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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.
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
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 two lead, three bight Turk's head is also a trefoil knot if the ends are joined together. (2,n) alternating torus knots are (2,n) Turk's head knots. [3] ((p,q) = q times around a circle in the interior of the torus, and p times around its axis of rotational symmetry.) Turk's head knots are easy to edit though hard to tie.
Knot board [] on Elbe 1 (ship, 1965). A knot is an intentional complication in cordage [1] which may be practical or decorative, or both. Practical knots are classified by function, including hitches, bends, loop knots, and splices: a hitch fastens a rope to another object; a bend fastens two ends of a rope to each another; a loop knot is any knot creating a loop; and splice denotes any multi ...
The jury mast knot may provide anchor points for securing makeshift stays and shrouds to support a jury mast, although there is differing evidence of the knot's actual historical use. [3] [4] [5] Jury-rigs are not limited to sail-powered boats. Any unpowered watercraft can carry jury sail.
The butterfly bend is a knot used to join the ends of two ropes together. It is the analogous bend form of the butterfly loop , [ 1 ] in that it is the butterfly loop with the loop cut. [ 2 ] The observation that the butterfly loop is secure enough to isolate a worn or damaged section of rope within the loop indicated that the bend form of the ...
Weaver at Queen Street Mill demonstrating a weaver's knot Steps in tying a weaver's knot. The sheet bend may be tied by various methods: the basic "rabbit through the hole" method of forming a half hitch in the bight of the larger rope, by a more expedient method shown in Ashley as ABoK #1431 (similar to the method used by an experienced sailor or mountaineer to tie a bowline) or by a trick ...