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The boat enters the lock. 8–9. The boat enters the lock. 3. The lower gates are closed. 10. The upper gates are closed. 4–5. The lock is filled with water from upstream. 11–12. The lock is emptied by draining its water downstream. 6. The upper gates are opened. 13. The lower gates are opened. 7. The boat exits the lock. 14. The boat exits ...
Operation of caisson lock Contemporary engraving of the lock at Combe Hay. The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for ...
Ship caisson at Droogdok Jan Blanken at Hellevoetsluis. A caisson is a form of lock gate.It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to float it and allow it to be towed clear of the dock.
The Weitzel Lock, was built between 1873 and 1881 directly south of the State Lock, and was the first lock to be operated by the federal government. At 515 ft (157 m) long, 80 ft (24 m) wide, and 17 ft (5.2 m) deep, it was the longest lock in the world upon its completion.
Air lock diving-bell plant – Underwater work support barge used at Gibraltar, a mobile barge-mounted engineering caisson used in the Port of Gibraltar Cofferdam – Barrier allowing liquid to be pumped out of an enclosed area, a temporary water-excluding structure built in place, sometimes surrounding a working area as does an open caisson.
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Entrance to the South Locks from sea. Being the oldest locks in the complex, they are now the main passage for recreational vessels and smaller inland ships. There are four locks, of various sizes at the North Sea mouth of the canal: [ 3 ] When the north canal lock was opened in 1929 it was the largest canal lock in the world.
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