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Wrist spin is a type of bowling in the sport of cricket. It refers to the cricket technique and specific hand movements associated with imparting a particular direction of spin to the cricket ball. The other spinning technique, usually used to spin the ball in the opposite direction, is finger spin. Wrist spin is bowled by releasing the ball from the back of the hand, so that it passes over the little finger. Done by a right-handed bowler, this imparts an anticlockwise rotation to the ball, as seen from the bowler's perspective; a left-handed wrist spinner rotates the ball clockwise. The name ''wrist spin'' is actually something of a misnomer, as the wrist is not a vital part of the mechanism for producing the characteristic spin on the ball. A wrist spin delivery is released with the arm held in a fully pronated position, with the fingers on the inside of the ball (to the left for a right-handed bowler). If this pronated position is maintained through the release, the fingers will naturally cut down the side of the ball and produce an anti-clockwise spin. The great Australian leg-spinner Bill O'Reilly is famous for bowling legspin in this manner.〔Brian Wilkins, "The Bowler's Art"〕 Additional spin many be put on the ball through two other means: the active pronation of the arm from an initially supinated position just before the ball is released, and the extension of the wrist at the moment of release. Both techniques increase the effect of the ''cutting'' mechanism. The slower a spin bowler delivers the ball, the more actively he must attempt to impart spin onto it in order to maintain the same rate of revolution.〔Brian Wilkins, "The Bowler's Art"〕 Although the biomechanical details of wrist spin are the same for right and left handed bowlers, such bowlers are often discussed separately, as the direction in which the ball deviates as it bounces on the cricket pitch is different: *Right-handed wrist spin is more commonly known as leg spin. *Left-handed wrist spin is more commonly known as left-arm unorthodox spin or left-arm chinaman. ==Types of Delivery== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wrist spin」の詳細全文を読む スポンサード リンク
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