Newton's Pencil Case - Objectivity 180

[@donaldbustell]

At 1:20, the object is a "lining pen" for use with india ink. The knob adjusts the width of the resultant line. It doesn't hold anything else -- surface tension holds the ink between the points. Pens like this were used by draftsmen through the 20th century, up until the advent of computers and CAD programs.

[@donaldbustell]

And there were a lot of "modern" replacement pens which were not prone to the problems the old style experienced.

[@broer61]

Donald Bustell You are right, when I was at school, when you got a set of compasses, you got a pencil nib and an ink nib like that. You can stil buy them, search for Aristo compasses or drawing set.

[@subjectline]

I am pretty sure there was one just like that in my Granddad's navigational instruments.

[@mojosbigsticks]

Yep, we used compasses like that at school, with an ink bottle. Came here to say this and now I feel so old.

[@BobOgden1]

Indeed. I have used a lining pen (badly) and had a drawing set with some in it but lost track of them many years ago

[@francoislacombe9071]

5:57 "Don't believe anyone. Except Keith, of course."

[@PinkChucky15]

That ring dial is beautiful.

[@corruo]

"Take nobody's word for it." - Immediately proceeds to take Keith's word for it :P

[@ZeedijkMike]

The compass does not use a goose feather. The ink just 'sits' in the gap. This type of pen/compass was still a popular drawing tool for technical drawings, till at least the 70'ies. Other than that, an other great video from the Brady team.

[@sledgehammer-productions]

Refreshing to hear the pronounciation of the Dutch words being done correctly! Go Sietske!

[@jelletje8]

To be fair, she is dutch :p!

[@Nhoj31neirbo47]

Only at the Royal Society could one, upon completing cataloging 40 years of images, choose an exquisite drawing of a rat’s testicle as one’s favorite image.

[@BobSmith-cx4og]

The drawing end of the compasses does not hold a quill! It is an adjustable nib - by tightening or loosening the screw you can adjust the thickness of the line. These are still used - I've used them many times.

[@Nilguiri]

6:52 "skinned a testicle and put it in a jar" [Sharp intake of breath from Brady and me and every male watching!]

[@lzeph]

Really enjoy when you have guests, Brady. Dr. Fransen immediately took a place among my favorites. Exciting work!

[@CJT3X]

All hail the disembodied voice of Keith, the overlord.

[@subjectline]

My Granddad owned a parallel ruler exactly like that. It looks exactly the same. He was a navigator in the RAF in the 30s and 40s.

[@realspacemodels]

It's exciting to see these tools of the trade from the 17th century! I won't comment on the ruling pen as others have done that already. However, I will say that the diagram at 2:10 looks to be depicting an elliptical orbit and is not a "mucked up" circle.

[@markholm7050]

RealSpaceModels And, though many know it already, a compass can not draw an ellipse. There is a trick with string and two pins. Looks like this one was just freehanded.

[@realspacemodels]

Exactly.

[@no_handle_required]

Best videos in my feed. Never disappointed.

[@ncooty]

If there were a font for knowing self-reproachment, then "I asked," (@6:59) would be a great motto for the RS.

[@rillloudmother]

Must say: this woman is right up there with Keith among the best folks ever on objectivity.

[@iltjoa]

More episodes with that lady would be great.

[@Stormgebieder]

What a smile, what a passion! You should make a separate episode in one of your other channels about that beautiful sundiall!

[@andycromwell8229]

I've actually got a micro film copy of the Gregorii Notae - a wonderful insight into contemporary understanding of the Principia. And has never been published and til now been very little studied. There should be somewhere the little diagram of the cannon ball fired from a mountain top going around the earth

[@davidbooth3285]

About receiving an invitation to join the Royal Society! Patrick Moore was found at a meeting of the Astronomical Society with a letter in his hand,crying! When asked what was up,he said that was just what had happened and me only an amateur scientist! I think that’s nice!

[@rtpoe]

Just wondering.... Could there be one episode where you ask Keith and the curators if they've ever damaged an object in their care?

[@CristiNeagu]

1:20 Sigh... No, there's no goose feather missing from there. The nib is complete and that's how it's supposed to look like.

[@CristiNeagu]

And if anyone is interested how that sundial works, small cheap replicas they can be found online if you search for "pocket sundial". The lanyard ring rotates around the circumference of the dial. Using gradations, the ring is set to the current latitude. Then the main vertical ring is aligned north-south. The small piece with a hole in it (2:45) moves on the crossbar and is set to the current month. The time is then read from where the point of light coming from the sun through the pinhole falls on the horizontal disk. In essence, by rotating the lanyard ring to the current latitude, then by aligning the vertical ring north-south you are creating a small model of the Earth, aligned in the same orientation. The sliding pinhole represents the varying height of the noon Sun throughout the year.

[@Ameto]

Indeed, the knob is used to adjust the thickness of the line drawn, not to hold a quill tip in place.

[@jaystevens137]

You're right, but, sigh... that's "what" it's supposed to look like, or that's how it's supposed to look. I don't know why people insist on mashing the two phrases together.

[@CristiNeagu]

jaystevens137 Fair enough. That's how i've always said it. Thanks for correcting me.

[@EGarrett01]

You might want to spend more time learning to speak English and less time studying obsolete technology, idiot.

[@kaya_y.]

Scientists are borderline religious about Newton. You've got shelves of relics.

[@Vardagaladhiel]

That letter plate was definitely my favourite object as I write a LOT of letters for my job, and how cool would it be to receive a beautifully printed letter (especially if it was to make you a fellow of the Royal Society)! Dr Fransen was really interesting, and that illustration was beautiful even if it was a rats testicle!

[@Sam-lr9oi]

Wow an old school form letter! That's a neat one.

[@keithlightminder3005]

No need for goose feather, the narrow space would use surface tension to hold ink, and touching the paper would gradually let it deep out at the point of contact.

[@kang_min_nal_ra]

Such beautiful accent, 80% British, 20% foreign.

[@willemvanoranje1533]

20% Dutch

[@TheyCallMeNewb]

Received with great esteem, the estimable Brady. This guest had a most unusual confluence of accents.

[@miekekuppen9275]

Dutch people usually get taught kind-of-British accents in school so the combination is pretty common.

[@FlyingSavannahs]

On the printed sundial, the "stand" that is suggested would make the shadow is called a gnomon.

[@blakedurrant9399]

Keiths Choice?! I wont stop.

[@woutervanr]

Dr Sietske has a Dutch name and seems to be dutch as well if you listen how she pronounces some words (e.g. London). This means there is a chance for me to visit the Royal Society sometime in the future :)

[@Crusher8000]

Dutch or Belgian?

[@woutervanr]

@@Crusher8000 She or me? I'm Dutch and I'm guessing Sietske is a Frisian name.

[@omikronweapon]

Anyone can visit the Royal Society and even request to see whatever you want. Even the Dutch ;P I just wouldn't know what to ask for though. It also seems a bit silly to give it back after just five minutes and go "yeah, that was nice". I'd feel bad if I didn't actually study it.

[@tehjamerz]

"We think." Two seconds later: "absolutely!"

[@ky-gp4sz]

I love Sir Issac Newton’s objects!

[@TenzinLundrup]

That "egg" was probably an ellipse depicting the orbit of a planet.

[@tinnturps]

That pen is for doing straight lines

[@billyhendrix5544]

2:09 Brady burns newton

[@Allan_aka_RocKITEman]

*"MICKEY??!!"* - W.E. Disney 😂😂😂😂😂😂😂😂

[@celtgunn9775]

Just like I have told my children, if you ask a question, Always... ALWAYS expect me to answer honestly and in full. And if I don't know the answer, I will find it. If they truly don't want to know... then do not ask. At least then the Why stage became very short. 😆

[@metfan999]

Viewing this from Delft! Reinier de Graaf has schools named in his honor here.

[@DForce26]

And a hospital :P

[@CyanKash]

You can do it Brady

[@julessmith2]

That look of glee after she describes the rat's testicle!!!

[@iamTheSnark]

Sietske? And barely a trace of an accent. From Friesland, most likely. Good show.

[@Sage_the_Turt]

4:40 extremely relatable

[@SFKelvin]

It's not a compass - it's a combutt. One writes, the other doesn't.

[@ema_rem]

Hello, Brady!

[@4trym]

Beautiful sun clock, but the testicle robbed the show, never thought one would look that awesome.

[@ky-gp4sz]

Hello

[@ab1577]

She's so beautiful

[@JimFortune]

A flensed rat's testicle is her favorite image? I don't see it as a meme.

[@NATESOR]

SNEAKED?!?!!!

[@blueguitarbob]

Yes, of course Keith speaks Latin.

[@omikronweapon]

it's also the motto of the organization he works for... would be pretty bad if he didn't know it by heart.

[@scruffythejanitor1969]

If I emailed them in advance, would the Royal Society would let me, uh, fondle some history?

[@ΧρῆστοςΚωστελίδης-γ3φ]

WE WANT KEITH!!

[@calambrito07]

Not enough Keith 2-10

[@TulioSounds]

Her Dutch accent tough

[@lzeph]

Beautiful and melodic. Yes.

[@UCreations]

I've heard much worse.

[@willemvanoranje1533]

Not bad at all

[@pwnmeisterage]

17th century office supplies, lol.

[@xcapt-nemox3196]

Just two doctors talking about gentleman's apparel.

[@AaronHollander314]

One thumbs down...touche Keith

[@officialshutterfly]

No Keith... Zzz...

[@holdmybeer]

get a room you two. :D

[@ScottTilYouDrop]

❤❤❤

[@omikronweapon]

The ultimate feminist's answer XD "The picture with the mutilated testicle, of course" :P

[@LlewelynReswald]

She’s beautiful