View source for Flashing (Optical) Apparatus


'''2-2-180

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)


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[[Category:2.2 Optical Apparatus]]
[[Category:Alphabetical Index]]
[[Category:IALA Dictionary 1970-89 Edition]]