Modelling Magnetism - Objectivity 239
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- čas přidán 13. 05. 2021
- Brady and Keith are back at the Royal Society to look at a fascinating 19th Century magnetic surface model. More links below ↓↓↓
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Such a Brady move, to just take the object on a stroll.
"Can I hold it Keith?"
*Starts lifting before Keith answers*
"Sure Brady."
"Thanks. Bye!"
Hands up who's heart jumped into their throat when Brady decided to take the model for a walk.
Brady: [talking talking walking talking]
Me: don'tdropitdon'tdropitdon'tdropitdon'tdropit
I wonder whether some accident happened one time and they're hiding it from us.
@@smaakjeks Yeah man, me too, absolutly!
@@romanski5811 Brady had to have broken something important lol, seems like there’s a running joke about him being clumsy.
So happy to see you're back together making new videos.
yoooo so stoked to see you back at the royal society with keith! i’ve missed learning about things i didn’t know i wanted to learn about. cheers
Brady just walking around doing a room tour with that thing in his hands had me sweating.
I'll never get over how old these items are while still being in good shape. It's like Brady and Keith traveled into the past, grabbed something off the table and then came back to show it off.
Think it's mostly due to decent construction. They're still rather battered, missing bits and tags. Just that the objects were made to last back then.
And the video ended with a collective sigh of relief when Brady finally put it down again!
Absolutely missed these irl videos ty Brady and Kieth!
Tough day, but then Keith turned up.
All's well now.
Thank you!
Great video. I feel like if I saw that piece somewhere in a museum I wouldn't have given it that much time but with all the explanations, it really comes to life. I can imagine Bache working on it manually in his lab. By the way, Keith agreed for you to hold it but I am not sure he agreed to you walking with it haha. Can't help but think he might have been uneasy with that. But I guess may be after all these years, he has a lot of trust for you now.
If you every need a tour guide in Philadelphia, I would be honored to escort you through our fabulous institutions. The Franklin Institute, The Academy of Natural Science....and so much more.
More importantly - the location of where those measurements were taken. Obviously!
The Franklin Institute, The Academy of Natural Science and of course, the most important institution of them all... Pat's King of Steaks
I'm from Philly, but our family moved to Canada when I was young. The Franklin Institute brings back so much nostalgia...it was always my favourite place to visit when I was little. And, of course, my favourite thing to do there was to walk through the big heart!! ❤️❤️
@@Terri_MacKay the big heart has recently been restored and repainted…. Looks great and still captures the imagination
I'll help! The Mütter Museum, america's first Zoo (on Girard Avenue). I hate to say that Girard is not pronounced in a fancy french way.
After a long time watching an Objectivity with my lunch, I have finally caught up. Thanks for the series Brady! Looking forward to watching them as they're released from now on.
Good effort! Thanks for tuning in.
This makes me think of the previous numberphile video on Nightingale diagrams. Since this data "wraps around" annually, perhaps it could be made into a sort of spiral/offset torus.
hm.... I don't think this models intensity at all.
The side scale would suggest the height correlates to an East - West inclination or deviation (from the north pole, maybe), no?
That's why the zero line is marked through the whole piece.
I mean.. there's a very good chance I'm totally wrong, but if it indicated intensity, the piece would have added to it any kind of intensity scale, instead of a east-west one.
Gorgeous piece nonetheless. I'm glad you are back into the Royal Society!
The scale was marked with numbers with prime marks, which probably mean minutes of arc, or 1/60 of a degree. So you're probably right that it was deflection from the 'true' magnetic north, and very slight deflections at that.
As a lifelong resident of the Philadelphia metro area, these days the locals would pronounce the name Girard with the same initial J sound as with “Justice” and the same ending rd sound as with “Ford”
Perhaps in the 1840’s they would have used the French(?) pronunciation, but the name is common enough to have been anglicized by at least the 1950’s.
As a Philadelphian now living in Canada, I got a little giggle out of his very posh French pronunciation of "Girard". 😆
I see Keith, i upvote... Actualy i upvote every Objectivity video... But with Keith i am a "quicker upvoter"
I'm one who never misses an Objectivity, and yet this instalment, along with the one that came two weeks after it, I have only found because they were linked in a Periodic Videos upload. !
Yeah, it's almost like the world is normal again! :) Thanks for being back!
I absolutly adore your videos. Been binging them.
Greatings from the mouth of the amazon river in Brazil.
Brilliant. Thanks for watching!
I think that piece shows the amount the magnetic north pole (measured from that spot in Philadelphia) wanders to the west and east during a day, maybe due to the interaction between the sun's and earth's magnetic fields.
Oh, that is just wonderful!
This is such a quirky and unexpected item, I love it!
And as always it is lovely to see you two at it again! :D
So nice to see Keith again!
I'm sure Keith had a mini heart attack when Brady starting walking away with the model XD
I want to know why the magnetic field of the Earth has a daily cycle. Is there an annual cycle? How does the direction of the field change? How does it change from pace to place? How does it change with elevation?
Love how you just walked away with it for a moment :D
I wonder why it shows this daily periodicity. Is it because the field reacts to the solar wind at noon? If this is the case, I wonder if it is flat during midnight, because the earth is in between the measuring device and the sun.
Do anyone know what quantity is plotted here? From the east west scale I guess the deviation of the magnetic North Pole, but I'd love to know for sure.
Very interesting video! And happy to see things are getting "normal" again in the UK. Where I live we are still very far from it. Cheers!
So is that modeling what today we would call the Kp Index? The higher the index the greater the likelihood of auroras at lower latitudes. I wonder if the 3D model’s data would correspond to increases in auroral activity. It wasn’t clear if the data were for one year or was the model showing an average of several years. Great to see Objectivity back at the RS. More boxes please!
Yey, back at the Royal Society!
It’s good to be back.
Great to see Keith back
YES ITS BACK BABY
It's so great to see this kind of video again!
YES IT HAS ARRIVED!!!
Ah! So nice to see a new Objectivity. Even better to see something as fascinating as that model.
Good to see you guys back together again,,looking fit & well. Great little educational piece. 👍
Loved this!
objectivity???? i clicked so fast!!! welcome back brady, keith!!
Yes!!!!
Ben Sparks loves this episode.
There should be ways to present the graph flat like everyone else does, but nooooo this one's better
Oh my, this one is beautiful
This is lovely data visualization. With 3D printing it's more accessible nowadays, yet you don't see it that much?
If I have awesome data, I will print a 3D model of it for my defense one day.
This is most likely used to highlight some of the "solar-diurnal variation of the magnetic declination", which has been known for some time..
The magnetic field is deviated from true north due to the Suns interaction with Earths magnetic field (inducing current in Earths magnetosphere and ionosphere) making the magnetic needle point slightly westwards and slightly eastwards. If one just knows what to search for it is fairly easy to find a number of papers describing this behavior in more details (some more theoretical and some more descriptive work). One paper was published 1860 in the proceedings of the RS by Sir Edward Sabine (doi 10.1098/rspl.1859.0070), a fairly interesting fellow. Perhaps he, or his work, deserves an episode?
The Earths magnetic field has some daily deviations caused most directly by the Sun (night/day), and some caused by the Moons gravitational tide (on the ionosphere) and some deviations caused by the Suns changing activity during its 11 year cycle... Not to mention local variations (most annoying is when someone passes by close to your magnetometer while carrying some metal).
So many times I've shared your channel link to my friends... but no one subscribes. This requires special taste.
Well we appreciate you sharing it anyway.
@@ObjectivityVideos 🤗🤗
The bois are back!!
Can’t wait to see more videos especially from the professor
This would be so easy to make an object like this today with some computer modeling and a 3D printer. I can't imagine how many hours this must take to do by hand!
good video
It reminds me of the thermodynamic surface produced by JC Maxwell! It's a plaster sculpture that models entropy, pressure, and temperature of a gas in three dimensions, looks not unlike this piece.
If you could make a video on Maxwell's thermodynamic surface, that would be just great :)
From what I saw, the elevation is related to the East-West drift of Earth's Magnetic North Pole.
I don't think that it shows the pole itself moving, just the local magnetic field where the measurements were taken. Considering that it changes cyclically each day it's probably mostly from the solar wind deforming the Earth's magnetic field.
Beautiful example of how science can incorporate artistic expression. Wish art was a mandatory course within the sciences.
Brad Pitt be like 0:07
I would venture the hypothesis that this shows the interraction of Earth's and the Sun's magnetic fields as the planet rotates and the two field orientations change relative to each other. 🤔
I hope the variation is not affected by position of the moon as well.
Aaaw, this episode was almost just like the old days...I miss it
Can we get Keith Knighted, and possibly bottled for future genrations?
MOAR MAGNETS!!
I've missed Keith so much.
Yay!
So that’s how people graphed things before Wolfram Alpha and Matplotlib.
Now a days we would use 3D router to make it. It must have very hard to make so beautifully by hand tools.
Brady you need to make something that looks old and create a story for it.. and then drop it and break it for next April Fool's day. Watching you pick that display up and then walk over to the portrait with it gave me a bit of anxiety. lol.
I am both simultaneously surprised and not surprised at all that there is a painting of Benjamin Franklin at the Royal Society.
You shouldn't be surprised at all, as he was a Fellow of the Royal Society in his own right!
Brady, you had to mention Everest in there somewhere! XD
So, why does the magnet field vary?
What’s in the box?
Pain.
How on earth was this measured? Was he watching the needle of a magnet every hour of every day for a year?
Perhaps something like a seismograph? A clock mechanism that pulls a strip of paper, said paper perhaps being covered in coal dust which got removed locally by a needle controlled by a compass?
HOW did they record the magnetic field in 1840?
PUT IT DOWN, BRADY!
All the presidents of the royal society in this video had side burns. I have side burns too and I so I need to be the president of royal society
How many channels does Brady have?
yes
anyone can elaborate what it shows?
As far as I can tell, it shows the angle of deflection (in arcseconds, or 1/60th of a degree) of a very sensitive compass needle. Probably it's mainly measuring the interaction between the solar wind and the Earth's magnetic field.
It's like a derivative 3d model.
So why _does_ the magnetic field exhibit this behaviour?
I don't know for sure, but it could be the solar wind and potentially the moon (its magnetic field is very weak, but it probably contains enough iron and nickel to still drag the field lines a little bit) deforming the Earth's magnetic field as it rotates.
What’s in the box?!? 📦
- se7en
second
Put the model down, Brady, before you leave the table!
So in the 1800's,when they didn't have computers, 3d printers, cad, etc etc they could still make better graphs than scientists today.
What's in the boooox
Old style CGI.