The Underground Telescope - Objectivity 232

[@benjaminfacouchere2395]

The latin inscription at 6:54 translates to: well depth is 120 feet with the tube for parallax observation of the earth.

[@Schnabeltassentier]

Objectivity is simply the best channel out of all of Brady's projects, always lovely to get a new video!

[@ObjectivityVideos]

Share with your friends. ;)

[@andrewyellstrom2585]

The fact these videos aren't getting more views is criminal

[@no_handle_required]

This is the type of history worth remembering.

[@ianmaxfield2]

These detailed pictures of the 'new' observatory are great!

[@una_10bananas]

Always a lovely surprise to see another objectivity video!

[@yankeeclipper4326]

It is indeed!

[@vickijohnson4668]

Keith has the most mellifluous voice. I could listen to him all day. Those illustrative prints are beautiful, thanks Brady ***

[@Vardagaladhiel]

I was really excited to get the notification for this as I’ve been having a stressful week, and the video did not disappoint! Loved the inclusion of the modern day images as well as those from the period, and a really interesting object!

[@RadioactiveSheep]

Yes! Objectivity is not dead yet :) please keep doing this videos Brady, this has grown to be my favorite channel of yours!

[@steamgadget]

Thank you Brady for another excellent objectivity video. Thanks to Keith for sharing these amazing pieces of history with us! As an artist and huge science fan, I would love to see a video of drawing and design instruments used by scientists of the past. Just a thought. Keep up the great work!

[@syntheticsandwich190]

Never heard of a well telescope. Very interesting

[@rooarox]

Brady does Australia proud, this channel and his others are some of my favourites on youtube.

[@alandyer910]

Excellent! I had never heard of Flamsteed’s well telescope. The technique was used again in the 20th century for solar telescopes but with a movable mirror at the top to track the Sun. I think having most of the light path underground minimized turbulence from heat.

[@WhatAboutTheBee]

Perhaps Nevil Maskelyne, Astronomer Royal, first practical implementation of the Lunar Method of determining Longitude in direct competition with John Harrison's clocks, has some artifacts at the Royal Society. Worthy of coverage!

[@JohnMorris-ob9rz]

Hmm so were the letters purchased or obtained free as the note's note notes?

[@NotKyleChicago]

I too wondered this.

[@mikimooooooo]

My two worlds collide as I work at the Royal Observatory! Would love to see an Objectivity video take place at the ROG!

[@ObjectivityVideos]

That’d be great.

[@ThePlacehole]

I'm a bit worried that one of these videos is going to be the last.

[@helenaren]

me too tbh, Objectivity is showing symptoms of imminent channel retirement. I hope I’m wrong

[@romanski5811]

Nah, maybe when Ketih dies, then it'd be appropriate. But I don't think that's gonna happen for a very while.

[@helenaren]

@@romanski5811 or when Keith retires and some lesser librarian takes over

[@dansv1]

@@helenaren What symptoms?

[@QuantumNymph]

It would be very cool to find out more about these drawings and graphics, they're so detailed!

[@richardblackwell874]

Brady, an uncle of mine once wore into the British Museum of Natural History a cap of the style you're wearing in this video. An elderly Englishwoman stormed up to him, glared at his cap, and said, "Good Lord, man, where are you manners?"

[@ObjectivityVideos]

I’m lucky Keith is more tolerant.

[@SquirrelGrrl]

I’m always fascinated every object!

[@liamoconnor3890]

Yay another Video

[@Ana_crusis]

way hey! a new Objectivity video ! :) Only 8 minutes!!!

[@johnmurrell3175]

Robert Hooke did something similar in 1666 - 1677 by building a telescope into the Monument to the great fire of London by the North end of London Bridge. Some parts of this still exist including the mount for the objective lens and the position of the reclined observers chair. It was intended to observe a specific star to determine the parallax but failed. One of the problems was the telescope 'tube' though built of a large amount of Portland Stone bends when heated by the Sun and meaning massive takes a long time to cool. You could (pre-covid) visit the Monument and walk up the steps to the viewing platform but this is below the level of the objective lens. Hooke & Wren also designed the steps with a 6" rise so the Monument could be used as a laboratory for long pendulums and dropping objects. Wren had previously used St Paule Cathedral for this as well as mounting his telescope.

[@MountainFisher]

Being a bit of an amateur astronomer I recognize the name Flamsteed by stars that still are designated with Flamsteed numbers. Flamsteed's designations differ from the Bayer designation and use of the Greek letters, which is a pain to remember. This method of designating stars first appeared in a preliminary version of John Flamsteed's Historia Coelestis Britannica published by Edmond Halley and Isaac Newton in 1712 without Flamsteed's approval. Flamsteed designations gained popularity throughout the eighteenth century, and are now commonly used when no Bayer designation exists. Where a Bayer designation with a Greek letter does exist for a star, it is usually used in preference to the Flamsteed designation. (Flamsteed numbers are as I said preferred to Bayer designations with Roman letters.) Flamsteed's catalogue covered only the stars visible from Great Britain, and therefore stars of the far southern constellations have no Flamsteed numbers. Flamsteed observed Uranus in 1690 but did not recognize it as a planet and entered it into his catalog as a star called "34 Tauri".

[@billyhendrix5544]

Yay new objectivity!

[@FPSNecromancerBob]

If it's a spiral stairs going down a well there's a good chance the subterranean architecture is still there. Does objectivity have an archaeology division yet that can go looking for more objects?

[@RogerGarrett]

Hmmm, was the "well" just filled in? If so, it would be very interesting to try to excavate it, see what might be down there. make it again possible to descend down into it.

[@GS0Sunatori]

hexagonal or octagonal?

[@quackerzdb]

Very interesting content

[@txhunter144]

Thank you!

[@NotKyleChicago]

Were the letters purchased or were they "obtained free" as annotated?

[@atzuras]

Maybe the vertical telescope would had better use near the equator line or nearby.

[@FlyingSavannahs]

They must have had large eyepieces as well. My sort of big 40mm Plossl would give 686X which is about 3X more magnification than is practical because of the atmosphere, especially for London skies! What system of objective image magnification was developing then?

[@Nobe_Oddy]

wait a second there... @ 3:21 the engraving says "Flamstead's O.G 90 ft...." I think there may have been a "TYPO" in that engraving... I think it was MEANT yo say "Flamstead O.G. 90 ft..." as in Flamstead IS the (O)riginal (G)angsta - since he was THE FIRST 'Astronomer Royal" the HE IS "The O.G. Astronomer Royal" lol ;)

[@zapfanzapfan]

It's like the Gaia space craft but instead of a telescope on a rotating space craft the telescope was firmly built into a rotating planet :-)

[@pixel1185]

Ah yes, Flamsteed's OG

[@ericbaer7880]

This is object #25 of the RS. What is object #1 ?

[@Nobe_Oddy]

HAHAHA!!!! @ 5:57 he says it's a 'well telescope" but IO think it SHOULD be called a "Welloscope" :)

[@phillipgreenberg6027]

If this was object #25, what is object number 1?!

[@axiomaticisak4350]

More Hello Internet please Brady

[@steve1978ger]

I wonder if that well might have been a bit dangerous to be in, in terms of oxygen starvation

[@JimFortune]

An objectivity objective object.

[@lbochtler]

would be interesting to see images taken through that object glass

[@firstnamegklsodascb4277]

not really though

[@lbochtler]

@@firstnamegklsodascb4277 i for one find the idea very fascinating

[@domy6827]

CC please

[@SoleaGalilei]

Cool!

[@jhodgson89]

Nearly 300 years later and I still feel bad about that engraving... ;)

[@oclipa]

Hands up who wants to dig down into well and see what's down there 🙋‍♂️

[@ObjectivityVideos]

🤚

[@Bibibosh]

KZbin is more than funny videos KZbin is basically where i go to learn about everything

[@LiLi-or2gm]

That glass is barely convex! With a focal length of 90', it's nearly flat!

[@scientistsexperiments8241]

How to make underground telescope?

[@SpaceFactsWax]

Thank you for sharing. I had the chance to witness a rocket launch in 2018. Unbelievable experience. I posted a pretty cool video of the trip to my page.

[@nsfeliz7825]

keith looks like a 70s rock star

[@GildedEntries]

Why is there a bust of Charles Laughton in the back?

[@io4439]

Keith has tremedous poise

[@chrisdenney2997]

video ended too soon.. wtf

[@mojosbigsticks]

Well, well, well...

[@gowdsake7103]

Wow I thought my writing was bad

[@Olhado256]

Why move a telescope when you can just stick it in a well and let the Earth do the moving?

[@zapfanzapfan]

@William White A good attempt but it took another 150-ish years before we managed to measure parallax and the distance to the stars.

[@thejll]

Indeed. Spinning liquid mirror telescopes do the same trick today.

[@leewilliam3417]

Mmmmm😊