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An example of a complete light characteristic is "Gp Oc(3) W 10s 15m 10M". This indicates that the light is a group occulting light in which a group of three eclipses repeat every 10 seconds; the light is white; the light is 15 metres above the chart datum and the nominal range is 10 nautical miles.
The Cap-des-Rosiers Lighthouse is the tallest lighthouse in Canada, standing 34.1 metres (112 ft) tall. It is situated on the south shore of the Saint Lawrence River at the top of a steep cliff. It is located at the mouth of the river, where it flows into the Gulf of St. Lawrence. It is open for tours in the summer season.
The mechanism for eclipsing the light had been transferred to the High Light from the old lighthouse, [14] which had latterly displayed a similar intermittent light. [15] In 1884 the High light was upgraded and its occulting characteristic was altered to two two-second eclipses every minute. [16]
The light was automated in 1979. [2] [11] Today, the lighthouse displays an occulting red light with a four-second period, having a nominal range of 12 nautical miles. [4] During the navigation season that runs from April 1 to November 1, the fog signal sounds a two-second blast every fifteen seconds. [4] [12]
The lighthouse at Fourteen Foot Shoal was named to note that the lake is only 14 feet (4.3 m) deep at this point, which is a hazard to navigation, ships and mariners.. This light is located at the northern end of Lake Huron, Michigan, US, where it is necessary for boats heading to Chicago to pass through a narrow strait and still avoid shallow water.
Long Point Light Station is a historic lighthouse at the northeast tip of Long Point in Provincetown, Massachusetts. [3] As a navigational aid , it marks the southwest edge of the entrance to Provincetown Harbor .
It is one of four black lighthouses in the world, and the only one in the Southern Hemisphere. Together with the nearby white Queenscliff Low Light, it was built in 1862 to replace the former sandstone lighthouse of 1843 on the same site which was underpowered and deteriorating. [1] The lightsource is located 40 metres above sea level (focal ...
Both lights were given an occulting characteristic, the Low light occulting every 2.5 seconds, the High light every 5 seconds. [14] In each location the lamp was set within a sectional fixed optic, backed by a dioptric mirror. [15]
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