Rotating Optic

From International Dictionary of Marine Aids to Navigation
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Alternative term: Revolving Optic

An assembly of one or more optical panels revolving about a vertical axis, and intended to produce a flashing light by Method a. of Note 1: to 2-2-180.

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

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