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An interval of darkness between appearances of a light. (Fig. 40b)

Ch2 Fig40.jpg

Note: In Britain and in France this term is properly applied only to an interval of dark-ness between flashes of shorter duration.

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