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They must be hollow and made of metal (usually steel) with a diameter between 70.5 and 80 mm (2.78 and 3.15 in) and a weight between 650 and 800 g (23 and 28 oz). When purchasing competition boules, a purchaser has a choice of a number of characteristics, including the size, weight, and hardness of the boules, as well as the striations ...
games where the balls are hollow and made out of metal, typically steel or bronze (for example, pétanque, bocce volo) games where the balls are stuffed and made out of leather or some similar soft material (boccia, "soft pétanque") Alternatively, boules games may be subdivided into categories based on the shape of the ball:
Baoding balls can also be made of solid jade, agate, marble, and other types of stone. [3] Hollow balls are generally more suitable for therapeutic use due to their lighter weight. Heavier balls of iron, steel or tungsten carbide require more effort for rotation.
A ball mill consists of a hollow cylindrical shell rotating about its axis. The axis of the shell may be either horizontal or at a small angle to the horizontal. It is partially filled with balls. The grinding media are the balls, which may be made of steel (chrome steel), stainless steel, ceramic, or rubber.
Racquetball is a racquet sport and a team sport played with a hollow rubber ball on an indoor or outdoor court. Joseph Sobek [ 1 ] invented the modern sport of racquetball in 1950, [ 2 ] adding a stringed racquet to paddleball in order to increase velocity and control.
The Minié ball is a cylindro-conoidal bullet with grease-filled cannelures on its exterior and a cone-shaped hollow in its base.Minié designed the bullet with a small iron plug, and lead skirting that would expand under the pressure of gunpowder deflagration causing the bullet to obturate, and grip the rifling grooves.
On March 27, 1974, the Betz family investigated a small brush fire near their residence in Fort George Island, Florida. [3] [4] The family of three, Antoine, Jerri, and son Terry, came across a small metal sphere the size of a bowling ball.
A wrecking ball is a heavy steel ball suspended from a crane that is used for demolition work. Wrecking ball may also refer to: Music. Albums. Wrecking ...
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