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JSFolk · 6th May 2004, 03:08 PM

This is just too cool for words...

http://chaos.ph.utexas.edu/research/...cornstarch.htm

Watch the video.

"Vibrated shear thickening fluids"

gmanontario · 6th May 2004, 03:37 PM

That video is typical of my reasoning that the real world is far more mysterious and fascinating than anything the woo-woo brigade can make up.

Fantastic stuff!! Thx for the link...

The Bad Astronomer · 6th May 2004, 05:37 PM

I saw that video earlier today. The last "scene" was... astonishing. My mouth literally hung open. I have never seen anything so odd in a long, long time. What could possibly cause that behavior in a viscous liquid? It is so bizarre! I hope they can figure it out soon.

garys_2k · 6th May 2004, 07:39 PM

It keeps timing out for me, I'd bet the server's getting pounded.

Oh, I got it! WOW!

roger · 6th May 2004, 07:49 PM

Has anyone played with cornstarch and water mixes? It's wild stuff. It behaves as both a solid and liquid. For example, scoop some up in a spoon and pour it out. It acts like a liguid. But reach out to the pour and you can snap a piece off.

Hit it, and it's a solid. Push into it slowly, and it's a liquid.

I assume that it is this property being manifested by the vibrating plate. Of course, I am probably completely wrong.

JSFolk · 6th May 2004, 08:15 PM

That video made it to the Fark home page, so no doubt the server is getting hammered. (25,000 hits as of my typing this)

The video has been mirrored here...

http://www.politicalanalyst.net/cornstarch.wmv

And, in case you have a mosquito problem, you could try this...

http://www.tompowered.com/stuff/flamethrower.mpg

Zep · 6th May 2004, 08:54 PM

Wow! It's so freaky it must be SATAN at work!

Correa Neto · 6th May 2004, 09:08 PM

A loooong time ago I was working with tectonic deformation and magma chambers. According to the papers I read in these past times, experiments showed that a mixture of solid+liquids, when the crystals managed do create a continuous network (80% crystals? I don´t remember, I´m typing from memory) was able to transmit shear stresses quite like a solid. Could this be of any help?

edited to add Oh, and viscosity and deformation rate also played a role. end edit

uruk · 6th May 2004, 09:12 PM

Funk-a-delic!!!!!!

fishbob · 6th May 2004, 11:59 PM

The word of the day is thixotropy;
The property of certain gels of becoming less viscous when shaken or subjected to shearing forces and returning to the original viscosity upon standing. (dictionary.com)

SquishyDave · 7th May 2004, 03:08 AM

What the fudge monkey is going on here?

The end of that video looks like........ words fail, I think what is important here is how do I do this at home? I don't think I have a machine that will vibrate at a set frequency, curse it.

And even if I can't make the writhing mass of evil, I never got the recipie for corn starch and water to do the tricky liquid/solid thing, does anyone know it?

Edited to add, someone has to market this, put it in a glass dome, and you will have the next lava lamp, just pay me some royalties OK?

CFLarsen · 7th May 2004, 03:16 AM

Quote:

Originally posted by The Bad Astronomer
I saw that video earlier today. The last "scene" was... astonishing. My mouth literally hung open. I have never seen anything so odd in a long, long time. What could possibly cause that behavior in a viscous liquid? It is so bizarre! I hope they can figure it out soon.

I was thinking "THE BLOB!"

What struck me the most about the last part was: Where the heck does the energy come from, to keep the....commotion...going, and even grow? The vibrations?

I would love to hear John Edward's explanation of this. He claims spirits vibrate at a different frequency than living people...

CFLarsen · 7th May 2004, 03:24 AM

Quote:

Originally posted by SquishyDave
What the fudge monkey is going on here?

The end of that video looks like........ words fail, I think what is important here is how do I do this at home? I don't think I have a machine that will vibrate at a set frequency, curse it.

And even if I can't make the writhing mass of evil, I never got the recipie for corn starch and water to do the tricky liquid/solid thing, does anyone know it?

Edited to add, someone has to market this, put it in a glass dome, and you will have the next lava lamp, just pay me some royalties OK?

Yes, you are absolutely right: Marketing science "toys" is what we should look into. At TAMx, Jerry Andrus were selling (reasonably priced, too) some really cool things that would make your eyes pop. I've also had much success with getting weird gel, and stuff that behaves weirdly from science fairs and science centers. It's fun, educational, fun, and it makes you want to ask questions. And, it's fun!

Agammamon · 7th May 2004, 04:31 AM

And to make it more interesting, this sort of material has been developed to improve the capabilities of armor vests.
The kevlar fibers are impregnated with a STF. When hit it hardens briefly helping to distribute the impact over a wider area and then it softens back up.

Bottle or the Gun · 7th May 2004, 04:39 AM

Quote:

Originally posted by JSFolk
This is just too cool for words...

http://chaos.ph.utexas.edu/research/...cornstarch.htm

Watch the video.

"Vibrated shear thickening fluids"

Darn, the page and it's links doen't work.

specious_reasons · 7th May 2004, 06:27 AM

Quote:

Originally posted by Bottle or the Gun

Darn, the page and it's links doen't work.

It's been slashdotted (or Farked, as it were).

LucyR · 7th May 2004, 10:46 PM

I trust that I am a reasonable and patient person, but this thread is really the f**king limit.

I mentioned this phenomenon in a post to a thread on viscosity many months ago, and not a single person responded. I even included a recipe for making the damn stuff.

Furthermore, I started a thread a couple of weeks ago about a very interesting toy called the “rattleback”, which received only two replies. I wouldn’t be at all surprised if one of the “cool” people starts a thread on this very subject, and if they do I’ll bet my gun and dog that it receives a damn sight more replies than just two.

JSFolk · 8th May 2004, 12:16 AM

Yes, but did your pathetic post have a VIDEO?!?!

NO

So there.

CFLarsen · 8th May 2004, 01:49 AM

Quote:

Originally posted by LucyR
I trust that I am a reasonable and patient person, but this thread is really the f**king limit.

I mentioned this phenomenon in a post to a thread on viscosity many months ago, and not a single person responded. I even included a recipe for making the damn stuff.

Furthermore, I started a thread a couple of weeks ago about a very interesting toy called the “rattleback”, which received only two replies. I wouldn’t be at all surprised if one of the “cool” people starts a thread on this very subject, and if they do I’ll bet my gun and dog that it receives a damn sight more replies than just two.

No need to be angry. If I hadn't seen the video, I would not have believed a description of it.

Soapy Sam · 8th May 2004, 12:01 PM

Hmm. What's so surprising?

I guess I really AM the only drilling fluid engineer on this forum.

SquishyDave · 9th May 2004, 05:31 PM

Quote:

Originally posted by LucyR
I trust that I am a reasonable and patient person, but this thread is really the f**king limit.

I mentioned this phenomenon in a post to a thread on viscosity many months ago, and not a single person responded. I even included a recipe for making the damn stuff.

Furthermore, I started a thread a couple of weeks ago about a very interesting toy called the “rattleback”, which received only two replies. I wouldn’t be at all surprised if one of the “cool” people starts a thread on this very subject, and if they do I’ll bet my gun and dog that it receives a damn sight more replies than just two.

There there. Is there any chance of you reposting the recipe here? I would just look up your old thread, but it's clear more people will see it in this, more popular, thread

BlackBetta · 18th May 2004, 04:41 PM

bump

The video is back on the original site. Very interesting.

sorgoth · 18th May 2004, 05:09 PM

That's so cool!

Especially with the 'finger' structure spreading across the surface...wow.

Uh_Clem · 18th May 2004, 06:07 PM

Thanks for bumping this,

Amazing.......

The holes he made that stayed were pretty wild, but the weird, flailing alien-looking stuff at the end was just.....I've never seen anything like that.

WAY cooler than the Hutchison videos.

Soapy Sam · 18th May 2004, 08:19 PM

Roger said
"Has anyone played with cornstarch and water mixes? It's wild stuff. It behaves as both a solid and liquid. For example, scoop some up in a spoon and pour it out. It acts like a liguid. But reach out to the pour and you can snap a piece off.

Hit it, and it's a solid. Push into it slowly, and it's a liquid."
-----------------------------------------------------------------------
Roger- what you said applies to most things. Get the appropriate strain rate and almost anything will deform like a hot plastic. Take a look at folding in mountains for example. Or Lord Kelvin's Pitch Glacier at Glasgow university. Window glass measurably flows downhill. The starch mix is the other end of the strain rate scale. The thixotropic properties of non- Newtonian fluids have lots of industrial applications. (Drilling mud being one of the less exciting.)

http://www.ilanahalperin.com/new/nomadic_landmass.html

Martin · 18th May 2004, 08:20 PM

Quote:

Originally posted by Soapy Sam
Window glass measurably flows downhill

No, it doesn't.

JSFolk · 18th May 2004, 11:27 PM

You know, I had heard the glass flowing thing forever too.

Hmm. Too bad.

http://www.glassnotes.com/WindowPanes.html

baggie · 20th May 2004, 04:47 AM

Quote:

Originally posted by fishbob
The word of the day is thixotropy;
The property of certain gels of becoming less viscous when shaken or subjected to shearing forces and returning to the original viscosity upon standing. (dictionary.com)

sorry, that was yesterdays word. Todays word is actually "dilatency", which is what a cornstarch-water mixture is (and is the opposite of thixatropy).

see http://www.madsci.org/posts/archives...4863.Ch.r.html

Hand Bent Spoon · 21st May 2004, 02:02 AM

I thought you didn't like being in petri dishes anymore, Constable?

MRC_Hans · 21st May 2004, 02:58 AM

Mmm, we have a vibration table in our lab. I suppose those videos were made using a stroboscopic light? No problem we have that, too. For the home esperimenter, I suppose a loudspeaker, an amplifier, a disco strobe light, and a tone generator would do the trick-.

Hans

richardm · 21st May 2004, 03:42 AM

Quote:

Originally posted by MRC_Hans
Mmm, we have a vibration table in our lab. I suppose those videos were made using a stroboscopic light? No problem we have that, too. For the home esperimenter, I suppose a loudspeaker, an amplifier, a disco strobe light, and a tone generator would do the trick-.

Hans

I'm not sure you even need the strobe, Hans.

MRC_Hans · 21st May 2004, 04:22 AM

Well, at least to avoid blur I think I would. I notice the frequencies are not very high, so presumably the amplitude is considerable, enough to give a blurred image, even when viewing directly.

Hans

Smike · 21st May 2004, 04:44 AM

I think I looked at something like this in a physics lesson. What was it now... ah, yes.

They used to think that light travelled through stuff like this, when they thought it was a wave. Clearly a wave needs stuff to travel through, and it must be very compact so it can travel fast. On the other hand, people could go through it without any obstruction. The solution is stuff like this!

If you're really interested in this theory, I think they called the stuff 'ether'.

P.S. Four uses of 'stuff' in a post. Not a good explanation.

6th May 2004, 03:08 PM	#1
JSFolk Critical Thinker Join Date: Nov 2001 Location: Calgary, AB, GWN Posts: 398	The most bizarre thing you'll see all week This is just too cool for words... http://chaos.ph.utexas.edu/research/...cornstarch.htm Watch the video. "Vibrated shear thickening fluids"

6th May 2004, 03:37 PM	#2
gmanontario Critical Thinker Join Date: Mar 2004 Location: Downtown Oakville ON Posts: 354	That video is typical of my reasoning that the real world is far more mysterious and fascinating than anything the woo-woo brigade can make up. Fantastic stuff!! Thx for the link...
	__________________ Energy can neither be created nor destroyed...it can only be wasted. Red Green

6th May 2004, 07:39 PM	#4
garys_2k Muse Join Date: Jan 2003 Posts: 756	It keeps timing out for me, I'd bet the server's getting pounded. Oh, I got it! WOW!
garys_2k Muse Join Date: Jan 2003 Posts: 756	__________________ - Gary

6th May 2004, 08:54 PM	#7
Zep Banned Join Date: Sep 2002 Posts: 26,985	Wow! It's so freaky it must be SATAN at work!
Zep Banned Join Date: Sep 2002 Posts: 26,985

6th May 2004, 09:08 PM	#8
Correa Neto Philosopher Join Date: Aug 2003 Location: Hunting rocks somewhere in Brazil Posts: 7,235	A loooong time ago I was working with tectonic deformation and magma chambers. According to the papers I read in these past times, experiments showed that a mixture of solid+liquids, when the crystals managed do create a continuous network (80% crystals? I don´t remember, I´m typing from memory) was able to transmit shear stresses quite like a solid. Could this be of any help? edited to add Oh, and viscosity and deformation rate also played a role. end edit
	__________________ Racism, sexism, ignorance, homophobia, intolerance, extremism, authoritarianism, environmental disasters, politically correct crap, violence at sport stadiums, slavery, poverty, wars, people who disagree with me: Together we can find the cure Oh, and together we can find a cure to religion too…

6th May 2004, 05:37 PM	#3
The Bad Astronomer Muse Join Date: Feb 2002 Location: Boulder Posts: 835	I saw that video earlier today. The last "scene" was... astonishing. My mouth literally hung open. I have never seen anything so odd in a long, long time. What could possibly cause that behavior in a viscous liquid? It is so bizarre! I hope they can figure it out soon.

6th May 2004, 07:49 PM	#5
roger Penultimate Amazing Join Date: May 2002 Location: Mountain View, CA Posts: 11,064	Has anyone played with cornstarch and water mixes? It's wild stuff. It behaves as both a solid and liquid. For example, scoop some up in a spoon and pour it out. It acts like a liguid. But reach out to the pour and you can snap a piece off. Hit it, and it's a solid. Push into it slowly, and it's a liquid. I assume that it is this property being manifested by the vibrating plate. Of course, I am probably completely wrong.

6th May 2004, 08:15 PM	#6
JSFolk Critical Thinker Join Date: Nov 2001 Location: Calgary, AB, GWN Posts: 398	That video made it to the Fark home page, so no doubt the server is getting hammered. (25,000 hits as of my typing this) The video has been mirrored here... http://www.politicalanalyst.net/cornstarch.wmv And, in case you have a mosquito problem, you could try this... http://www.tompowered.com/stuff/flamethrower.mpg

6th May 2004, 09:12 PM	#9
uruk Philosopher Join Date: Apr 2003 Location: In the land of the Shatner stealing Mexico touchers Posts: 5,313	Funk-a-delic!!!!!!

6th May 2004, 11:59 PM	#10
fishbob Seasonally Disaffected Join Date: Jan 2003 Location: Chilly Undieville Posts: 5,670	The word of the day is thixotropy; The property of certain gels of becoming less viscous when shaken or subjected to shearing forces and returning to the original viscosity upon standing. (dictionary.com)
	__________________ When you believe in things you don't understand, then you suffer . . . " - Stevie Wonder "Stupidity - a callow indifference to facts or data" - Stuart Firestein -neuroscientist. I hate bigots.

7th May 2004, 03:08 AM	#11
SquishyDave Graduate Poster Join Date: May 2003 Location: Canberra Posts: 1,644	What the fudge monkey is going on here? The end of that video looks like........ words fail, I think what is important here is how do I do this at home? I don't think I have a machine that will vibrate at a set frequency, curse it. And even if I can't make the writhing mass of evil, I never got the recipie for corn starch and water to do the tricky liquid/solid thing, does anyone know it? Edited to add, someone has to market this, put it in a glass dome, and you will have the next lava lamp, just pay me some royalties OK?
	__________________ Squishy doesn't irritate the hell out of me. - Quester_X

7th May 2004, 03:16 AM	#12
CFLarsen Penultimate Amazing Join Date: Aug 2001 Posts: 42,804	Quote: Originally posted by The Bad Astronomer I saw that video earlier today. The last "scene" was... astonishing. My mouth literally hung open. I have never seen anything so odd in a long, long time. What could possibly cause that behavior in a viscous liquid? It is so bizarre! I hope they can figure it out soon. I was thinking "THE BLOB!" What struck me the most about the last part was: Where the heck does the energy come from, to keep the....commotion...going, and even grow? The vibrations? I would love to hear John Edward's explanation of this. He claims spirits vibrate at a different frequency than living people...
	__________________ SkepticReport.com

7th May 2004, 03:24 AM	#13
CFLarsen Penultimate Amazing Join Date: Aug 2001 Posts: 42,804	Quote: Originally posted by SquishyDave What the fudge monkey is going on here? The end of that video looks like........ words fail, I think what is important here is how do I do this at home? I don't think I have a machine that will vibrate at a set frequency, curse it. And even if I can't make the writhing mass of evil, I never got the recipie for corn starch and water to do the tricky liquid/solid thing, does anyone know it? Edited to add, someone has to market this, put it in a glass dome, and you will have the next lava lamp, just pay me some royalties OK? Yes, you are absolutely right: Marketing science "toys" is what we should look into. At TAMx, Jerry Andrus were selling (reasonably priced, too) some really cool things that would make your eyes pop. I've also had much success with getting weird gel, and stuff that behaves weirdly from science fairs and science centers. It's fun, educational, fun, and it makes you want to ask questions. And, it's fun!
	__________________ SkepticReport.com

7th May 2004, 04:31 AM	#14
Agammamon Graduate Poster Join Date: Jan 2003 Posts: 1,385	And to make it more interesting, this sort of material has been developed to improve the capabilities of armor vests. The kevlar fibers are impregnated with a STF. When hit it hardens briefly helping to distribute the impact over a wider area and then it softens back up.
	__________________ It will be a great day when the US Air Force has all the bombs it needs and the NEA has to hold a bake sale in order to pay its lobbyists.

7th May 2004, 04:39 AM	#15
Bottle or the Gun Muse Join Date: Jan 2004 Posts: 890	Re: The most bizarre thing you'll see all week Quote: Originally posted by JSFolk This is just too cool for words... http://chaos.ph.utexas.edu/research/...cornstarch.htm Watch the video. "Vibrated shear thickening fluids" Darn, the page and it's links doen't work.
Bottle or the Gun Muse Join Date: Jan 2004 Posts: 890	__________________ It's "Lather, rinse, repeat", not "Lather, rinse, then there is divine intervention" - Don Life is inevitable because matter is self-organizing. A deity isn't necessary for a chemical reaction. - Don That's the biz, sweetheart. - Remo Williams

7th May 2004, 06:27 AM	#16
specious_reasons Graduate Poster Join Date: Jul 2002 Posts: 1,124	Re: Re: The most bizarre thing you'll see all week Quote: Originally posted by Bottle or the Gun Darn, the page and it's links doen't work. It's been slashdotted (or Farked, as it were).
	__________________ ta- DAVE!!!

7th May 2004, 10:46 PM	#17
LucyR Graduate Poster Join Date: Feb 2003 Posts: 1,086	I trust that I am a reasonable and patient person, but this thread is really the f**king limit. I mentioned this phenomenon in a post to a thread on viscosity many months ago, and not a single person responded. I even included a recipe for making the damn stuff. Furthermore, I started a thread a couple of weeks ago about a very interesting toy called the “rattleback”, which received only two replies. I wouldn’t be at all surprised if one of the “cool” people starts a thread on this very subject, and if they do I’ll bet my gun and dog that it receives a damn sight more replies than just two.
LucyR Graduate Poster Join Date: Feb 2003 Posts: 1,086

8th May 2004, 12:16 AM	#18
JSFolk Critical Thinker Join Date: Nov 2001 Location: Calgary, AB, GWN Posts: 398	Yes, but did your pathetic post have a VIDEO?!?! NO So there.

8th May 2004, 01:49 AM	#19
CFLarsen Penultimate Amazing Join Date: Aug 2001 Posts: 42,804	Quote: Originally posted by LucyR I trust that I am a reasonable and patient person, but this thread is really the f**king limit. I mentioned this phenomenon in a post to a thread on viscosity many months ago, and not a single person responded. I even included a recipe for making the damn stuff. Furthermore, I started a thread a couple of weeks ago about a very interesting toy called the “rattleback”, which received only two replies. I wouldn’t be at all surprised if one of the “cool” people starts a thread on this very subject, and if they do I’ll bet my gun and dog that it receives a damn sight more replies than just two. No need to be angry. If I hadn't seen the video, I would not have believed a description of it.
	__________________ SkepticReport.com

8th May 2004, 12:01 PM	#20
Soapy Sam NLH Join Date: Oct 2002 Posts: 25,929	Hmm. What's so surprising? I guess I really AM the only drilling fluid engineer on this forum.
Soapy Sam NLH Join Date: Oct 2002 Posts: 25,929

9th May 2004, 05:31 PM	#21
SquishyDave Graduate Poster Join Date: May 2003 Location: Canberra Posts: 1,644	Quote: Originally posted by LucyR I trust that I am a reasonable and patient person, but this thread is really the f**king limit. I mentioned this phenomenon in a post to a thread on viscosity many months ago, and not a single person responded. I even included a recipe for making the damn stuff. Furthermore, I started a thread a couple of weeks ago about a very interesting toy called the “rattleback”, which received only two replies. I wouldn’t be at all surprised if one of the “cool” people starts a thread on this very subject, and if they do I’ll bet my gun and dog that it receives a damn sight more replies than just two. There there. Is there any chance of you reposting the recipe here? I would just look up your old thread, but it's clear more people will see it in this, more popular, thread
	__________________ Squishy doesn't irritate the hell out of me. - Quester_X

18th May 2004, 04:41 PM	#22
BlackBetta Student Join Date: Nov 2001 Posts: 41	bump The video is back on the original site. Very interesting.
BlackBetta Student Join Date: Nov 2001 Posts: 41	__________________ I don't want to achieve immortality through my work. I want to achieve it through not dying. - Woody Allen

18th May 2004, 05:09 PM	#23
sorgoth Muse Join Date: Aug 2002 Posts: 977	That's so cool! Especially with the 'finger' structure spreading across the surface...wow.
sorgoth Muse Join Date: Aug 2002 Posts: 977	__________________ L'univers et moi, nous sommes seuls ensemble.

18th May 2004, 06:07 PM	#24
Uh_Clem Thinker Join Date: Apr 2004 Posts: 147	Thanks for bumping this, Amazing....... The holes he made that stayed were pretty wild, but the weird, flailing alien-looking stuff at the end was just.....I've never seen anything like that. WAY cooler than the Hutchison videos.
Uh_Clem Thinker Join Date: Apr 2004 Posts: 147	__________________ Do I really need a signature?

18th May 2004, 08:19 PM	#25
Soapy Sam NLH Join Date: Oct 2002 Posts: 25,929	Roger said "Has anyone played with cornstarch and water mixes? It's wild stuff. It behaves as both a solid and liquid. For example, scoop some up in a spoon and pour it out. It acts like a liguid. But reach out to the pour and you can snap a piece off. Hit it, and it's a solid. Push into it slowly, and it's a liquid." ----------------------------------------------------------------------- Roger- what you said applies to most things. Get the appropriate strain rate and almost anything will deform like a hot plastic. Take a look at folding in mountains for example. Or Lord Kelvin's Pitch Glacier at Glasgow university. Window glass measurably flows downhill. The starch mix is the other end of the strain rate scale. The thixotropic properties of non- Newtonian fluids have lots of industrial applications. (Drilling mud being one of the less exciting.) http://www.ilanahalperin.com/new/nomadic_landmass.html
Soapy Sam NLH Join Date: Oct 2002 Posts: 25,929

18th May 2004, 08:20 PM	#26
Martin Sceptic Join Date: Feb 2002 Posts: 898	Quote: Originally posted by Soapy Sam Window glass measurably flows downhill No, it doesn't.
Martin Sceptic Join Date: Feb 2002 Posts: 898	__________________ So the Universe is not quite as you thought it was. You had better rearrange your beliefs, then. Because you certainly can't rearrange the Universe. Isaac Asimov and Robert Silverberg, Nightfall

18th May 2004, 11:27 PM	#27
JSFolk Critical Thinker Join Date: Nov 2001 Location: Calgary, AB, GWN Posts: 398	You know, I had heard the glass flowing thing forever too. Hmm. Too bad. http://www.glassnotes.com/WindowPanes.html

20th May 2004, 04:47 AM	#28
baggie Scholar Join Date: Oct 2002 Location: cambridge Posts: 69	Quote: Originally posted by fishbob The word of the day is thixotropy; The property of certain gels of becoming less viscous when shaken or subjected to shearing forces and returning to the original viscosity upon standing. (dictionary.com) sorry, that was yesterdays word. Todays word is actually "dilatency", which is what a cornstarch-water mixture is (and is the opposite of thixatropy). see http://www.madsci.org/posts/archives...4863.Ch.r.html
	__________________ to every problem there is a simple solution - and it is usually wrong

21st May 2004, 02:02 AM	#29
Hand Bent Spoon Guest Join Date: May 2003 Posts: 378	? I thought you didn't like being in petri dishes anymore, Constable?
Hand Bent Spoon Guest Join Date: May 2003 Posts: 378

21st May 2004, 02:58 AM	#30
MRC_Hans Penultimate Amazing Join Date: Aug 2002 Location: Whithin earshot of the North Sea Posts: 16,604	Mmm, we have a vibration table in our lab. I suppose those videos were made using a stroboscopic light? No problem we have that, too. For the home esperimenter, I suppose a loudspeaker, an amplifier, a disco strobe light, and a tone generator would do the trick-. Hans
	__________________ Don't. Just don't.

21st May 2004, 03:42 AM	#31
richardm Philosopher Join Date: Aug 2001 Posts: 9,270	Quote: Originally posted by MRC_Hans Mmm, we have a vibration table in our lab. I suppose those videos were made using a stroboscopic light? No problem we have that, too. For the home esperimenter, I suppose a loudspeaker, an amplifier, a disco strobe light, and a tone generator would do the trick-. Hans I'm not sure you even need the strobe, Hans.
richardm Philosopher Join Date: Aug 2001 Posts: 9,270	__________________ Rimmer: Look at her! Magnificent woman! Very prim, very proper, almost austere. Some people took her for cold, thought she was aloof. Not a bit of it. She just despised fools. Quite tragic, really, because otherwise I think we'd have got on famously.

21st May 2004, 04:22 AM	#32
MRC_Hans Penultimate Amazing Join Date: Aug 2002 Location: Whithin earshot of the North Sea Posts: 16,604	Well, at least to avoid blur I think I would. I notice the frequencies are not very high, so presumably the amplitude is considerable, enough to give a blurred image, even when viewing directly. Hans
	__________________ Don't. Just don't.

21st May 2004, 04:44 AM	#33
Smike Innocent bystander Join Date: Jan 2004 Location: UK Posts: 2,111	I think I looked at something like this in a physics lesson. What was it now... ah, yes. They used to think that light travelled through stuff like this, when they thought it was a wave. Clearly a wave needs stuff to travel through, and it must be very compact so it can travel fast. On the other hand, people could go through it without any obstruction. The solution is stuff like this! If you're really interested in this theory, I think they called the stuff 'ether'. P.S. Four uses of 'stuff' in a post. Not a good explanation.
	__________________ 'As notable chicken superior court judge Sir Peckpeck Eatsbugs-Smythe once said, "the only thing we have to fear is space lizards with atom ray guns from beyond the moon." As true today as when it was said.' - TragicMonkey