(under subclass 53) Devices between which a vessel is raised by their buoyant action, the structures not being designed to be sunk (, below). The camels, caissons, or pontoons are partially submerged by opening watervalves and the vessels secured by straps, chains, etc., and by changing the buoyancy of the structures by expelling water from tanks or on rise of tide the vessel is raised.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53, for similar structures designed to be sunk and secured to sunken or submerged vessels.
