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The luminous intensity of a light, or its candlepower, is expressed in international units called candelas. Intensities of lighthouse beams can vary from thousands to millions of candelas. The range at which a light can be seen depends upon atmospheric conditions and elevation.

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Portland Head Light,
cape Elizabeth, Maine.

Cape Hatteras Lighthouse, North
Carolina.

Hook Head Lighthouses in Ireland.

Chania Lighthouse, Crete, Greece

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1. Who created the first Lighthouse?

2.  What is the name of somebody who runs the lighthouse?

3. Who is the Lighthouse of Alexandria named after?

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First lighthouse built in the United States was Boston Lighthouse built on Little Brewster Island. This lighthouse was destroyed during the Revolutionary War and was rebuilt in 1783 and still stands today.

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Lighthouses are made to give light to the sailor at night to see and not hit land and warning them of hazards. Lighthouses are still used today.

Most lighthouses rhythmically flash or eclipse their lights to provide an identification signal. The particular pattern of flashes or eclipses is known as the character of the light, and the interval at which it repeats itself is called the period.

Lighthouses are usually placed by a body of water were ships pass by. Specifically on a island or shore.

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Inside of a Lighthouses and what they are made of

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Inside of a Lighthouses and what they are made of

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Some are made of stone; others brick, concrete, wood, steel, cast iron, and even tabby (a mixture of shells, lime, sand, and water).
Lighthouses need to be tall so ships can see their light from far away.

Lighthouses are usually circular with ladders going up into separate decks or a stairway leading up to the top. Their could be a circular column going up to the top containing lighting equipment things to make a the light of the lighthouse shine.

Looking at this picture you can infer that being a Lighthouse keeper would not be a comfortable job.

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https://www.youtube.com/watch?v=H8X7ijMOvK8

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ponceinlet.org

coastline.https://www.msn.com/en-gb/news/photos/17-ancient-greek-contributions-to-modern-life/ss-AAdn5ES#image=2

existence.https://www.greekboston.com/culture/inventions/lighthouse/

www.britannica.com/technology/lighthouse

Lighthousedigest.com

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How lighthouse have changed from 290 BC- 2018

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How lighthouse have changed from 290 BC- 2018

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Without the Greeks, Lighthouses may not have have been discovered.

The early lighthouses had wood fires or torches burning in the open, sometimes protected by a roof. After the 1st century CE, candles or oil lamps were used in lanterns with panes of glass or horn.

Today, Lighthouses Use a very powerful light, called a beacon. The structures of lighthouses and the construction of them are much better. Some lighthouses don't even have a lighthouse keeper anymore.

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Ptolemy Somer created Lighthouse of Alexandria, The first Lighthouse in the world. It was named after Alexander the Great who died years before. This may be one of the biggest effects to the U.S

It was created in 290 BC on the Island of the Pharaohs in Egypt.

Ptolemy was the ruler of Egypt so he decided to build the lighthouse so that it would guide ships to the port.

Inside the lighthouse there was a large mirror inside, possibly made of polished bronze. The purpose of the mirror was to project a beam of light from the reflection of the fire. The building was approximately 450 feet tall.

In 1323, after a series of earthquakes, the lighthouse of Alexandria collapsed.