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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. Their first thought was the sphere had been a cannonball left from New World conquistadors. They decided ...
The experiment uses a conductive metal container A open at the top, insulated from the ground. Faraday employed a 7 in. diameter by 10.5 in. tall pewter pail on a wooden stool,(B) [1] but modern demonstrations often use a hollow metal sphere with a hole in the top, [10] or a cylinder of metal screen, [9] [12] mounted on an insulating stand. Its ...
A fine metal chain from a neutron-absorbing material (the same used for reactor control rods, e.g. cadmium), can be used instead. The W47 warhead had its pit filled with a cadmium-boron wire when it was manufactured; on arming the weapon, the wire was pulled out to a spool by a small motor and could not be reinserted. However, the wire tended ...
NASA's Curiosity rover has been exploring the surface of Mars since 2012, and it recently came upon a rather puzzling find. While scouring Mars' Mount Sharp earlier this week, the rover stumbled ...
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 ...
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 Roman dodecahedron or Gallo-Roman dodecahedron [1] [2] is a small hollow object made of copper alloy which has been cast into a regular dodecahedral shape with twelve flat pentagonal faces. Each face has a circular hole of varying diameter in the middle, the holes connecting to the hollow center, and each corner has a protruding knob. [1]
Hollow spheres of other materials create syntactic foams with different properties: ceramic balloons e.g. can make a light syntactic aluminium foam. [3] Hollow spheres also have uses ranging from storage and slow release of pharmaceuticals and radioactive tracers to research in controlled storage and release of hydrogen. [4]
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