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2. Caisson lock - Wikipedia

   en.wikipedia.org/wiki/Caisson_lock

   Caisson lock. 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 water when conventional locks were used to raise and lower ...

3. Caisson (engineering) - Wikipedia

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

   Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.

4. Stanchion - Wikipedia

   en.wikipedia.org/wiki/Stanchion

   In yachting, metal bars that hold the life-lines around a boat's perimeter. In river rafting, metal bars that hold the yokes for oars. In ice hockey, the posts used on the dasher boards to hold panes of glass in place. This is a common vernacular term in the sport, although in the industry they are simply called posts.

5. Lock (water navigation) - Wikipedia

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

   The exit gates are opened and the boat moves out. [11] If the lock were empty, the boat would have had to wait 5 to 10 minutes while the lock was filled. For a boat travelling upstream, the process is reversed; the boat enters the empty lock, and then the chamber is filled by opening a valve that allows water to enter the chamber from the upper ...

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7. Stuffing box - Wikipedia

   en.wikipedia.org/wiki/Stuffing_box

   Boats. A small boat stuffing box comprising an adjusting nut, a locking nut and a sleeve. On a boat having an inboard motor that turns a shaft attached to an external propeller, the shaft passes through a stuffing box, also called a "packing box" or "stern gland" in this application. The stuffing box prevents water from entering the boat's hull.