How A Lighthouse Works | The Secret Life of Lighthouses | Channel 5

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Rob Bell explains how the light in a lighthouse shines so bright and how they rotate.
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[@lejonfo]

I always wonder what was inside a light house the bulb and all. Thanks for sharing.

[@neilurwin9670]

A Phenomenal Well Put Together Video All The Best To All The Team.

[@ollyk22]

Actually, this is not a great explanation of a Fresnel lens. While the bulls eye might look prism-like, it works through refraction. It is a Dioptric lens, that has been cut into concentric circles and the bulk of mater removed to create a much lighter and smaller form factor. The extra glass surrounding are prisms and they reflect (Catoptric) and collect extra light that would otherwise be wasted. Together they make a very efficient and most importantly, lightweight way of producing a concentrated beam of light. It is known as a catadioptric system.

[@yzScott]

Exactly so.

[@abhirupbasu6808]

awesome explanation

[@oops..well2628]

It's quite interesting. Human overcomes natural force to build lighthouses. 😀

[@seltaeb3302]

Watched the Wolf Rock lighthouse in Series 2 & I was expecting to see the process in building it & there wasn't one bit of it, yes the rest was interesting but surely 15mins could have included this Rob, I mean what a feat in an area that is rarely becalmed & we won't know of it.

[@klondikebelridge1996]

The Lighthouse movie brought me here.🙂

[@RusTsea196T]

Were the lighthouse keepers aware of the toxicity of mercury? I can remember our whole elementary school science class being encouraged to touch it and let it roll around in our hands (1970's). The danger wasn't realized at that time.

[@aronkovacs1386]

The biggest problem with mercury is its fumes.

[@94rome]

Anyone here after Max Millers video of Lighthouses?

[@joejoe43200]

Came here after saw The Lighthouse movie. lol

[@watchguy7986]

Me too

[@davidsimplicio4676]

I would like to work there, with a Xbox, a dog, food, WiFi and lets go and Air Con.

[@who-gives-a-toss_Bear]

Where is the rest? Just to get you to sign up to a scam site! Give us a break.

[@seltaeb3302]

It's not a scam site but showing a preview of the episode.

[@charlieward5609]

First

[@watchguy7986]

But the lighthouse bulb was still heavier than 25 pints of mercury why didn’t it spill out and the bulb go down to the bottom ? Was it under pressure ?