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Squash Ball Machine
A squash ball machine is a mechanical device that automatically throws out squash balls at different speeds and angles. Its main purpose is to help players to develop their ball hitting technique. Overview The features of squash ball machines are modeled after the rules of squash and the constituency of squash balls. Squash is a ballgame that is played by hitting a ball with a racket against a wall, similar to a backboard, so that the ball bounces off the wall. The opponent player has to hit the ball back against the wall without letting the ball bounce more than once. The game can be played either by two people (the "singles" version), or by four people (the doubles version), in either a smaller court (singles and softball doubles) or a larger one ( hardball doubles). The balls used in squash are small rubber balls that can differ in terms of diameter, weight and softness. These features determine the speed and bouncing amplitude of the ball, with softer balls being generally ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squash (sports)
Squash is a racket-and-ball sport played by two or four players in a four-walled court with a small, hollow, rubber ball. The players alternate in striking the ball with their rackets onto the playable surfaces of the four walls of the court. The objective of the game is to hit the ball in such a way that the opponent is not able to play a valid return. There are about 20 million people who play squash regularly world-wide in over 185 countries. The governing body of Squash, the World Squash Federation (WSF), is recognized by the International Olympic Committee (IOC), but the sport is not part of the Olympic Games, despite a number of applications. Supporters continue to lobby for its incorporation in a future Olympic program. The Professional Squash Association (PSA) organizes the pro tour. History Squash has its origins in the older game of rackets which was played in London's prisons in the 19th century. Later, around 1830, boys at Harrow School noticed that a punctured bal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protective Eyewear
Eye protection is protective gear for the eyes, and sometimes face, designed to reduce the risk of injury. Examples of risks requiring eye protection can include: impact from particles or debris, light or radiation, wind blast, heat, sea spray or impact from some type of ball or puck used in sports. Eye protection are typically separated into categories based on the style of eye wear and the hazard they are designed to reduce. There categories include: Spectacles with side protection; Goggles; Welding helmet; Welding Hand Shields; Non-Rigid Helmets (hoods); Face shield; and Respirator Face pieces. Styles Spectacles Safety glasses or spectacles, although often used as a catch-all term for all types of eye protection, specifically revers to protective equipment that closely resembles common eye wear. To meet most national standards, spectacles must include side shields to reduce the ability of debris to get behind the lenses from the side. Safety glasses can often mount i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bowling Machine
In cricket a bowling machine is a device which enables a batsman to practise (usually in the nets) and to hone specific skills through repetition of the ball being bowled at a certain length, line and speed. It can also be used when there is no-one available to bowl, or no one of the desired style or standard. There are a number of different types of bowling machine available to cricket coaches, each quite different in the ways they achieve the required delivery, though most allow the use of remote control, so that a coach can be closer to a batsman when the stroke is played. Mechanical bowling machines This type of machine is by far the most common. It is simple, strong and reliable, as well as being able to bowl a useful range of deliveries. How they work The main mechanism of the machine consists of two heavy wheels, between 30 and 50 cm in diameter, fitted with solid or pneumatic rubber tyres, each driven by its own electric motor. These are mounted in a frame su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tactic (method)
A tactic is a conceptual action or short series of actions with the aim of achieving a short-term goal. This action can be implemented as one or more specific tasks. The term is commonly used in business, protest and military contexts, as well as in chess, sports or other competitive activities. The word originated from the Ancient Greek ''taktike'', meaning ''art of arrangement''. Distinction from strategy A strategy is a set of guidelines used to achieve an overall objective, whereas tactics are the specific actions aimed at adhering to those guidelines. Military usage In military usage, a military tactic is used by a military unit of no larger than a division to implement a specific mission and achieve a specific objective, or to advance toward a specific target. The terms tactic and strategy are often confused: tactics are the actual means used to gain an objective, while strategy is the overall campaign plan, which may involve complex operational patterns, activity, and d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serve (tennis)
A serve (or, more formally, a service) in tennis is a shot to start a point. A player will hit the ball with a racquet so it will fall into the diagonally opposite service box without being stopped by the net. Normally players begin a serve by tossing the ball into the air and hitting it (usually near the highest point of the toss). The ball can only touch the net on a return and will be considered good if it falls on the opposite side. If the ball contacts the net on the serve but then proceeds to the proper service box, it is called a ''let''; this is not a legal serve in the major tours (but see below) although it is also not a ''fault''. Players normally serve overhead; however serving underhand is allowed. The serve is the only shot a player can take their time to set up instead of having to react to an opponent's shot; however, as of 2012, there is a 25-second limit to be allowed between points. The serve is one of the most difficult shots for a novice, but once mastered it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tennis Ball
A tennis ball is a ball designed for the sport of tennis. Tennis balls are fluorescent yellow in organised competitions, but in recreational play can be virtually any color. Tennis balls are covered in a fibrous felt which modifies their aerodynamic properties, and each has a white curvilinear oval covering it. Specifications Modern tennis balls must conform to certain criteria for size, weight, deformation, and bounce criteria to be approved for regulation play. The International Tennis Federation (ITF) defines the official diameter as . Balls must have masses in the range . Yellow and white are the only colors approved by the ITF, and most balls produced are a fluorescent yellow known as "optic yellow", first introduced in 1972 following research demonstrating they were more visible on television. Tennis balls are filled with air and are surfaced by a uniform felt-covered rubber compound. The felt delays flow separation in the boundary layer which reduces aerodynamic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squash Tennis
Squash tennis is an American variant of squash, but played with a ball and racquets that are closer to the equipment used for lawn tennis, and with somewhat different rules. For younger players the game offers the complexity of squash and the speed of racquetball. It also has exercise and recreational potential for older players. Court Squash tennis is played in various four-walled courts. The front wall (against which the ball is served) features a telltale (usually clad in tin) at the bottom couple feet from the floor, a service line about from the floor, and an out-of-bounds line around from the floor. The back wall out line is from the floor. There are two required lines on the floor: a service line about from the back wall, and a center court line running at least from the front wall to the service line. Unlike a squash racquets court, there are no service boxes. There are four types of courts: North American squash court A North American squash court is . Orig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Squash Federation
The World Squash Federation (WSF) is the international federation for squash, an indoor racket sport which was formerly called "squash rackets". The WSF is recognised by the International Olympic Committee (IOC) as the International Federation (IF) for squash, and is also a member of the Global Association of International Sports Federations and the Association of the IOC Recognised International Sports Federations (ARISF). It is based in Hastings in England. As of 2021 it has 122 member federations. The first squash court was built in England in 1865; there are now around 50,000 courts in more than 185 nations worldwide. To harness this growth and to promote and co-ordinate the sport, the International Squash Rackets Federation (ISRF) was formed in 1967, its name being changed in 1992 to the World Squash Federation (WSF). Presidents Below is the list of presidents since 1967 : Membership The WSF has 122 Members, all of whom are National Associations of squash, recognised by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Remote Control
In electronics, a remote control (also known as a remote or clicker) is an electronic device used to operate another device from a distance, usually wirelessly. In consumer electronics, a remote control can be used to operate devices such as a television set, DVD player or other home appliance. A remote control can allow operation of devices that are out of convenient reach for direct operation of controls. They function best when used from a short distance. This is primarily a convenience feature for the user. In some cases, remote controls allow a person to operate a device that they otherwise would not be able to reach, as when a garage door opener is triggered from outside. Early television remote controls (1956–1977) used ultrasonic tones. Present-day remote controls are commonly consumer infrared devices which send digitally-coded pulses of infrared radiation. They control functions such as power, volume, channels, playback, track change, heat, fan speed, and vari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Racket (sports Equipment)
A racket, or racquet, is a sports implement used for striking a ball or shuttlecock in games such as squash, tennis, racquetball, badminton and padel. In the strictest sense a racket consists of a handled frame with an open hoop across which a network of strings is stretched tightly. Some rackets may have a solid or perforated hitting surface instead of a network of strings. Such rackets may be called a paddle or bat. Collectively, these games are known as racket sports. Racket design, materials and manufacturing has changed considerably over the centuries. The frame of rackets for all sports was traditionally made of solid wood (later laminated wood) and the strings of animal intestine known as catgut. The traditional racket size was limited by the strength and weight of the wooden frame which had to be strong enough to hold the strings and stiff enough to hit the ball or shuttle. Manufacturers started adding non-wood laminates to wood rackets to improve stiffness. Non-wood r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Direct Current
Direct current (DC) is one-directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current. The abbreviations ''AC'' and ''DC'' are often used to mean simply ''alternating'' and ''direct'', as when they modify '' current'' or '' voltage''. Direct current may be converted from an alternating current supply by use of a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction. Direct current may be converted into alternating current via an inverter. Direct current has many uses, from the charging of batteries to large po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
