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With the introduction of the nautical mile as a standard unit of measure at sea in the 15th century, they began to mark the line at equal intervals proportional to the nautical mile and to the time interval used for measurement. Initially, the markings were simply knots in the line. Later, sailors worked knotted cords into the log-line.
The eight crossings within the carrick bend allow for many similar-looking knots to be made. The lines in a "full" or "true" carrick bend alternate between over and under at every crossing. There are also two ways the ends can emerge from the knot: diagonally opposed or from the same side. The latter form is also called the double coin knot ...
A Turk's head knot, sometimes known as a sailor's knot, is a decorative knot with a variable number of interwoven strands forming a closed loop. The name refers to a general family of knots, not an individual knot. While this knot is typically made around a cylinder, it can also be formed into a flat, mat-like shape.
A larger form, called the prolong knot, is made by expanding the basic carrick mat by extending, twisting, and overlapping its outer bights, then weaving the free ends through them. This process may be repeated to produce an arbitrarily long mat. [2] In its basic form it is the same as a 3-lead, 4-bight Turk's head knot. [3]
A decorative or ornamental knot (also fancy knot [1]) is an often complex knot exhibiting repeating patterns. A decorative knot is generally a knot that not only has practical use but is also known for its aesthetic or ornamental qualities. [ 2 ]
Knot: Speed: League: Length: Nautical mile: Length: Rhumb: Angle: The angle between two successive points of the thirty-two point compass (11 degrees 15 minutes) (rare) [1] Shackle: Length: Before 1949, 12.5 fathoms; later 15 fathoms. [2] Toise: Length: Toise was also used for measures of area and volume Twenty-foot equivalent unit or TEU: Volume
Three variations of the jury mast knot. A sail-powered boat may carry a limited amount of repair materials, from which some form of jury-rig can be fashioned. Additionally, anything salvageable, such as a spar or spinnaker pole, could be adapted to carry a makeshift sail. Ships typically carried a selection of spare parts such as topmasts ...
Zeppelin bend forming a loop: the four stages of the method starting with a "clover leaf" or flattened overhand knot; Red line: ends of the overhand knot, Green line: ends of the underhand. Another method of remembering this knot is to visualize a "69". To tie the knot with this method, follow the steps below: Make a "6" with one line (rope) end.