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  • Destin: Alright, Keith. Prince Ruperts Drop.

  • Keith: Prince Ruperts drop (PRD), right.

  • K: Papers submitted from 1660 to the Royal Society, so this is the very early stuff.

  • D: Hey it's me Destin, welcome back to SED.

  • I am in the basement of the Royal Society in London, England,

  • and this is Keith, the head librarian,

  • and he has a special paper written by who?

  • K: Sir Robert Moray.

  • D: Ok, and it's about the PRD, right?

  • K: That's right, D: Can you show it to me?

  • K: Yep, so here we have an account of the glass drops by Sir Robert Moray.

  • D: Will you show me the drawing, the famous drawing?

  • K: So, if we just turn over the pages,

  • K: (reads) Solis a kingdom one and strong; but when the top is broken, shivers into men.

  • D: So the strength of the Prince Ruperts Drop (PRD) was recognised way back in the day

  • even at the beginning of the Royal Society. This is in the early years, right?

  • K: It is; in the 17th Century they were playing with PRDs, the early fellows fascinated by them.

  • D: They were fascinated back then; I'm still fascinated now,

  • but today we're going to use some of the best technology that we have available.

  • We're going to use a high-speed camera and record a bullet striking the bulb of a PRD

  • at several hundred thousand frames per second (fps).

  • Lets go get Smarter Every Day. -boop-

  • D: Alright, goggle up! Science is about to happen.

  • The first video made about the PRD here at 'Lookout Mountain Orbix Hot Glass'

  • was about why the PRD was so strong.

  • Today we're going to test the limits.

  • If you haven't seen that video you really need to watch it

  • because you have to understand what we're dealing with before this video will make any sense.

  • This is the setup: I've got a 22 rifle

  • aimed at a PRD.

  • I've got a high-speed camera right here,

  • this is a v2511, we're going to run it at over 100,000 fps.

  • So, I've got the rifle aligned so that we should hit the PRD

  • The resolution is going to be a little bit lower because that is what you have to do

  • in order to get so much speed, but is should be awesome.

  • Here we go. Get your goggles on. Lets Do it.

  • My PRD is wobbling,

  • so I have to time the bullet.

  • (gunshot)

  • (gunshot)

  • (gunshot)

  • Alright. Hopefully I got that.

  • (Music plays)

  • (Exuberant laughter)

  • The bullet did not break the PRD.

  • It looks like it creates a shockwave that runs down the tail,

  • and then the tail shakes, breaks, and then breaks it back the other way.

  • I'm going to do this several more times because that is beautiful.

  • That gun is pointed in the general direction of the high-speed camera,

  • so I'm a little nervous about that.

  • (Music resumes)

  • (gunshot)

  • Just make sure... everything looks good.

  • Click the high-speed [playback] now,

  • Gaaaaaaaah! It's awesome!

  • Hahahahaha!

  • Dang!

  • That is beautiful.

  • It's beautiful, and it's material science

  • and if those jokers back in the 1600s had this kind of technology

  • they would've written way more interesting letters to each other,

  • not that they didn't do a good job because they're awesome.

  • (gunshot)

  • (Music continues)

  • (gunshot)

  • Man this is just beautiful stuff.

  • (gunshot)

  • (gunshot)

  • (gunshot)

  • (gunshot)

  • (gunshot)

  • D: Where did that one go?

  • So there's a PRD in the yard and we don't know where...

  • That was a big one too.

  • Oh I see it, I see it.

  • Right there,

  • There it is! Hahahahaaha

  • No way!

  • I'm keeping this. Literally bullet-proof glass.

  • K: (reading)'When the top is broken, shivers into men.'

  • I think it's really cool that we have been fascinated by this little piece of glass for hundreds of years

  • and it's still fascinating. Like this video is amazing,

  • because we shot a bullet at a piece of glass and it didn't shatter.

  • That's amazing.

  • And it's, yeah, they were equally as... fascinating. Hello kitty cat,

  • -boop- Hey, before I show you that bullet mark on that PRD,

  • can we do something kind of strange?

  • Can I convince you to unsub from SED by clicking that button below to unsubscribe,

  • and then, if I've earned it,

  • please consider resubscribing and clicking the bell beside it to turn on notifications.

  • Subscriptions are different now and it would be awesome if you would turn on notifications

  • to actually be notified every time I upload a new video

  • If you're watching on your phone you can do the same thing in the app,

  • just resubscribe and click the bell. I would really appreciate that - if I've earned it.

  • Thank you so much for considering that.

  • Ok lets look at this PRD. There is actually a bullet imprint on this thing

  • which I find fascinating. A lot of people ask me if it's actually chips of glass they saw in the video.

  • It wasn't. That's actually lead; the bullet is shattering.

  • That's not glass fragmenting off. You can still see the impact of the bullet

  • on this PRD. It's really, really cool.

  • On the 2nd channel I shot some of the drops like this,

  • and got a li'l bit different results.

  • If you want to check out the other PRD footage that I didn't put in this video, that will be on the 2nd channel.

  • AD

  • If you would like to consider unsubscribing and resubscribing to SED and clicking the bell

  • or becoming a Patreon I would really appreciate it.

  • Gordon from 'A Shell in the Pit' made the audio and the music,

  • Brady got me access to the Royal Society to hang out with Keith,

  • His channel's called 'Objectivity'.

  • I'm Destin, and you're getting Smarter Every Day, have a good one. :)

Destin: Alright, Keith. Prince Ruperts Drop.

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子彈與魯珀特王子的落點在150,000 fps - Smarter Every Day 165 (Bullet vs Prince Rupert's Drop at 150,000 fps - Smarter Every Day 165)

  • 29 6
    Binyann 發佈於 2021 年 01 月 14 日
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