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USE OF MAGNETS IN MARINE SALVAGE.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
A study was made for the Supervisor of Salvage, Naval Ships Systems Command, to determine the usefulness of magnets in underwater applications. A literature search indicates that large electromagnets are useful for salvaging ferrous cargoes in shallow water. They are of little value in deep water salvage because of the low payload-to-weight ratio and the difficulty of positioning an electromagnet at the end of a long line. Tests of 6- to 8-pound permanent magnets on a ships hull showed they had underwater holding forces of 40 to 100 pounds. These values indicate such magnets are useful for securing divers and tools to underwater ferrous objects. Author
Technical rept. Jul 66-Jun 67,