flap gate

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Panama Canal infographic

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King Cobra snake in Malaysia. (reptile)

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Srinivasa Ramanujan, Indian mathematician and autodidact.

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Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)

6 Cultures That Recognize More than Two Genders

flap gate

engineering

Also known as: box gate

Learn about this topic in these articles:

use in dry docks

In harbours and sea works: Entrances
…the sliding caisson and the flap gate, or box gate, are perhaps the most popular. The sliding caisson is usually housed in a recess, or camber, at the side of the entrance and can be drawn aside or hauled across with winch and wire rope gear to open and close…
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