isophase light
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Isophase light — An isophase light is a rhythmic light in which all durations of light and darkness are equal. It is normally used in light signals in lighthouses. Different lighthouses have different frequencies and not all are isophase and mariners can find out … Wikipedia
Light characteristic — Symbols and abbreviations for light characteristics A light characteristic is a graphic and text description of a navigational light sequence or colour displayed on a nautical chart or in a Light List with the chart symbol for a lighthouse,… … Wikipedia
Flashing light — A flashing light is a rhythmic light in which the total duration of the light in each period is clearly shorter than the total duration of the darkness and in which the flashes of light are all of equal duration. (Commonly used for a single… … Wikipedia
Occulting light — An occulting light is a rhythmic light in which the total duration of light in each period is clearly longer than the total duration of darkness and in which the intervals of darkness (occultations) are all of equal duration. [cite web title =… … Wikipedia
Presque Isle Light — Infobox Lighthouse location = Presque Isle, Erie, PA coordinates coor dms|42|09|48.31|N|80|06|55.68|W|region:US type:landmark yearbuilt = 1872 yearlit = 1873 automated = Yes foundation = Limestone construction = Brick marking = Solid white shape … Wikipedia
Cape Neddick Light — Cape Neddick Lighthouse Location Cape Neddick, Maine Year first constructed 1879 Automated 1987 Foundation Concrete Construction Cast iron plate with brick lining … Wikipedia
Kenosha North Pier Light — Infobox Lighthouse caption = Kenosha North Pier Lighthouse location = Wisconsin coordinates = coord|42|35|19.8|N|87|48|31.1|W|region:US type:landmark yearlit = 1906 automated = yeardeactivated = foundation = Concrete pier construction = Cast iron … Wikipedia
Alki Point Light — Infobox Lighthouse caption = location = West Seattle, Washington coordinates = coord|47|34|35|N|122|25|14|W|region:US type:landmark yearlit = 1913 automated = 1984 yeardeactivated = foundation = Concrete construction = Masonry shape = White… … Wikipedia
Algoma Pierhead Light — Infobox Lighthouse caption = location = Algoma, Wisconsin coordinates = coord|44|36|25|N|87|25|46|W|region:US type:landmark yearlit = 1932 automated = 1973 yeardeactivated = foundation = Pier construction = Steel shape = Red cylindrical tower… … Wikipedia
Manitowoc Breakwater Light — Manitowoc Breakwater Lighthouse Location Manitowoc, Wisconsin Coordinates … Wikipedia
