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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 Magdeburg hemispheres are a pair of large copper hemispheres with mating rims that were used in a famous 1654 experiment to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart by teams of horses. Once the valve was opened ...
Three prehistoric Scottish carved stone balls, in Kelvingrove Art Gallery and Museum, Glasgow. In archaeology, a stone ball or petrosphere (from Greek πÎτρα (petra), "stone", and σφαá¿–ρα (sphaira), "ball") is the name for any spherical man-made object of any size that is composed of stone.
Carved stone balls are petrospheres dated from the late Neolithic, to possibly as late as the Iron Age, mainly found in Scotland, but also elsewhere in Britain and Ireland. They are usually round and rarely oval, and of fairly uniform size at around 2 + 3 ⁄ 4 inches or 7 cm across, with anything between 3 and 160 protruding knobs on the surface.
Syntactic foam, shown by scanning electron microscopy, consisting of glass microspheres within a matrix of epoxy resin.. Syntactic foams are composite materials synthesized by filling a metal, polymer, [1] cementitious or ceramic matrix with hollow spheres called microballoons [2] or cenospheres or non-hollow spheres (e.g. perlite) as aggregates.
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