Flashing (Optical) Apparatus

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An optical apparatus which produces an intermittent light.

Note 1: An intermittent light may be produced by several methods, e.g.

  • a. by an optical system producing pencil beams which revolve about a vertical axis.
  • b. by alternately lighting and extinguishing the luminous source. (2-4-100)
  • c. by intermittently placing an opaque screen in the path of the light. (2-4-110, 2-4-115, 2-4-120)

Note 2: A "flashing (optical) apparatus" may produce any intermittent light character. The French term Appareil a Eclats is, however, restricted to apparatus producing a flashing light character. (2-5-145)

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

acceleration due to gravity (m/s2)

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