Bosun's chair

From International Dictionary of Marine Aids to Navigation
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A lightly built seat suspended from a cable with tackle attached to permit access to the exterior faces of structures for painting or other maintenance work.

Note: A similar system can be employed for the transfer of personnel or material between a vessel and an otherwise inaccessible lighthouse.

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