Instruct: Given a question, retrieve documents that answer the question.
Query: What are anchor made of?
Longships for the most part used two different kinds of anchors. The most common was a natural wood yoke formed from a tree branch. The weight was supplied by a stone passing laterally through the U of the yoke. The top of the yoke was closed by either a length of hardwood or a curved iron head, which kept the stone in place. One side of the head stuck out so it could dig into mud or sand. In the Ladby ship burial in Denmark, a unique iron anchor has been found, resembling the modern fisherman's anchor but without the crossbar. The cross bar may have rusted away. This anchor—made of Norwegian iron—has a long iron chain to which the hemp warp was attached. This construction has several advantages when anchored in deep waters or in rough seas.
The material of choice for producing these screws is stainless steel typically 18-8 (303). At the tip of the screw most commonly a stainless steel ball is either pressed or glued into place to provide a single point contact for the surface being moved. Common usage has shown the glue method of attaching the ball to be troublesome in many applications as some commonly used glues (Super Glue) tend to outgas and degrade over time in this application.
There are four basic types of knitting needles (also called "knitting pins"). The first and most common type consists of two slender, straight sticks tapered to a point at one end, and with a knob at the other end to prevent stitches from slipping off. Such needles are usually 10-16 inches long but, due to the compressibility of knitted fabrics, may be used to knit pieces significantly wider. The most important property of needles is their diameter, which ranges from below 2 mm to 25 mm (roughly 1 inch). The diameter affects the size of stitches, which affects the gauge of the knitting and the elasticity of the fabric. Thus, a simple way to change gauge is to use different needles, which is the basis of uneven knitting. Although knitting needle diameter is often measured in millimeters, there are several different size systems, particularly those specific to the United States, the United Kingdom and Japan; a conversion table is given in the knitting needle article. Such knitting needles may be made out of any materials, but the most common materials are metals, wood, bamboo, and plastic. Different materials have different frictions and grip the yarn differently; slick needles such as metallic needles are useful for swift knitting, whereas rougher needles such as bamboo are less prone to dropping stitches. The knitting of new stitches occurs only at the tapered ends, and needles with lighted tips have been sold to allow knitters to knit in the dark.
Swiss electrical engineer George de Mestral invented his first touch fastener when, in 1941, he went for a walk in the woods and wondered why Burdock seeds clung to his coat and dog. He discovered it could be turned into something useful. He patented it in 1955 and subsequently refined and developed its practical manufacture until its commercial introduction in the late 1950s.
The largest marine algae are kelp species, which include bull kelp ("Durvillaea antarctica"), which can reach over long and is thought to be the strongest kelp in the world. As many as 47 individual plants can live on , and they can grow at a day. Kelp that is broken off its anchor provides a valuable food source for many animals, as well as providing a method of oceanic dispersal for animals such as invertebrates to travel across the Southern Ocean by riding floating kelp.
A screw is a type of fastener, in some ways similar to a bolt (see "Differentiation between bolt and screw" below), typically made of metal, and characterized by a helical ridge, known as a "male thread" (external thread). Screws are used to fasten materials by digging in and wedging into a material when turned, while the thread cuts grooves in the fastened material that may help pull fastened materials together and prevent pull-out. There are many screws for a variety of materials; those commonly fastened by screws include wood, sheet metal, and plastic.
There are approximately 400 licensed gondoliers in Venice in their distinctive regalia and a similar number of the boats, down from 10,000 that travelled the canals two centuries ago. Many gondolas are lushly appointed with crushed velvet seats and Persian rugs. Less well-known is the smaller sandolo. At the front of each gondola that works in the city, there is a large piece of metal called the "fèro" (iron). Its shape has evolved through the centuries, as documented in many well-known paintings. Its form, topped by a likeness of the Doge's hat, became gradually standardized, and was then fixed by local law. It consists of six bars pointing forward representing the Sestieri of the city, and one that points backwards representing the Giudecca.
Arrow Dynamic's forerunner, Arrow Development, was founded in 1946 when Ed Morgan, Karl Bacon, Bill Hardiman, and Angus "Andy" Anderson, started a machine shop at 243 Moffett Boulevard, just north of downtown Mountain View, California. They started out selling used machine tools, building truck parts and repairing cars until about 1950 when they built their first merry-go-rounds for San Jose's Alum Rock Park.
The entire monument is made of Pentelic marble, from Mt. Pentelikon, 18.2 km northeast of the arch. Pentelic marble was used for the Parthenon and many other notable structures in Athens, although its quality can vary significantly. The marble used for the arch is of a lower grade that had more inclusions than that used in the best Athenian buildings. The arch was constructed without cement or mortar from solid marble, using clamps to connect the cut stones. It is 18m high, 13.5m wide, and 2.3m in depth. Its design is fully symmetrical from front to back and side to side.
A knitting needle or knitting pin is a tool in hand-knitting to produce knitted fabrics. They generally have a long shaft and taper at their end, but they are not nearly as sharp as sewing needles. Their purpose is two-fold. The long shaft "holds" the active (unsecured) stitches of the fabric, to prevent them from unravelling, whereas the tapered ends are used to "form new stitches". Most commonly, a new stitch is formed by inserting the tapered end through an active stitch, catching a loop (also called a bight) of fresh yarn and drawing it through the stitch; this secures the initial stitch and forms a new active stitch in its place. In specialized forms of knitting the needle may be passed between active stitches being held on another needle, or indeed between/through inactive stitches that have been knit previously.
Scientific Anglers was founded in 1945 in Midland, Michigan. Scientific Anglers' notable developments include the introduction of PVC coated designs of contemporary floating fly lines in 1952 and the development of sinking fly lines in 1960. Their introduction of PVC coated fly lines was largely responsible for the decline of the old line sizing system that used letters—HCH—to designate the taper and weight of silk fly lines. Because PVC coated lines were significantly different from silk lines, a new system evolved that identified lines with their grain weight in the first 30 feet of line (i.e. 5 wgt) and a two letter designation—DT (Double Taper), (ST-Single Taper) or (WF-Weight Forward) to identify the line taper.
In 1921, Andrew Kanelos opened a small candy store in Chicago, Illinois. While he initially called his store "Andy's Candies" in reference to himself, he quickly found that men did not like giving boxes of candy with another man's name to their wives and girlfriends. As such, he changed the spelling of the business to "Andes Candies." In 1980, Andes was purchased by the Swiss candy company Interfood (later Jacobs Suchard). When Jacobs Suchard bought Brach's in 1987, Andes became part of that division. When Jacobs Suchard was sold to Kraft General Foods in 1990, Brach's was kept separate by owner Klaus J. Jacobs. In need of cash, Brach's sold Andes to Tootsie Roll Industries in 2000.
In 1975, the Greek government began a concerted effort to restore the Parthenon and other Acropolis structures. After some delay, a Committee for the Conservation of the Acropolis Monuments was established in 1983. The project later attracted funding and technical assistance from the European Union. An archaeological committee thoroughly documented every artifact remaining on the site, and architects assisted with computer models to determine their original locations. Particularly important and fragile sculptures were transferred to the Acropolis Museum. A crane was installed for moving marble blocks; the crane was designed to fold away beneath the roofline when not in use. In some cases, prior re-constructions were found to be incorrect. These were dismantled, and a careful process of restoration began. Originally, various blocks were held together by elongated iron H pins that were completely coated in lead, which protected the iron from corrosion. Stabilizing pins added in the 19th century were not so coated, and corroded. Since the corrosion product (rust) is expansive, the expansion caused further damage by cracking the marble.
Walter Hunt invented the safety pin by forming an eight-inch brass pin into a bent pin with a spring and guard. He sold the rights to his invention to pay a debt to a friend, not knowing that he could have made millions of dollars.
"Shawmut" and "Tremont" were acquired by the United States Government through the agency of the Panama Railroad Company's Panama Railroad Steamship Line, whose assets were entirely owned by the government and critical to construction of the canal, to serve between New York and the Atlantic terminus during canal construction. Both ships were renamed for features of the canal; "Shawmut" for the Pacific side terminus Ancon and "Tremont" as for the Canal's Atlantic port. Though not the first vessel to make a complete transit, "Ancon" made the first official and ceremonial transit with a delegation of some two hundred dignitaries aboard. After the end of World War I the ship saw very brief service from 28 March to 25 July 1919 as a commissioned United States Ship, USS "Ancon" (ID-1467), making two round trip voyages from the New York Port of Embarkation to France returning troops home. "Ancon" was returned to Panama Canal service and was in service with the canal until 1939 when the ship was sold to private parties known as the Permanente Steamship Company and renamed Permanente.
Jewellery (British English) or jewelry (American English) consists of small decorative items worn for personal adornment, such as brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. Jewellery may be attached to the body or the clothes. From a western perspective, the term is restricted to durable ornaments, excluding flowers for example. For many centuries metal, often combined with gemstones, has been the normal material for jewellery, but other materials such as shells and other plant materials may be used. It is one of the oldest type of archaeological artefact – with 100,000-year-old beads made from "Nassarius" shells thought to be the oldest known jewellery. The basic forms of jewellery vary between cultures but are often extremely long-lived; in European cultures the most common forms of jewellery listed above have persisted since ancient times, while other forms such as adornments for the nose or ankle, important in other cultures, are much less common.
Animal intestine is the most resilient material used to make tennis strings. It has better tension retention than any other material, and also is softer than any other material used for tennis strings. It provides the most energy return, meaning it is the most efficient string. It remains soft at high tensions while other materials tend to stiffen dramatically. This allows gut string to enable players to string rather tightly to improve ball control without losing much rebound efficiency (power) and without greatly increasing impact shock, which can hurt the elbow and other joints.
Angel Oak is a Southern live oak ("Quercus virginiana") located in Angel Oak Park on Johns Island near Charleston, South Carolina. The tree is estimated to be 400-500 years old. It stands 66.5 ft (20 m) tall, measures 28 ft (8.5 m) in circumference, and produces shade that covers 17,200 square feet (1,600 m). Its longest branch distance is 187 ft in length. Angel Oak was the 210th tree to be registered with the Live Oak Society.
The oak derives its name from the estate of Justus Angel and his wife, Martha Waight Tucker Angel. Local folklore tells stories of ghosts of former slaves appearing as angels around the tree.
Once the preliminary wool preparation steps are completed, knitting can begin. Early materials for needles included whale bone, deer bone, telephone wire, bamboo chopsticks, and wood. Today, knitters primarily use readily available and inexpensive plastic or metal needles. No matter which material is used for needles, the sizes vary from 4-7.5mm depending on the weight of the hand spun yarn.
The new locks opened for commercial traffic on 26 June 2016, and the first ship to cross the canal using the third set of locks was a modern New Panamax vessel, the Chinese-owned container ship "Cosco Shipping Panama". The original locks, now over 100 years old, allow engineers greater access for maintenance, and are projected to continue operating indefinitely.
The second type of knitting needles are straight, double-pointed knitting needles (also called "dpns"). Double-pointed needles are tapered at both ends, which allows them to be knit from either end. Dpns are typically used for circular knitting, especially smaller tube-shaped pieces such as sleeves, collars, and socks; usually one needle is active while the others hold the remaining active stitches. Dpns are somewhat shorter (typically 7 inches) and are usually sold in sets of four or five. 
Cable needles are a special case of dpns, although they usually are not straight, but dimpled in the middle. Cable needles are typically very short (a few inches), and are used to hold stitches temporarily while others are being knitted. Cable patterns are made by permuting the order of stitches; although one or two stitches may be held by hand or knit out of order, cables of three or more generally require a cable needle.
The ancient Greeks used baskets of stones, large sacks filled with sand, and wooden logs filled with lead. According to Apollonius Rhodius and Stephen of Byzantium, anchors were formed of stone, and Athenaeus states that they were also sometimes made of wood. Such anchors held the vessel merely by their weight and by their friction along the bottom. Iron was afterwards introduced for the construction of anchors, and an improvement was made by forming them with teeth, or "flukes", to fasten themselves into the bottom.
The stone anchors have been noticed close to the present lighthouse in inter tidal zone. Being in the high tidal range, the stone anchors that are lying in 5 to 10 m water depth during high tide get exposed during low tide. These stone anchors are found either partially buried or exposed on the gravel bed. The seabed at the finding spot of the anchor consisted of gravel and fine sand. The majority of the anchors are of Indo-Arabia type and one stone anchor falls in the category of composite type. The Indo-Arabia type anchors of typically made from a vertical stone block with often square section with two lower holes are rectangular/ square and an upper circular hole. Two anchors in the group of Indo-Arab type are having uniform vertical deep and wide groove on all the four faces of the anchor. The broken single composite anchor is made of a thin limestone block with two lower holes are square and two circular holes are placed randomly on upper side. The detail measurements and drawing could be completed just of 14 anchors due to tidal time and muddy seabed and hence rest anchors were only photographed. Many stone anchors are fragmented in nature. Majority of the anchors are parted with lower 2 holes and sometimes holes also broken which might have been broken during manufacturing stage. The raw material used for these anchors are hard basaltic, sedimentary and a few of conglomeratic material. A fragmentary anchor is the biggest anchor found from here. Only lower portion is surviving and is very similar to those reported from Mithi Virdi. There is a stone block without any holes noticed similar to the Indo-Arabia type anchor.
The ancient Greeks used baskets of stones, large sacks filled with sand, and wooden logs filled with lead, which, according to Apollonius Rhodius and Stephen of Byzantium, were formed of stone; and Athenaeus states that they were sometimes made of wood. Such anchors held the vessel merely by their weight and by their friction along the bottom. Lashing tree branches to the stone formed teeth or "flukes", to fasten themselves into the bottom. Advances in woodworking and metallurgy encouraged development of improved shapes for more compact, durable, and efficient anchors.
Crinoid “anchors” were the parts of the crinoid stem that attached the crinoid to a hard surface, such as a rock, to allow the animal to out-compete other filter-feeding animals in its ecosystem. A crinoid would have several anchors that were also made of disks. These are not rare, but are not commonly found in crinoid deposits.