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  2. Ship ballast - Wikipedia

    en.wikipedia.org/wiki/Ship_ballast

    The advantage of water ballast is that the tanks can be emptied, reducing draft or the weight of the boat (e.g. for transport on ground) and water added back in (in small boats, simply by opening up the valves and letting the water flow in) after the boat is launched or cargo unloaded.

  3. Parbuckle salvage - Wikipedia

    en.wikipedia.org/wiki/Parbuckle_salvage

    Parbuckle salvage. The capsized battleship USS Oklahoma is rotated upright while under salvage at Pearl Harbor, Hawaii, 8 March 1943. The ship is in the 130-degree position, with its bow on the left and the starboard deck edge just rising from the water. Parbuckle salvage, or parbuckling, is the righting of a sunken vessel using rotational ...

  4. Ballast tank - Wikipedia

    en.wikipedia.org/wiki/Ballast_tank

    Ballast tank. Cross section of a vessel with a single ballast tank at the bottom. A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more ...

  5. Landing craft tank - Wikipedia

    en.wikipedia.org/wiki/Landing_craft_tank

    Landing craft tank. A Crusader Mk I cruiser tank driving off the tank landing craft TLC-124 during tests of a portable concrete roadway 26 April 1942. The Landing Craft, Tank (LCT) (or tank landing craft, TLC) [1][2] was an amphibious assault craft for landing tanks on beachheads. They were initially developed by the Royal Navy and later by the ...

  6. Fusible plug - Wikipedia

    en.wikipedia.org/wiki/Fusible_plug

    Fusible plug. A fusible plug is a threaded cylinder of metal, usually bronze, brass or gunmetal, with a tapered hole drilled completely through its length. This hole is sealed with a metal of low melting point that flows away if a predetermined high temperature is reached. The initial use of the fusible plug was as a safety precaution against ...

  7. Submersible - Wikipedia

    en.wikipedia.org/wiki/Submersible

    Submersible. Retired modern submersible Star III of Scripps Institution of Oceanography. A submersible is an underwater vehicle which needs to be transported and supported by a larger watercraft or platform. This distinguishes submersibles from submarines, which are self-supporting and capable of prolonged independent operation at sea.

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