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2. Tainter gate - Wikipedia

   en.wikipedia.org/wiki/Tainter_gate

   Pressure forces on a submerged body act perpendicular to the body's surface. The design of the Tainter gate results in every pressure force acting through the centre of the imaginary circle of which the gate is a section, so that all resulting pressure force acts through the pivot point of the gate, making construction and design easier.

3. Quantum logic gate - Wikipedia

   en.wikipedia.org/wiki/Quantum_logic_gate

   Common quantum logic gates by name (including abbreviation), circuit form(s) and the corresponding unitary matrices. In quantum computing and specifically the quantum circuit model of computation, a quantum logic gate (or simply quantum gate) is a basic quantum circuit operating on a small number of qubits.

4. Rod (unit) - Wikipedia

   en.wikipedia.org/wiki/Rod_(unit)

   The rod is useful as a unit of length because integer multiples of it can form one acre of square measure (area). The 'perfect acre' [2] is a rectangular area of 43,560 square feet, bounded by sides 660 feet (a furlong) long and 66 feet (a chain) wide (220 yards by 22 yards) or, equivalently, 40 rods by 4 rods. An acre is therefore 160 square ...

5. Zhonghua Gate, Nanjing - Wikipedia

   en.wikipedia.org/wiki/Zhonghua_Gate,_Nanjing

   The gate was made of huge strip stones 0.8 – 1.39 m long, 0.7 m wide and 0.26-0.35 thick and large Chinese brick 0.4 m long 0.2 m wide and 0.1 m thick. Its dimensions were 118.5 m from east to west, and 128 m from south to north. The ramparts were 20.45 m high. The total area enclosed was 15,168 square meters.

6. Bill Gates's house - Wikipedia

   en.wikipedia.org/wiki/Bill_Gates's_house

   Bill Gates designed and owns a mansion that is on Lake Washington in Medina, Washington.The 66,000-square-foot (6,100 m 2) mansion [1] incorporates technology in its design. [specify] [2] In 2009, property taxes were reported to be US$1.063 million on a total assessed value of US$147.5 million.

7. Thames Barrier - Wikipedia

   en.wikipedia.org/wiki/Thames_Barrier

   The gates are filled with water when submerged and empty as they emerge from the river. The four large central gates are 20.1 metres (66 ft) high and weigh 3,700 tonnes each. [13] Four radial gates by the river banks, also about 30 metres (100 ft) wide, can be lowered. These gate openings, unlike the main six, are non-navigable. [citation needed]