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2. Bar gate - Wikipedia

   en.wikipedia.org/wiki/Bar_gate

   Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. [7] Bar gates are frequently paired end to end or closely offset to block traffic in both directions. Some bar gates also have a second arm which hangs 30 to 40 cm below the upper arm when lowered to increase approach visibility.

3. Portcullis - Wikipedia

   en.wikipedia.org/wiki/Portcullis

   A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.

4. Catenary arch - Wikipedia

   en.wikipedia.org/wiki/Catenary_arch

   Architecturally, a catenary arch has the ability to withstand the weight of the material from which it is constructed, without collapsing. [4] [5] For an arch of uniform density and thickness, supporting only its own weight, the catenary is the ideal curve.

5. Panama Canal locks - Wikipedia

   en.wikipedia.org/wiki/Panama_Canal_locks

   The heaviest leaves weigh 662 t (730 short tons; 652 long tons); the hinges themselves each weigh 16.7 t (36,817 lb). Each gate has two leaves, 65 ft (19.81 m) wide, which close to a "V" shape with the point upstream. This arrangement has the effect that the force of water from the higher side pushes the ends of the gates together firmly.

6. I-beam - Wikipedia

   en.wikipedia.org/wiki/I-beam

   The designation for each is given as the approximate height of the beam, the type (beam or column) and then the unit metre rate (e.g., a 460UB67.1 is an approximately 460 mm (18.1 in) deep universal beam that weighs 67.1 kg/m (135 lb/yd)). [6]

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   November 16, 2024 at 7:15 PM. ... Michael served as a White House fellow, working in the Department of Defense as a special assistant to Robert Gates, from 2009 to 2011, and oversaw projects in ...