Revolving Screen

From International Dictionary of Marine Aids to Navigation
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2-4-120

An opaque screen, usually of cylindrical form with apertures revolving about a vertical axis in such a way as to interrupt the light from a luminous source in an optic, and so to produce a desired rhythmic light.

Ch2 Fig37.jpg




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