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Most Baoding balls consist of a pair of hollow spheres, each containing a chime that rings when an inner ball strikes the outer sphere. Many modern examples are decorated with cloisonné and brass wire; these are essentially decorative since they easily chip when dropped or rubbed together. Baoding balls can also be made of solid jade, agate ...
The sculpture consists of a hollow dome formed from several hundred spheres of polished 316L stainless steel, arranged to resemble the talus formations previously present on the site, prior to the construction of Quesnell Bridge. [1] The spheres have been polished to a mirror sheen, resulting in the sculpture reflecting the environment around it.
A Klerksdorp sphere. It is 3 to 4 centimetres (1.2 to 1.6 in) in maximum diameter and 2.5 centimetres (0.98 in) in thickness. Klerksdorp spheres are small objects, often spherical to disc-shaped, that have been collected by miners and rockhounds from 3-billion-year-old pyrophyllite deposits mined by Wonderstone Ltd., near Ottosdal, South Africa.
A puzzle ball on display at the Overseas Museum, Bremen. A Chinese puzzle ball, sometimes known as a devil's work ball (Chinese: 鬼工球; pinyin: guǐ gōng qiú) or the Concentric Ball (Chinese: 同心球; pinyin: tóng xīn qiú), is a Chinese-made artifact that consists of a number of intricately carved concentric hollow spheres carved from a single solid block that fit within one another ...
[3] [4] The family of three, Antoine, Jerri, and son Terry, came across a small metal sphere the size of a bowling ball. Their first thought was the sphere had been a cannonball left from New World conquistadors. They decided to take the sphere back to their house. [2] Several days later, Terry was playing the guitar in their home.
A simple Van de Graaff generator consists of a belt of rubber (or a similar flexible dielectric material) moving over two rollers of differing material, one of which is surrounded by a hollow metal sphere. A comb-shaped metal electrode with sharp points (2 and 7 in the diagram), is positioned near each roller. The upper comb (2) is connected to ...
Shaped stone balls from Qesem Cave, c. 420,000–200,000 years old.. Shaped stone balls are found at Palaeolithic sites across Africa, Asia, and Europe, associated with Oldowan (c. 2.6 million – 1.7 million years old), Acheulean (c. 1.76 million – 130,000 years old), and African Middle Stone Age (c. 280,000–50,000 years old) stone tool industries.
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.
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