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Sunk′en Ves′sels, Rais′ing.

Apparatus for lifting foundered vessels.

Sowesbutt's apparatus for raising sunken vessels consists of a number of cases, made just sufficiently heavy to sink when filled with water; each contains a metallic receiver filled with compressed air. They are lowered from the wrecking vessel and attached along the sides of the ship by divers; when the arrangements are complete, valves in the receivers are opened, either by the divers or by self-acting mechanism, and the compressed air thus liberated expels the water from the pontons, which buoy up the vessel. See also Figs. 1617, 4148.

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