Instruct: Given a question, retrieve relevant passages that can help answer the question.
Query: Do tennis strings make a difference?
In tennis, the strings are the part of a tennis racquet which make contact with the ball. The strings form a woven network inside the head (or "hoop") of the racquet. Strings have been made with a variety of materials and possess varying properties that have been measured, such as dynamic stiffness, tension retention, thickness (gauge), string texture (shape of the string), and rebound efficiency.
Until such time as a special ball is specifically made for elle, tennis balls are used. The fur on the ball could be removed/shaved before use but removing of fur to make the rubber visible is strictly prohibited. A rubber ball or another light ball could be used instead of a tennis ball, but it is of paramount importance that the ball used should be common to both teams.
Unlike latex-based technology underlying the modern lawn-tennis ball, the game still uses a cork-based ball very close in design to the original balls used in the game. The diameter balls are handmade and consist of a core made of cork with fabric tape tightly wound around it and covered with a hand-sewn layer of heavy, woven, woollen cloth, traditionally Melton cloth (not felt, which is unwoven and not strong enough to last as a ball covering). The balls are traditionally white, but around the end of the 20th century "optic yellow" was introduced for improved visibility, as had been done years earlier in lawn tennis. The balls are much less bouncy than lawn tennis balls, and weigh about (lawn tennis balls typically weigh 2 ounces).
A tennis backboard is a simple wall usually made from some kind of fiberboard and located at a tennis court. It should have a tennis net either drawn or painted at the proper height. It is designed to allow a single person to practice by hitting a tennis ball against the wall so the ball is returned, much like a second player would return it.
The international rules specify that the game is played with a sphere having a mass of and a diameter of . The rules say that the ball shall bounce up when dropped from a height of onto a standard steel block thereby having a coefficient of restitution of 0.89 to 0.92. balls are now made of a polymer instead of celluloid as of 2015, colored white or orange, with a matte finish. The choice of ball color is made according to the table color and its surroundings. For example, a white ball is easier to see on a green or blue table than it is on a grey table. Manufacturers often indicate the quality of the ball with a star rating system, usually from one to three, three being the highest grade. As this system is not standard across manufacturers, the only way a ball may be used in official competition is upon ITTF approval (the ITTF approval can be seen printed on the ball).
In the early 1870s lawn tennis arose in Britain through the pioneering efforts of Walter Clopton Wingfield and Harry Gem, often using Victorian lawns laid out for croquet. Wingfield marketed tennis sets, which included rubber balls imported from Germany. After Charles Goodyear invented vulcanised rubber, the Germans had been most successful in developing vulcanised air-filled rubber balls. These were light and coloured grey or red with no covering. John Moyer Heathcote suggested and tried the experiment of covering the rubber ball with flannel, and by 1882 Wingfield was advertising his balls as clad in stout cloth made in Melton Mowbray.
Different clubs use slightly different court sizes, with the hosts of any given tournament permitted to choose the court size for that event, but the standard court is 9.45m long by 4.1m wide. It is split in half lengthways by a line and widthways by a net, at a height of 1.75m, with each player (in singles) or team (in doubles) always remaining on their side of the net.
Purcell designed a low, bleached-white canvas-and-rubber badminton sneaker for the B.F. Goodrich Company, known as PF Flyers in 1935. The shoe would provide better support on badminton courts because of a steel shank embedded in its heel. For most of the twentieth century, Jack Purcell's tennis sneaker was required wear on all grass and clay tennis courts in the United States and, at least for a time, on newer, all-weather asphalt courts as well. Unlike basketball sneakers (running shoes hadn't been invented yet), Jack Purcell sneakers had perfectly flat soles, unmarred by grooves that could tear up clay or grass and skew the elasticity of tennis ball bounces. Everyone from the youngest learner to professional and amateur tennis stars on the international tour wore Purcell sneakers; no other company made them. In 1972, Converse purchased PF Flyers (now owned by New Balance), along with the trademark rights of Jack Purcell sneakers. When Nike purchased Converse in 2003, Jack Purcell sneakers were kept in production, and is still manufactured today. Purcell-type basketball sneakers are now no different from Converse Chuck Taylor All-Stars, except they have the trademark blue across their toes. Classic Purcell tennis sneakers are unchanged in appearance from their heyday in the 1950s and 1960s, when they were first nicknamed "Blue Tips" and "Smilies", but they have risen in price from about $20 in 1965 to as much as $150 or more today. Converse "Jack Purcell" basketball sneakers are also popular, but more for their vintage fashion appeal than for athletic use.
The currently available models have ball capacities of 50-60 balls. Both ball speed range and ball frequencies are adjustable and vary from 30 to 150 km/h and 1.5-12 balls per second, respectively, with the .75 second interval suitable for quick volleys and 10 second interval for other strokes. Changing the speed and frequency of the ball coming out of the machine is intended to help the player to visualize real-game situations where the ball does not always come back into play at the same speed. The adjustable speed is also useful for increasing the speed as the player becomes more skillful.
There have been many comparisons of Stradivarius and other old violins with more recent violins since 1817. They generally have found no differences in either subjective impressions or acoustic analysis. However, the tests have been criticized on various grounds. In a well-known 1977 experiment, Isaac Stern and Pinchas Zukerman and a classical violin dealer, Charles Beare, listened to a Stradivarius, a Guarneri, and a 1976 British violin. They were also unable to identify which instrument was which, and two of them mistakenly identified the 1976 violin as the Stradivarius.
While many world-class soloists play violins by Antonio Stradivari, there are notable exceptions. For example, Christian Tetzlaff formerly played "a quite famous Strad", but switched to a violin made in 2002 by Stefan-Peter Greiner. He states that the listener cannot tell that his instrument is modern, and he regards it as excellent for Bach and better than a Stradivarius for "the big Romantic and 20th-century concertos."
Nearly all basketballs have an inflatable inner rubber bladder, generally wrapped in layers of fiber and then covered with a surface made either from leather (traditional), rubber, or a synthetic composite. As in most inflatable balls, there is a small opening that allows the pressure to be increased or decreased.
In a test in 2009, the British violinist Matthew Trusler played his 1711 Stradivarius, said to be worth two million U.S. dollars, and four modern violins made by the Swiss violin-maker . One of Rhonheimer's violins, made with wood that the Empa (Swiss Federal Laboratories for Materials Science and Technology) researcher Francis Schwarze had treated with fungi, received 90 of the 180 votes for the best tone, while the Stradivarius came second with 39 votes. The majority (113) of the listeners misidentified the winning violin as the Stradivarius.
Inspired by The Beatles’ use of strings on “Eleanor Rigby” and “Yesterday”, DiNizio chose to include string arrangements on most of the songs on the album. “We didn’t take the material and do wacky things with it just to be different,” DiNizio said. “I went to someone who was alive and making records when Buddy was still alive — Charles Calello — to arrange all of the strings.” DiNizio said of the album: "I wanted to honor the memory of the musical artist from whom I got the most inspiration from – and in fact, provided the necessary encouragement to want to be a songwriter. I felt that on the fiftieth anniversary of his passing that someone should say something, but I didn’t want to do a typical knock-off Buddy Holly album, so I took a more baroque string-driven direction. On virtually every track there is a string quartet. So, it honors his memory, but I make the songs my own.”
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.
Wire has many uses. It forms the raw material of many important manufacturers, such as the wire netting industry, engineered springs, wire-cloth making and wire rope spinning, in which it occupies a place analogous to a textile fiber. Wire-cloth of all degrees of strength and fineness of mesh is used for sifting and screening machinery, for draining paper pulp, for window screens, and for many other purposes. Vast quantities of aluminium, copper, nickel and steel wire are employed for telephone and data cables, and as conductors in electric power transmission, and heating. It is in no less demand for fencing, and much is consumed in the construction of suspension bridges, and cages, etc. In the manufacture of stringed musical instruments and scientific instruments, wire is again largely used. Carbon and stainless spring steel wire have significant applications in engineered springs for critical automotive or industrial manufactured parts/components. Pin and hairpin making; the needle and fish-hook industries; nail, peg, and rivet making; and carding machinery consume large amounts of wire as feedstock.
In the same year, Dr. Julian W. Hill, another member of the Carothers team, began work again on attempting to produce a polyester with a molecular weight of above 4,000. His efforts were soon met with great success when he produced a synthetic polymer with a molecular weight of about 12,000. The high molecular weight allowed the melted polymer to be stretched out into strings of fiber. Thus was created the first synthetic silk, described by the chemists as a superpolyester.
The third needle type consists of circular needles, which are long, flexible double-pointed needles. The two tapered ends (typically long) are rigid and straight, allowing for easy knitting; however, the two ends are connected by a flexible strand (usually nylon) that allows the two ends to be brought together. Circular needles are typically 24-60 inches long, and are usually used singly or in pairs; again, the width of the knitted piece may be significantly longer than the length of the circular needle. Special kits are available that allow circular needles of various lengths and diameters to be made as needed; rigid ends of various diameters may be screwed into strands of various lengths. The ability to work from either end of one needle is convenient in several types of knitting, such as slip-stitch versions of double knitting. Circular needles may be used for flat or circular knitting.
In May 2014 he announced his retirement, to take effect after Israel's Davis Cup tie in September. In April 2015, Ram, CEO of Pulse Play, announced his new startup - wearable technology and an app for amateur tennis players around the world.
Unlike Western tonality and music theory the universal theory of the Phanariotes does not distinguish between major and minor scales, even if they transcribed Western polyphony into Byzantine neumes, and in fact, the majority of the models of the Byzantine Octoechos, as they are performed in Mediterranean churches by traditional singers, would lose their proper intonation and expression, if they were played on a conventionally tuned piano. Exactly the familiarity with microtonal intervals was an advantage, which made the Chrysanthine or Neobyzantine notation as a medium of transmission more universal than any Western notation system. Among others even Western staff notation and Eastern neume notation had been used for transcriptions of Ottoman classical music, despite their specific traditional background.
Historically the game developed on natural grass turf. In the early 1970s, "synthetic grass" fields began to be used for hockey, with the first Olympic Games on this surface being held at Montreal in 1976. Synthetic pitches are now mandatory for all international tournaments and for most national competitions. While hockey is still played on traditional grass fields at some local levels and lesser national divisions, it has been replaced by synthetic surfaces almost everywhere in the western world. There are three main types of artificial hockey surface:Since the 1970s, sand-based pitches have been favoured as they dramatically speed up the game. However, in recent years there has been a massive increase in the number of "water-based" artificial turfs. Water-based synthetic turfs enable the ball to be transferred more quickly than on sand-based surfaces. It is this characteristic that has made them the surface of choice for international and national league competitions. Water-based surfaces are also less abrasive than sand-based surfaces and reduce the level of injury to players when they come into contact with the surface. The FIH are now proposing that new surfaces being laid should be of a hybrid variety which require less watering. This is due to the negative ecological effects of the high water requirements of water-based synthetic fields. It has also been stated that the decision to make artificial surfaces mandatory greatly favoured more affluent countries who could afford these new pitches.
Since the 20th century, with the advent of steel and synthetic core strings, most bowed instrument string makers market their strings by tension rather than by diameter. They typically make string sets in three tension levels:"heavy", "medium", and "light" (German "stark", "mittel", and "weich"). These tension levels are not standardized between manufacturers, and do not correlate to specific diameters. One brand's medium strings may have quite a different tension from another brand's medium. Based on available historical records, gut strings were sold before 1900 in a similar way.
In tennis, the strings are the part of a tennis racquet which make contact with the ball. The strings form a woven network inside the head (or "hoop") of the racquet. Strings have been made with a variety of materials and possess varying properties that have been measured, such as dynamic stiffness, tension retention, thickness (gauge), string texture (shape of the string), and rebound efficiency.
Its principal drawbacks are much higher cost to manufacture and purchase than other materials, weakness to shear stresses from off-center hits (typical of beginning players), variable quality control depending upon the brand, batch, age, storage conditions, and grade, difficulty of stringing due to its delicacy, and poor durability when wetted with water. Natural gut is very sensitive to different types of weather and those players who use it normally carry several different racquets with different tensions to compensate for this. Some players, particularly those who hit flat shots and hit the sweet spot consistently, find high-quality gut to be more durable than many other types of strings due to its outstanding tension retention. This may help to offset the high initial cost. The use of a dense string pattern also generally improves the longevity of natural gut.
Racquets are strung either with two separate strings (and thus four knots), or with a single string (resulting in only two knots). Sometimes, a hybrid of two different string types may be used in the same racquet. Traditionally, a double half hitch has been used to tie off tennis string, along with a starting knot. Recently, new kinds of knots have been used called the "pro-knot" and "Parnell knot". Along with the use of a starting clamp, this can make all the knots identical, and improve the aesthetics of a string job.