Lighthouses

Ah earthquakes in 1303 and another in 1323 are believed to have contributed to the collapse of the Lighthouse of Alexandria, or Pharos.

Lighthouses use beams of light projected through a special lens called a Fresnel lens. Invented by a Frenchman in the early 1800s, the Fresnel lens concentrates beams of light through a prismatic lens which captures and concentrates them, so the light can be seen for many kilometres out at sea. The lens design uses a system of concentric glass rings to concentrate the light. This design is still used today in car headlights and traffic lights. Modern lighthouses have a system of rotating lenses, and newer lighthouses conserve energy by flashing the light on and off.

• Popular folklore says that the island got its name because of the many bodies that were found around it, washed up from shipwrecks
• The inside plaque reads "Body Island" - no one is certain on the spelling change
• Bodie Lighthouse stands 156 feet tall
• The height of each stripe is 22 feet
• It has 214 stairs to the lantern
• The beacon is visible up to 19 miles
• It currently has One 1000 watt lightbulb activated by photocell
• The land for Bodie Lighthouse cost $150 in 1846
• The total cost of construction was $140,000
• The first keeper of Bodie Island Lighthouse was paid an annual salary of $400.
• The tower still houses a 1st-order Fresnel len1s

No, the Cape Hatteras lighthouse is not the oldest lighthouse anywhere, not in the state, not in the world, not in the country. The Cape Hatteras lighthouse is, though, the tallest lighthouse in the United States. Actually, it is the tallest lighthouse in North America. It is one of the tallest brick lighthouses in the world, at 193 feet tall. If it is the oldest anything, it is the oldest lighthouse in the town of Buxton, being the only lighthouse in the town of Buxton.

Because without a guiding light, the ship can't see the shore and it will crash.

Cape Lookout Lighthouse was created in 1857.

The first lighthouses could be said to be those of ancient times when fires were set along waters' edges to warn boats about rocky and dangerous reefs and shorelines.

The Egyptians were actually the first group of people to build a lighthouse, complete with wick lamps for light. Between 285 and 247 BC, the Egyptians completed the tallest lighthouse ever built. It was 900 feet tall and lasted for over 1,500 years. This was known as the Pharos, or Lighthouse of Alexandria. Other early builders of lighthouses included the Phoenicians, Greeks, and the Romans.

The "modern" lighthouse lens was invented by Frenchman Augustin Fresnel in 1822. The Fresnel lens used prisms to enhance the power of the light, and was much thinner than previous lenses, allowing more light to be passed and enhancing visibility of lighthouses over greater distances.

The world's first known lighthouse, and the tallest, was built by the Egyptians somewhere around the year 279 or 283 BC. This was the famous Pharos, or lighthouse of Alexandria, which was situated on the eastern point of Pharos Island, off the Nile Delta.

Over 2.3 million tourist visit Cape Hatteras each year. Cape Hatteras is located on Hatteras Island on the Outer Banks of North Carolina.

The first lighthouse was built with white stone because white stands out in the darkness and can be seen clearer than other colors, so as you know lighthouses are built for signaling ships into the harbor. the white stone is so the people on the ship can see the white as well as the bright light.

However some modern lighthouses are built with glowing panels built into the stone so that it can be seen at night.

sixteen named after Alexander the great

Not sure about the rest, but my hometown Alexandria, Minnesota was not named for Alexander the Great. It was named for Alexander Kincade the first Post Master General of the area.

There are at least ten lighthouses in North Carolina

Currituck Beach

Bodie Island

Roanoke Marshes Replica

Cape Hatteras

Ocracoke

Bald Head (Cape Fear)

Oak Island

Cape Lookout

Roanoke River

Price's Creek

how far is the signal visible in miles

I love Ocracoke. the correct pronounciation is: oak-ra-coke. pretty much just as it looks

The curvature of the Earth creates the "horizon", which varies in distance depending on the height (elevation) of the land. Because the sea is uniformly "flat" in elevation, the only normal way to see farther is to climb to a higher part of the ship (for sailing ships, the masts). The same principle works in reverse for a lighthouse : it stands higher and so it "pokes up above the horizon". From the top of the lighthouse, you can see farther, and in turn be seen from farther away.

1 white flash every 7.5 seconds.

See www.outer-banks.com/lights/nhatteras.cfm

The address of the Point San Luis Lighthouse is: 1124 Nipomo St, San Luis Obispo, CA 93401

By looking at how bright the light is, sailors can work out how far away they are or how close they are because, the brighter the light the closer they are. the further away they are, the light will be much dimmer.

Hope this helps, I was stuck on it too but then i figured this out. :D

Love from xxSxx

Henry Hall - lighthouse keeper - was born in 1661.

I don't think the Romans had a word for "lighthouse" but I suppose the phrases "Turris Lucis" or "Domus Lucis" would suffice.

The first means "Tower of Light" and the latter "House of Light."

The Cape lookout lighthouse was built in 1857 at the authorization of the US Congress at the time. It is located on the Southern Outer Banks of North Carolina and stands 163 feet high. It is the only lighthouse in the US that has the checkered daymark painted on it.

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The tallest lighthouse in the world, according to World Lighthouse Society, is the 101 m or 331 ft Marine Tower in Yokohama, Japan. It is believed that the tallest lighthouse ever in history was the Pharos, or Lighthouse of Alexandria, which was said to be 140 m or 459 ft high. The highest lighthouse in the world is a different matter. According to the El Dorado County (California) Visitors Authority website: The lighthouse at Sugar Pine Point on Lake Tahoe is the highest lighthouse, in elevation, in the world. It is located between Tahoma and Meeks Bay and stands at an elevation of 6,229 ft, 1,898 m.

It was built in 1790

Since the 13th century? None. That's when it was destroyed in an earthquake.