Cut-off screen

From International Dictionary of Marine Aids to Navigation
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No English Term

An opaque screen covering part of a lantern, or placed outside the lantern, so as to provide a sharp cut-off to a beam in a sector light and to reduce the angle of uncertainty.

Note: This is a particular form of "cut screen".

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

Number of cells

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