the two lines at the center, and fasten. When the thickness of two lines is considerably different, bend the thinner line to make a double and just do the Blood Knot. This is called Stu Apte - or Improved Blood Knot. In addition, when one line end is kept long to allow a dropper fly to be attached, it is called Extension Blood Knot.
  Because Blood Knot is a strange name for a knot, the author driven by curiosity investigated, and found a description in a book published in 1944, "The Ashley Book of Knots". It mentioned that this knot was used for the whips used to punish sinners in medieval Britain. It was a whip called cat-o'-nine-tails (cat of nine tails), which had nine short ropes, with the tips of the ropes fashioning this knot to form a ball. When a sinner was struck by this whip, it inflicted wounds like being scratched by a cat. It caused bleeding, and apparently that fact shaped the name of this knot.
Illustration inserted  Four figures on the left of a knot 2
ReferenceThe Ashley book of knots, 1993 (1944). McClane's new standard fishing encyclopedia, 1998 (1965). A dictionary of fly-fishing, 1993 (1992). A fishing knot encyclopedia (in Japanese), 2002 (1999).
knot, knotted leader
Selected Headings

Higanbana (Lycornis radiata: hurricane lily, red spider lily). Sagamihara, Kanagawa Pref., Japan.
Higanbana (Lycornis radiata: hurricane lily, red spider lily). Sagamihara, Kanagawa Pref., Japan.