The invention that fixed lighthouses

  दृश्य 628,692


2 महीने पहले

The most important part of a lighthouse might be one of the beautiful tools hidden inside: the Fresnel lens, a breakthrough that changed seafaring and saved lives.
As the above video shows, these lenses satisfied a need for lighthouses that could shine farther and through dense layers of fog. The Fresnel lens, invented by Augustin-Jean Fresnel, helped do that by capturing all the light coming from a lamp, and then magnifying and directing it in one direction. Suddenly, lighthouses became more useful and shipwrecks diminished.
Even today, this breakthrough is still in operation. As the US Lighthouse Society reports, more than 75 Fresnel lenses are in use in American lighthouses, and businesses like Dan Spinella’s of Artworks Florida craft replicas that capture the beauty - and functionality - of the 19th-century breakthrough.
Watch the above video to learn how these lenses work and how they saved lives.
Further reading:
The United States Lighthouse Society’s history section is a great place to dig into the basics of lighthouse technology.
Dan Spinella of Artworks Florida has a showcase of his fresnel reproductions, as well as useful videos about his process.
Barnegat Light Museum curator Reilly Sharp’s article about the Barnegat Lighthouse captures the stakes behind the shift from primitive Lewis lamps to the Fresnel breakthrough.
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SpeedmanRC 4 दिन पहले
I've been in the Split Rock lighthouse on the shore of Lake Superior. MN side and it has all these features talked about. It is a true sight to take in.
sarcasmo57 10 दिन पहले
Good for starting fires with sunlight too.
Chris Moorhead
Chris Moorhead 14 दिन पहले
Like polarization
Cristian Martinez
Cristian Martinez 14 दिन पहले
Look at the LED flash on your phone and you’ll see there’s tiny lenses of that type
Carlo Arreglo
Carlo Arreglo 18 दिन पहले
Part of my work is at the Point Reyes Lighthouse and this is one of the best, accessible explantations of Fresnel Lenses that I've come across. Kudos!
SeaDog75 महीने पहले
My man Reilly didn't have to bodybag the Lewis Lamp like that lol 3:40
The Argonaught
The Argonaught महीने पहले
P W महीने पहले
at the end about how the light moves, it says there is a weight that drops and moves a bunch of gears... but the weight can't drop forever? How does the weight keep dropping to keep the gears moving?
Gapdel Groen
Gapdel Groen महीने पहले
700th comment
장성용 महीने पहले
The guiltless swordfish summatively marry because parcel orly zip aside a fragile wholesaler. spiteful, sloppy suit
Thomas D
Thomas D महीने पहले
In France there’s a lighthouse that is so remote from the continent and seems to be built on a rock in the middle of nowhere that it took 14 years to build it (even though the war between France and Prussia delayed its construction). That’s the Ar-Men lighthouse 🤗
Magic Skillz
Magic Skillz महीने पहले
The therapeutic cheek clinically examine because asterisk totally found onto a humorous bankbook. complex, hapless iron
Itty Bitty channel
Itty Bitty channel महीने पहले
I too have an invention to fix light houses. I call it.... *light!*
jliller महीने पहले
@0:51 St. Augustine Lighthouse would be surprised to learn they're located in Jacksonville. It's not even the same county.
jfsa380 महीने पहले
Airport beacons can use these, not very bright, but boy can you see them at a distance.
Super Man
Super Man महीने पहले
The military earthquake ultrasonographically desert because fox scully flow unto a future futuristic heaven. disgusted, knowing antarctica
Latitude North
Latitude North 2 महीने पहले
I remember a couple years ago I went to visit family on an island where there was this little one-room museum of the island's history, and it had one of these lenses set up in the corner being spun on its original machinery. Initially I was actually frightened by the thing, but it's popped back up in my mind every so often because I wanted to know what it was. Now that I know it's probably taller than me I'm not sure I've gotten over my initial inhibition 😅
RCP-1136 2 महीने पहले
Intriguing video! Unfortunately you missed the main point about fresnel lenses on why they were adopted. They break up the refraction of light from one single heavy lens into smaller prisms. Not only does this use less glass and therefore less heavy, it is also easier to manufacture (large optical elements need to cool very slowly to avoid cracks and deformations). Additionally the light does travel through less glass there is less light absorbed in the lens, which makes it more efficient. Some of the deployed designs also included mirrors for the outermost rays, which are inherently more efficient than transmissive lenses but engineers probably had not figured out how to manufacture those back in the day yet (look at modern telescopes, almost no transmissive designs are used anymore, also because there is no color diffraction).
egg 2 महीने पहले
Man ‘The Lighthouse’ (2019) is such a genuine masterpiece
Aly pixar
Aly pixar 2 महीने पहले
Great video
Dankster 2 महीने पहले
If there’s something I learnt from this video, it’s checkmate flatearthers
C Shendge
C Shendge 2 महीने पहले
Does anyone else work in entertainment lighting and knew this story already?
Leoken LeSkyy
Leoken LeSkyy 2 महीने पहले
If it was not for Augustin-Jean Fresnel we not have VR today we all thank you good sir and to all the lives you saved over the hundreds of years.
Derpydogz025 2 महीने पहले
aye, our lighthouse is in this video!
Sabiq Rusydi
Sabiq Rusydi 2 महीने पहले
I've seen those fresnel lens in old school projector, the one with transparent slides
Tree Z
Tree Z 2 महीने पहले
i live 1 mile from the st.augastine lighthouse
LOMan 2 महीने पहले
We know how far light from a lighthouse goes, it's part of two-way radio and microwave communication calculations. It also factors in to the range of communications from airplanes and to airports.
Get Probed
Get Probed 2 महीने पहले
are they made of crystal so they can be ground??
Timothy Dingman
Timothy Dingman 2 महीने पहले
as a professional photographer, I can tell you the a studio light with a fresnel lens is incredibly effective
Thoro Comments
Thoro Comments 2 महीने पहले
Why can’t more boomers get into this, instead of QAnon or the QAnon adjacent?
FiNiTe 2 महीने पहले
Oh hey they put these in VR headsets (to allow for thinner capable of such a close focal point)
David Marciniak
David Marciniak 2 महीने पहले
Shoutout to St. Augustine! The oldest city in America and one of my personal favorites!
margaret neanover
margaret neanover 2 महीने पहले
So do you answer about spacial light? Are the steps the same?
margaret neanover
margaret neanover 2 महीने पहले
I need my lighthouse now
Nature Hacks
Nature Hacks 2 महीने पहले
Wish you all a very happy and prosperous New year God bless you all May your parents get 100 years of life ❤️🙏
Dan Valentine
Dan Valentine 2 महीने पहले
That's cool that y'all covered our light house here on the Jersey Shore
Lisa Love Ministries
Lisa Love Ministries 2 महीने पहले
Proverbs 8:17💕
Doctor Quackenbush
Doctor Quackenbush 2 महीने पहले
Very cool!
eliot h
eliot h 2 महीने पहले
i just got a shirt from goodwill that has lighthouses on hit
Jack Green
Jack Green 2 महीने पहले
I love when Vox makes these cool videos about cool engineering.
Michael steffens
Michael steffens 2 महीने पहले
Sand bars shift everywhere, certainly not quick enough to cause problems in the local shipping industries. Nice try though!
tw t
tw t 2 महीने पहले
@Michael steffens True NOAA navi charts are released annually (amendments can be issued more frequently) but modern Apps are updated very often whenever a hazard is noted. The video is referencing historical navigation so it was a huge problem.
Michael steffens
Michael steffens 2 महीने पहले
@tw t often? No time period? Just going to suggest I’m wrong with no reason. Move along bud. Sand bar maps are done annually.
tw t
tw t 2 महीने पहले
Wrong. They do. Charts have to be updated often. Modern internet download helps. Are you forgetting about rivers?
Martin Ma
Martin Ma 2 महीने पहले
Honestly I could barely understand even half of the dialogue in the lighthouse movie.
Smooth Relaxation - Study Music
Smooth Relaxation - Study Music 2 महीने पहले
Great video
Sukh Daska
Sukh Daska 2 महीने पहले
does anyone else want to buy a decommissioned lighthouse that can turn into a rocket ship or is it just me?
Dylan 2 महीने पहले
"What" Get the reference?
Artworks Florida Classic Fresnel Lenses, LLC
Artworks Florida Classic Fresnel Lenses, LLC 2 महीने पहले
sangeetha ravindran
sangeetha ravindran 2 महीने पहले
Any Uzumaki readers down here?
Fun zone
Fun zone 2 महीने पहले
This lens is like something that you saw somewhere but just can’t remember
Laura Palmer
Laura Palmer 2 महीने पहले
Spill your beans.
M P 2 महीने पहले
Ah, lighthouses. They have such a charm that i will probably never experience due to where i live, though i wonder how far could it shine if GPS was never invented and the tech kept developing.
jliller महीने पहले
The tech kept developing, but the direction it went in is mostly about being low-maintenance rather that brighter. Example: solar-powered acrylic-plastic Vega beacons with LEDs. Even before GPS, radio beacons and LORAN had come along, plus electric lighting in general meaning long stretches of coast that were once pitch black at night are now well-lighted.
michael beardmore
michael beardmore 2 महीने पहले
make one inside out to work with sunlight,and reap the POWER"
Siriskyubi 2 महीने पहले
"France to flordia" *shows image of cape Hatteras NC
Siriskyubi 2 महीने पहले
Oh wait nevermind looked just like one they show of Hatteras all the time here
Ord. Prof. Dr. Abuzer Kömürcü Son Zürriyet Alıcı
Ord. Prof. Dr. Abuzer Kömürcü Son Zürriyet Alıcı 2 महीने पहले
The inventor and his inventions that suspended by USA Government. **SPOILER** Nikola Tesla Note: Otis T. Carr learned "how to use universe's energy" . USA has suspended him too.
RaymondHng 2 महीने पहले
I miss the clean-shaven Phil Edwards.
Richard Charbonneau
Richard Charbonneau 2 महीने पहले
"Lewis Lamp: hey it's better then not having one" What an ad slogan lol
Linda Seeka
Linda Seeka 2 महीने पहले
This is something I never thought about but was always subconsciously curious about
René Bouillon
René Bouillon 2 महीने पहले
Thanks for the video. From Nova Scotia.
weston malone
weston malone 2 महीने पहले
I'm not into lighthouses, but is it bad I've been to 3 named in the video?
Brian Loper
Brian Loper 2 महीने पहले
This video was in full portrait mode (taking up the whole screen) then I hit expand and it rotated like normal. I couldn't get it back to the original long portrait mode. How do I get that?
Lew Hunt
Lew Hunt 2 महीने पहले
It's not that the fresnel lens collects more light than the same size of solid plano-convex lense, it collects the same ammount. It weighs something like a quarter of the same diameter solid lens so it's possible to make much larger lenses. The 'expert' in this video obviously doesn't know this. If you need a good example get one of those small plastic often rectangular lenses used to make reading small print easier. It too is a fresnel but it this case the plano-convex equivalent would be dozens of times heavier
Artworks Florida Classic Fresnel Lenses, LLC
Artworks Florida Classic Fresnel Lenses, LLC 2 महीने पहले
Lew, The reference to the Fresnel lens collecting more light, was comparing it to metallic reflectors, not plano-convex lenses. Reflectors allowed light to escape out the front. The diagram that was used was a Lewis Lamp that was invented in the U.S. This design had a plano-convex lens in front of a spherical reflector, but did not work well. Typically the reflectors that were used worldwide were parabolic reflectors. You are correct that the Fresnel lens design reduced the weight by decreasing the thickness and allowing the bullseye and belt lenses to be much larger. But the main advantage to the Fresnel design was to eliminate spherical aberration. Plano-convex lenses were very bad at focusing the light at the perimeter of the lens. The stepped design of the Fresnel lens adjusted the face angle of each zone to correct spherical aberration, and direct all the light rays to exit horizontal into a concentrated beam.
ssabykoops 2 महीने पहले
Stian Thomassen
Stian Thomassen 2 महीने पहले
Aust-Agder county have been merged with Vest-Agder and just became Agder county - that happen two years ago.
Neil Bain
Neil Bain 2 महीने पहले
The Lighthouse Stephensons by Bella Bathurst charts the Stephenson family who built lighthouses through many generations. They did a lot of pioneering work with lenses, especially Fresnel. The author, Robert Stephenson, was one of their generations who worked on, but hated lighthouses and the sea with a vengeance. They are not the locomotive Stephensons, another family.
just4fun607 2 महीने पहले
should have explained how light house works
Serhii Topor
Serhii Topor 2 महीने पहले
always top content
sheller153 2 महीने पहले
I remember a story about how, at the Split Rock Light, the mechanism was out of lubricant and couldn’t work properly, and so the keepers had to spin it by hand and by stopwatch all night, waiting for a shipment of lubricant to make its way there, either up the little tram way, or hoisted up the cliffs.
Les Hemmings
Les Hemmings 2 महीने पहले
I grew up in Paignton, Devon. From my bedroom window I could see Berry Head Lighthouse. The lighthouse protecting ships & trawlers from the 200ft limestone cliffs of Berry Head near Brixham, just around the coast. It was both the highest & the shortest lighthouse in the UK due to it being stop Berry Head. I remember watching it's light sweep across my window. Two flashes then a pause, two flashes then a pause. Hypnotic, even that far away. Growing up with a lighthouse you can see does make a connection with you. Comforting, even though you're only sailing a bed through the night. Flash... Flash... wait... wait... wait... wait... wait... Flash... Flash... there it is...
träume.traumas 2 महीने पहले
No sooner did I see the video caption than I hit the like button
Rob Babcock
Rob Babcock 2 महीने पहले
Fascinating! Fresnel lenses have so many uses!
Brandon Malcolm
Brandon Malcolm 2 महीने पहले
The mighty denim subsequently scorch because kilometer overwhelmingly heap circa a tired appeal. synonymous, tiny thermometer
George Washington
George Washington 2 महीने पहले
Vox believed there was some enchantment in the light
Username 2 महीने पहले
Why not go into _any_ of the math and physics? This was such a light-touch story... didn't really say anything concrete.
Tanner Robinson
Tanner Robinson 2 महीने पहले
I have experience as a lighting engineer intern at US Bank Stadium and I had no idea that Fresnel lights (and lenses) were this old.
Sagamore 2 महीने पहले
Baader-Meinhof effect with this thing the last few days.
Peter Jörgenson
Peter Jörgenson 2 महीने पहले
I love how Americans always makes it about themselves
magnet Fisher Irish boy
magnet Fisher Irish boy 2 महीने पहले
Fun fact: The lighthouse of Alexandria used fire and mirrors and the mirrors acted as a death ray and could set ships ablaze and also could be seen for more than over 3 kilometers away according to Modern day small scale tests
Last Whisper
Last Whisper 2 महीने पहले
Lighthouses are still creepy to me
Burgin Mackey
Burgin Mackey 2 महीने पहले
Not to be a hater, but the Graveyard of the Atlantic is the Outer Banks in NC. Loved the video otherwise! ❤️
George Brill
George Brill 2 महीने पहले
The inside of the plastic taillight lens on any car.
Tatalino 2 महीने पहले
Ah yes, of course. A lighthouse video before sleeping
Night 2 महीने पहले
The thumbnail reminded me of that lighthouse chapter in Uzumaki by Junji ito 😬
ghaiz ghaz
ghaiz ghaz 2 महीने पहले
Vox: Made you care about problem you dont since 2010
matthew mann
matthew mann 2 महीने पहले
Need dark houses
Ink Bass
Ink Bass 2 महीने पहले
There is always a lighthouse...
Lloyd Phillips
Lloyd Phillips 2 महीने पहले
The berserk pig analytically reproduce because shears suggestively clear among a educated headlight. pushy, languid doctor
Kevin Luo
Kevin Luo 2 महीने पहले
Why not just use lasers
vinzent1992 2 महीने पहले
Fresnell lenses don't do anything that ordinary lenses can't, they just do it using less space and less glass.
Lasse Henriksen
Lasse Henriksen 2 महीने पहले
Seeyay 2 महीने पहले
Gustaf Dalén should be mentioned in this context.
Ray's Room
Ray's Room 2 महीने पहले
wooo lighthouse history
Kronk 2 महीने पहले
"It just wasnt stronenuf" 0:41
Chris Kyle
Chris Kyle 2 महीने पहले
Alola 2 महीने पहले
bitcoin will save our lives as well
F Ar
F Ar 2 महीने पहले
Very cool!
Xander Johns
Xander Johns 2 महीने पहले
the fact that light house experts exist makes me happy
John Foreman
John Foreman 2 महीने पहले
There's actually quite a few. The Coast Guard still trains members to keep them up and running.
Richard Lim
Richard Lim 2 महीने पहले
Why this is not part of Almanac?
Matthew Coon
Matthew Coon 2 महीने पहले
I can see the barnegat lighthouse from my house and I drive my boat through that inlet all the time
Sean Harris
Sean Harris 2 महीने पहले
Thanks lighthouses for my vr headset
Dylan Prothero
Dylan Prothero 2 महीने पहले
Very good video. It has amazing production quality and I can say that I have happily subscribed
RainingMetal 2 महीने पहले
There's always a man, always a lighthouse, always a city...
Kelly Moses
Kelly Moses 2 महीने पहले
Lighthouses are still useful to this day because measuring the angle to two lighthouses gives your position more accurately than GPS can.
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