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Reef Knot
The reef knot, or square knot, is an ancient and simple binding knot used to secure a rope or line around an object. It is sometimes also referred to as a Hercules knot. The knot is formed by tying a left-handed overhand knot between two ends, instead of around one end, and then a right-handed overhand knot via the same procedure, or vice versa. A common mnemonic for this procedure is "right over left; left over right", which is often appended with the rhyming suffix "... makes a knot both tidy and tight". Two consecutive overhands tied as described above of the same handedness will make a granny knot. The working ends of the reef knot must emerge both at the top or both at the bottom, otherwise a thief knot results. The reef knot is not recommended for tying two ropes together, because of the potential instability of the knot when not stabilized; something that has resulted in many deaths (see Misuse as a bend). Naming The reef knot is at least 4,000 years old. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thief Knot
The thief's knot resembles the reef knot (square knot) except that the free, or bitter ends are on opposite sides. It is said that sailors would secure their belongings in a ditty bag using the thief knot, often with the ends hidden. If another sailor went through the bag, the odds were high the thief would tie the bag back using the more common reef knot, revealing the tampering, hence the name. It is difficult to tie by mistake, unlike the granny knot, unless one attempts to tie a square knot in a similar manner to a sheet bend (which is the correct way to tie a thief knot), then it is possible to tie accidentally. The thief knot is much less secure than the already insecure reef knot. It unties itself if the lines are pulled when the same action would seize a reef knot. (knot number 1207) Tying Related knots See also * List of binding knots *List of knots This list of knots includes many alternative names for common knots and lashings. Knot names have evolved ove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reefing
Reefing reduces the area of a sail, usually by folding or rolling one edge of the canvas in on itself and attaching the unused portion to a spar or a stay, as the primary measure to preserve a sailing vessel's stability in strong winds. Restoring full sail area is termed ''shaking out'' a reef. Whereas fore-and-aft rigged vessels store the unused portion of the sail on a boom, below the sail, square-rigged vessels stow the unused portion on a spar, above the sail. Reefing may occur by rolling the sail around its luff or foot, either on a rotating stay or within a spar. Fore-and-aft rigs Sails may have built-in alternative attachment points that allow their area to be reduced. In a mainsail, pairs of grommets, called reefing tacks, reefing clews, or reefing cringles may be installed in the sail; a cruising boat will typically have two to three pairs. Pulling these points down to the boom forms a new tack and clew, reducing the sail's area. Using the pair of grommets closest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Greece
Ancient Greece ( el, Ἑλλάς, Hellás) was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity ( AD 600), that comprised a loose collection of culturally and linguistically related city-states and other territories. Most of these regions were officially unified only once, for 13 years, under Alexander the Great's empire from 336 to 323 BC (though this excludes a number of Greek city-states free from Alexander's jurisdiction in the western Mediterranean, around the Black Sea, Cyprus, and Cyrenaica). In Western history, the era of classical antiquity was immediately followed by the Early Middle Ages and the Byzantine period. Roughly three centuries after the Late Bronze Age collapse of Mycenaean Greece, Greek urban poleis began to form in the 8th century BC, ushering in the Archaic period and the colonization of the Mediterranean Basin. This was followed by the age of Cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bandage
A bandage is a piece of material used either to support a medical device such as a dressing or splint, or on its own to provide support to or to restrict the movement of a part of the body. When used with a dressing, the dressing is applied directly on a wound, and a bandage used to hold the dressing in place. Other bandages are used without dressings, such as elastic bandages that are used to reduce swelling or provide support to a sprained ankle. Tight bandages can be used to slow blood flow to an extremity, such as when a leg or arm is bleeding heavily. Bandages are available in a wide range of types, from generic cloth strips to specialized shaped bandages designed for a specific limb or part of the body. Bandages can often be improvised as the situation demands, using clothing, blankets or other material. In American English, the word ''bandage'' is often used to indicate a small gauze dressing attached to an adhesive bandage. Types Gauze bandage (common gauze roller ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Furl (sailing)
Furling refers to stowing or dousing a boat's sail by flaking (folding), packing (like stuffing a spinnaker into a bag), or stowing it in part or whole using roller furling Roller furling is a method of furling (i.e. reefing) a yacht's staysail by rolling the sail around a stay. Roller furling is typically used for foresails such as jibs or genoas. A mainsail may also be furled by a similar system, whereby the s .... Furling is not synonymous with ''dousing'' (dropping) or reefing (reducing the exposed area of) a sail, but modern technologies such as roller furling are altering the term's traditional use. Sailing rigs and rigging {{Water-transport-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reefing
Reefing reduces the area of a sail, usually by folding or rolling one edge of the canvas in on itself and attaching the unused portion to a spar or a stay, as the primary measure to preserve a sailing vessel's stability in strong winds. Restoring full sail area is termed ''shaking out'' a reef. Whereas fore-and-aft rigged vessels store the unused portion of the sail on a boom, below the sail, square-rigged vessels stow the unused portion on a spar, above the sail. Reefing may occur by rolling the sail around its luff or foot, either on a rotating stay or within a spar. Fore-and-aft rigs Sails may have built-in alternative attachment points that allow their area to be reduced. In a mainsail, pairs of grommets, called reefing tacks, reefing clews, or reefing cringles may be installed in the sail; a cruising boat will typically have two to three pairs. Pulling these points down to the boom forms a new tack and clew, reducing the sail's area. Using the pair of grommets closest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Friendship Knot
The friendship knot is a decorative knot which is used to tie neckerchieves, lanyards and in Chinese knotting. History and use This is one of the eleven basic knots of traditional Chinese knotting, a craft which began in the Tang and Song Dynasty (960–1279 AD) in China. The Chinese and Japanese names for this knot are based on the shape of the ideogram for the number ten, which is in the shape of a cross that appears on one face (and a square on the other face). ''The Ashley Book of Knots'', first published in 1944, says: "A decorative Chinese Loop. This is commonly employed as a Lanyard Knot. It is handsome and secure." In recent years, it has become popular with members of the Scout and Guide movements for tying their neckerchieves instead of using a woggle. A more complicated version of this knot with a loop on either side is called a winged cross knot in Chinese knotting and macramé Macramé is a form of textile produced using knotting (rather than weaving or knitting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Square Knot (mathematics)
In knot theory, the square knot is a composite knot obtained by taking the connected sum of a trefoil knot with its reflection. It is closely related to the granny knot, which is also a connected sum of two trefoils. Because the trefoil knot is the simplest nontrivial knot, the square knot and the granny knot are the simplest of all composite knots. The square knot is the mathematical version of the common reef knot. Construction The square knot can be constructed from two trefoil knots, one of which must be left-handed and the other right-handed. Each of the two knots is cut, and then the loose ends are joined together pairwise. The resulting connected sum is the square knot. It is important that the original trefoil knots be mirror images of one another. If two identical trefoil knots are used instead, the result is a granny knot. Properties The square knot is amphichiral, meaning that it is indistinguishable from its own mirror image. The crossing number of a sq ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slip Knot
The slip knot is a stopper knot which is easily undone by pulling the tail ( working end). The slip knot is related to the running knot, which will release when the standing end is pulled. Both knots are identical and are composed of a slipped overhand knot, where a bight allows the knot to be released by pulling on an end; the working end for a slip knot, and the standing end for a running knot. The slip knot is used as a starting point for crochet and knitting. Standard creation The slip knot is formed by first creating a loop in the shape of a "p". Place a hand or hook through the loophole and grab a bight on the working end. Draw this bight through the first loop. Seat the knot and pull the bight until a small loop is created. See also * Knot * List of knots This list of knots includes many alternative names for common knots and lashings. Knot names have evolved over time, and there are many conflicting or confusing naming issues. The overhand knot, for example, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shoelace Knot
The shoelace knot, or bow knot, is commonly used for tying shoelaces and bow ties. The shoelace knot is a doubly slipped reef knot formed by joining the ends of whatever is being tied with a half hitch, folding each of the exposed ends into a loop ( bight) and joining the loops with a second half hitch. The size of the loops and the length of the exposed ends are adjusted when the knot is tied. It has the stability of the reef knot but is significantly easier to untie, simply by pulling the ends away from the center of the knot. The loops are sometimes referred to as "bunny ears", especially when the knot is taught to children. Techniques There are several ways to tie a shoelace knot; each starts with the tying of a half hitch, and requires attention or some habitual mechanism for arriving at a knot that is an elaboration of the reef (or square) knot rather than of the granny (or lubber's) knot. If the bow is horizontal across the opening the bow is correctly and securely ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard Henry Dana Jr
Richard Henry Dana Jr. (August 1, 1815 – January 6, 1882) was an American lawyer and politician from Massachusetts, a descendant of a colonial family, who gained renown as the author of the classic American memoir ''Two Years Before the Mast''. Both as a writer and as a lawyer, he was a champion of the downtrodden, from seamen to fugitive slaves and freedmen. Early life and education Dana was born in Cambridge, Massachusetts, on August 1, 1815 into a family that had settled in colonial America in 1640, counting Anne Bradstreet among its ancestors.Sullivan, 1972, p. 98. His father was the poet and critic Richard Henry Dana Sr. As a boy, Dana studied in Cambridgeport under a strict schoolmaster named Samuel Barrett, alongside fellow Cambridge native and future writer James Russell Lowell. Barrett was infamous as a disciplinarian who punished his students for any infraction by flogging. He also often pulled students by their ears and, on one such occasion, nearly pulled Dana's ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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