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2. Roller dam - Wikipedia

   en.wikipedia.org/wiki/Roller_dam

   Roller gates of Mississippi River Lock and Dam No. 15, the largest roller dam in the world. Roller dams are a type of weir, or a dam that is designed to allow water to flow over the top in continuous action. They are used on rivers or other such moving bodies of water where erosion damage is undesirable, yet likely to occur.

3. Floodgate - Wikipedia

   en.wikipedia.org/wiki/Floodgate

   Drum gates are hollow gate sections that float on water. They are pinned to rotate up or down. Water is allowed into or out of the flotation chamber to adjust the dam's crest height. Drum gates are controlled with valves. Drum gates on a diversion dam: Roller gates are large cylinders that move in an angled slot. They are hoisted with a chain ...

4. Roller coaster wheel assembly - Wikipedia

   en.wikipedia.org/wiki/Roller_coaster_wheel_assembly

   Most modern roller coasters typically have pairs of wheels in each orientation, with 6 wheels per assembly, but this can vary by ride. The up-stop system was developed in 1919 by John A. Miller . He patented a design to make Pleasure-Railway attractions safer.

5. Tainter gate - Wikipedia

   en.wikipedia.org/wiki/Tainter_gate

   The Tainter gate is used in water control dams and locks worldwide. The Upper Mississippi River basin alone has 321 Tainter gates, and the Columbia River basin has 195. A Tainter gate is also used to divert the flow of water to San Fernando Power Plant on the Los Angeles Aqueduct. [1] Tainter gate at McAlpine Dam, Ohio River, Louisville, Kentucky

6. Launched roller coaster - Wikipedia

   en.wikipedia.org/wiki/Launched_roller_coaster

   The launched roller coaster is a type of roller coaster that initiates a ride with high amounts of acceleration via one or a series of linear induction motors (LIM), linear synchronous motors (LSM), catapults, tires, chains, or other mechanisms employing hydraulic or pneumatic power, along a launch track. This mode of acceleration powers many ...

7. Cointet-element - Wikipedia

   en.wikipedia.org/wiki/Cointet-element

   A Cointet-element on a beach, rigged with explosive "sausages" by an American Underwater Demolition Team. Cointet-element at Collevill-sur-Mer. The Cointet-element, also known as a Belgian Gate or C-element, was a heavy steel fence about three metres (9 ft 10 in) wide and two metres (6 ft 7 in) high, typically mounted on concrete rollers, used as a mobile anti-tank obstacle during World War II ...