Derrick hoist

From International Dictionary of Marine Aids to Navigation
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8-3-055

Alternative terms(s) : Cargo purchase, main purchase (USA)

The main arrangement of blocks and ropes for hoisting and lowering weights, such as buoys, sinkers, etc.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

second

United States of America

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM