Cricket bat

A cricket bat is used by batsmen in the sport of cricket. It is usually made of willow wood. Its use is first mentioned in 1624.

This specialised bat is shaped something like a paddle, consisting of a padded handle similar to - but sturdier than - that of a tennis racquet, which is usually cylindrical in shape. This widens into the blade of the bat, a wider wooden block flat on one side and with a V-shaped ridge on the other to provide greater air flow in the follow through and greater strength to the over-all bat. The flat side (the front of the bat) is used to hit the ball. The point at which the handle widens into the blade is known as the shoulder of the bat, and the bottom of the blade is known as the toe of the bat.

The bat is traditionally made from willow wood, specifically from the Cricket-bat Willow (Salix alba var. caerulea), treated with raw (unboiled) linseed oil. The oil has a protective function, but also increases surface friction with the ball, thus control. This wood is used as it is very tough and shock-resistant, not being significantly dented nor splintering on the impact of a cricket ball at high speed, while also being light in weight. It incorporates a wooden spring design where the handle meets the blade. The current design of a cane handle spliced into a willow blade was the invention in the 1880s of Charles Richardson, a pupil of Brunel and the chief engineer of the Severn railway tunnel.[1] The rules of the game limit the allowable size for a bat as not more than 38 in (965 mm) long and the blade may not be more than 4.25 in (108 mm) wide. Bats typically weigh from 2 lb 8 oz to 3 lb (1.1 to 1.4 kg) though there is no standard. The handle is usually covered with a rubber or cloth sleeve to enhance grip and the face of the bat may have a protective film.

Modern bats are usually machine made, however a few specialists still make hand-made bats, mostly for professional players.

Bats were not always this shape. Before the 18th century bats tended to be shaped similarly to how hockey sticks are currently shaped. This may well have been a legacy of the game's reputed origins. Although the first forms of cricket are lost in the mists of time, it may be that the game was first played using shepherds' crooks.

Until the rules of cricket were formalised in the 19th century, the game usually had lower stumps, the ball was bowled underarm (whereas now it is bowled overarm except on very rare occasions), and batsmen did not wear protective pads, as they do nowadays. As the game changed, so it was found that a differently shaped bat was better. The bat which is generally recognised as the oldest Bat still in existence is dated 1729 and is on display in the Sandham Room at the Oval in London.

Cricket ball

Manufacture
Cricket balls are made from a core of cork, which is layered with tightly wound string, and covered by a leather case with a slightly raised sewn seam. The covering is constructed of four pieces of leather shaped similar to the peel of a quartered orange, but one hemisphere is rotated by 90 degrees with respect to the other. The "equator" of the ball is stitched with string to form the seam, with a total of six rows of stitches. The remaining two joins between the leather pieces are left unstitched.

For men's cricket, the ball must weigh between 5.5 and 5.75 ounces (155.9 and 163.0 g) and measure between 8 13/16 and 9 in (224 and 229 mm) in circumference. Balls used in women's and youth matches are slightly smaller.

Cricket balls are traditionally dyed red, and red balls are used in Test cricket and First-class cricket. White balls were introduced when one-day matches began being played at night under floodlights, as they are more visible at night. Professional one-day matches are now played with white balls, even when they are not played at night. Other colours have occasionally been experimented with, such as yellow and orange for improved night visibility, but the colouring process has so far rendered such balls unsuitable for professional play because they wear differently to standard balls. Recently the ICC is in talks for testing with pink balls in ODI matches. The white ball has been found to swing a lot more during the first half of the innings than the red ball. It also deteriorates faster than the red ball.

Cricket balls are expensive. As of 2007, the ball used in first class cricket in England has a recommended retail price of £70 (USD 140).[1] In test match cricket this ball is used for a minimum of 80 overs (theoretically five hours and twenty minutes of play). In professional one day cricket, at least two new balls are used for each match. Amateur cricketers often have to use old balls, or cheap substitutes, in which case the changes in the condition of the ball experienced during an innings in professional cricket are not replicated.

Condition of acricket ball
A new, highly polished ball is used at the start of each innings in a match. A cricket ball may not be replaced except under specific conditions described in the Laws of Cricket:

If the ball becomes damaged or lost.
If the condition of the ball is illegally modified by a player.
In Test cricket, after 80 overs, the captain of the bowling side has the option to take a new ball.
In One Day Internationals, there is a mandatory change of the ball at the start of the 35th over of each innings. The replacement will be a clean used ball, not a new ball. This rule was introduced in June 2007[2]
The ball is not replaced if it is hit into the crowd - the crowd must return it. If the ball is damaged, lost, or illegally modified, it will be replaced by a used ball in similar condition to the replaced ball. A new ball can only be used after the specified minimum number of overs have been bowled with the old one.

Because a single ball is used for an extended period of play, its surface wears down and becomes rough. The bowlers will polish it whenever they can - usually by rubbing it on their trousers, producing the characteristic red stain that can often be seen there. However, they will usually only polish one side of the ball, in order to create 'swing' as it travels through the air. They may apply natural substances (i.e. saliva or sweat) to the ball as they polish it.

The seam of a cricket ball can also be used to produce different trajectories through the air, with the technique known as swing bowling, or to produce sideways movement as it bounces off the pitch, with the technique known as seam bowling.

Since the condition of the cricket ball is crucial to the amount of movement through the air a bowler can produce, the laws governing what players may and may not do to the ball are specific and rigorously enforced. The umpires will inspect the ball frequently during a match. It is illegal for a player to:

rub any substance apart from saliva or sweat onto the ball
rub the ball on the ground
scuff the ball with any rough object, including the fingernails
pick at or lift the seam of the ball.
Despite these rules, it can be tempting for players to gain an advantage by breaking them. There have been a handful of incidents of so-called ball tampering at the highest levels of cricket, involving players such as Pakistani fast bowler Waqar Younis and former England captain Mike Atherton.

A new cricket ball is harder than a worn one, and is preferred by fast bowlers because of the speed and bounce of the ball as it bounces off the pitch. Older balls tend to spin more as the roughness grips the pitch more when the ball bounces, so spin bowlers prefer to use a worn ball. Uneven wear on older balls may also make reverse swing possible. A captain may delay the request for a new ball if he prefers to have his spin bowlers operating, but usually asks for the new ball soon after it becomes available.


[edit] Dangers of cricket balls
Cricket balls are notoriously hard and potentially lethal, hence today's batsmen and close fielders often wear protective headgear. Raman Lamba was killed when hit on the head while fielding at forward short leg in a club match in Bangladesh. Only two other cricketers are known to have died as a result of on-field injuries in a first-class fixture. Both were hit while batting: George Summers of Nottinghamshire on the head at Lord's in 1870; and Abdul Aziz, the Karachi wicket-keeper, over the heart in the 1958-59 Quaid-e-Azam final. Ian Folley of Lancashire, playing for Whitehaven in 1993, died after being hit, and in 1995 a batsman was killed in a match in Vancouver, Canada, when hit on the head ducking under a bouncer.

Frederick, Prince of Wales is often said to have died of complications after being hit by a cricket ball, although in reality this is not true - although he was hit in the head by one, the real cause of his death was a burst abscess in a lung. Glamorgan player Roger Davis was almost killed by a ball in 1971 when he was hit on the head while fielding.

Numerous injuries are reported to health institutions, worldwide, in relation to cricket ball injuries including: occular (with some players having even lost eyes), cranial (head), digital (fingers and toes) and testicular.


[edit] Cricket ball swing
The key to making a cricket ball swing is to cause a pressure difference between the two sides of the ball. The air pressure depends on the flow of air over each side of the ball. Swing is generated when bowlers, by accident or design, disrupt the flow of air over one side of the ball.

Normal swing is achieved by keeping one side of the ball polished smooth and shiny, and delivering the ball with the polished side forward, and the seam angled in the direction of desired swing. The outswinging delivery moves away from the right-handed batsman, while the inswinger moves in towards him. Normal swing is achieved by maintaining laminar boundary layer air-flow on the shiny side whilst creating turbulent flow on the seam side. These deliveries, particularly the outswinger, are the bread and butter of opening bowlers who get to use the ball while it is still new.

Reverse swing is very different from conventional swing. Although the seam is oriented in the same way as for an outswinger and the action is the same, the rough side of the ball is to the fore, and the ball moves in to the batsman like an inswinger. Reverse swing is achieved when the ball is bowled very fast. In this case the air flow will become turbulent on both sides before it reaches the seam.

Alternatives to cricket balls
Sometimes alternatives to a real cricket ball may be preferred for reasons of safety, practice, availability and cost. Examples include a tennis ball (most favoured) or a plastic version of the cricket ball, known as an Incrediball.

Many casual players use a tennis ball wrapped in layers of some type of adhesive tape (often electrical tape), which makes the relatively soft tennis ball harder and smoother. This is commonly referred to as a tape ball. A common variant is to tape only half the tennis ball, to provide two different sides and make it easy to bowl with prodigious amounts of swing.

Diamond cricket ball

The world's first diamond cricket ball was made in Sri Lanka with 2704 diamonds and 18 carat (75%) gold for the seam. The material used to keep the diamonds on the ball is similar to the one used on the wings of NASA space shuttles.[3]