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  2. Lock (water navigation) - Wikipedia

    en.wikipedia.org/wiki/Lock_(water_navigation)

    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 ...

  3. Caisson (lock gate) - Wikipedia

    en.wikipedia.org/wiki/Caisson_(lock_gate)

    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.

  4. Caisson lock - Wikipedia

    en.wikipedia.org/wiki/Caisson_lock

    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 ...

  5. St. Lawrence Seaway - Wikipedia

    en.wikipedia.org/wiki/St._Lawrence_Seaway

    The Eisenhower Locks in Massena, New York St. Lawrence Seaway St. Lawrence Seaway separated navigation channel near Montreal. The St. Lawrence Seaway (French: la Voie Maritime du Saint-Laurent) is a system of locks, canals, and channels in Canada and the United States that permits oceangoing vessels to travel from the Atlantic Ocean to the Great Lakes of North America, as far inland as Duluth ...

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  7. Bow visor - Wikipedia

    en.wikipedia.org/wiki/Bow_visor

    These doors are an upper extension of the collision bulkhead and act as a secondary barrier against water entering the car deck, should the primary bow door(s) fail. There have been several recorded incidents in which bow visors have partially opened whilst the ship is in motion, resulting in some ships having to have their visor locking ...

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