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The Ordnance QF 20 pounder (known as 20 pounder, 20 pdr or simply 20-pr) was a British 84 mm (3.307 inch) tank gun. [ 1 ] [ i ] It was introduced in 1948 and used in the Centurion main battle tank, Charioteer medium tank, and Caernarvon Mark II heavy tank.
The medium tank T20, medium tank T22 and medium tank T23 were prototype medium tanks, developed by the United States Army during World War II. They were designed as successors to the M4 Sherman . The standard main weapon for production versions of these designs was to be the 76 mm gun M1 .
A new specification, A22, was drawn up and Vauxhall who had been engaged to find a suitable power plant - their Bedford "twin six" engine - for the A20 were instructed to bring a tank based on the A20 into production as soon as possible. This would enter service as "Tank, Infantry, Mark IV" later named Churchill. The first pilot Churchill was ...
A regular skew hexagon seen as edges (black) of a triangular antiprism, symmetry D 3d, [2 +,6], (2*3), order 12. A skew hexagon is a skew polygon with six vertices and edges but not existing on the same plane. The interior of such a hexagon is not generally defined. A skew zig-zag hexagon has vertices alternating between two parallel planes.
A 1,200,000-litre (320,000 US gal; 260,000 imp gal) aquarium at Monterey Bay Aquarium in California, displaying a kelp forest ecosystem. An aquarium can range from a small glass bowl containing less than 1 litre (2.1 US pt) of water to immense public aquaria that house entire ecosystems such as kelp forests.
The regular icositetragon is represented by Schläfli symbol {24} and can also be constructed as a truncated dodecagon, t{12}, or a twice-truncated hexagon, tt{6}, or thrice-truncated triangle, ttt{3}.
Alternately it can be seen as the Cartesian product of a regular hexagon and a line segment, and represented by the product {6}×{}. The dual of a hexagonal prism is a hexagonal bipyramid. The symmetry group of a right hexagonal prism is D 6h of order 24. The rotation group is D 6 of order 12.
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