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The Penrose triangle, also known as the Penrose tribar, the impossible tribar, [1] or the impossible triangle, [2] is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing. It cannot exist as a solid object in ordinary three-dimensional Euclidean space, although its surface ...
A water tower is an elevated structure [1] supporting a water tank constructed at a height sufficient to pressurize a distribution system for potable water, and to provide emergency storage for fire protection. [2] Water towers often operate in conjunction with underground or surface service reservoirs, which store treated water close to where ...
Roger Penrose. Sir Roger Penrose, OM, FRS, HonFInstP (born 8 August 1931) [1] is a British mathematician, mathematical physicist, philosopher of science and Nobel Laureate in Physics. [2] He is Emeritus Rouse Ball Professor of Mathematics in the University of Oxford, an emeritus fellow of Wadham College, Oxford, and an honorary fellow of St ...
Lifeboats 13 and 15 also safely reached the water, overloaded with around 150 people. Finally, Lifeboat 21 (52 people on board) reached the water safely and cleared the ship moments before her final plunge. A few of her collapsible lifeboats washed off her decks as she sank and provided flotation for some survivors.
Lionel Corporation was an American toy manufacturer and holding company of retailers that was founded in 1900 and operated for more than 120 years. It started as an electrical novelties company. Lionel specialized in various products throughout its existence. Toy trains and model railroads were its main claim to fame. [1]
A view of the International Concourse E and control tower at night. Along with the fifth runway, a new control tower was built to see the entire runway length. The new control tower is the tallest in the United States, over 398 feet (121 m) tall. The old control tower, at 231 ft, was demolished in August 2006. [36]
USS Pennsylvania (BB-38) was the lead ship of the Pennsylvania class of super-dreadnought battleships built for the United States Navy in the 1910s. The Pennsylvanias were part of the standard-type battleship series, and marked an incremental improvement over the preceding Nevada class, carrying an extra pair of 14-inch (356 mm) guns for a total of twelve guns.
The building was equipped with a sprinkler system, but had many single-point vulnerabilities for failure: the sprinkler system required manual initiation of the electrical fire pumps, rather than being a fully automatic system; the floor-level controls had a single connection to the sprinkler water riser; and the sprinkler system required some ...