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inspired by a chladni plate experiment

In this video, a guy pours couscous over a plate and plays the edge of the plate with a bow to make musical vibrations, which then causes the couscous to move into beautiful patterns.




This inspired me to try similar, except I don't have a thin metal plate or a bow--or, right at the moment, couscous. What I do have is a cookie sheet, rice, and a saw. So!

Here's the rice on the cookie sheet:

random rice

Here it is after I shook the tray back and forth. The way I was shaking it, the rice all clustered together like a murmuration of starlings:

rice when I've shaken the sheet

Here's a roll of duct tape on the floor. I'm going to set the tray on it and then bang the saw over the top of the tray:

base for the sheet, plus saw

Here's the tray in place ...

sheet on the base

And here's how I'm going to bang the saw:

how I'm going to vibrate the sheet

And here are the first results!

after vibration (1)

Not exactly symmetrical, but still very interesting! The rice collects where the sheet is *not* vibrating.


before
before vibration (2)

after
after vibration (2)

before
before vibration (3)

after
after vibration (3)

I am so science!!







This entry was originally posted at http://asakiyume.dreamwidth.org/846466.html. Comments are welcome at either location.

Comments

( 21 comments — Leave a comment )
sartorias
Apr. 6th, 2017 10:47 pm (UTC)
That is fascinating!
asakiyume
Apr. 6th, 2017 10:49 pm (UTC)
I had never seen it before, so when the couscous suddenly moved into the beautiful pattern, I was amazed! Truly magical.
sartorias
Apr. 6th, 2017 10:53 pm (UTC)
I've seen it a couple of times--amazing!
yamamanama
Apr. 7th, 2017 01:32 am (UTC)
At the MIT Museum, there is a kinetic sculpture that makes brownian motion with rice.
asakiyume
Apr. 7th, 2017 02:27 am (UTC)
I had to go to google to find out what Brownian motion was--I got a Youtube video narrated by a guy with a South Asian accent: he explained it perfectly, and now I know.
queenoftheskies
Apr. 7th, 2017 02:35 am (UTC)
I showed my oldest son the video you posted and he knew all the physics of it.

He's going to check out more of that person's videos.
asakiyume
Apr. 7th, 2017 12:02 pm (UTC)
I'd like to check them out too--I like the guy's manner of presentation!
oiktirmos
Apr. 7th, 2017 02:42 am (UTC)
Well done, Sophie.
asakiyume
Apr. 7th, 2017 12:01 pm (UTC)
rachelmanija told me about a great play, "Arcadia," by Tom Stoppard, which is in part about a young woman much like Sophie (at least, much like her in terms of scientific and mathematical determination and in lack of recognition). I think you would love the math aspects of it: Thomasina wants to know the geometry behind the entire world:
“The ordinary-sized stuff which is our lives, the things people write poetry about—clouds—daffodils—waterfalls—what happens in a cup of coffee when the cream goes in—these things are full of mystery, as mysterious to us as the heavens were to the Greeks.”
oiktirmos
Apr. 7th, 2017 03:59 pm (UTC)
That is a beautiful sentence.

Jonathan Edwards mused on the shapes of clouds having distinct boundaries.
A thing that I have not seen determined with respect to the clouds is their being terminated by such even and distinct bounds, especially in those clouds that we call thunder clouds. The clouds are nothing else but vapors that are drawn up from all parts of the sea and the earth; and one would think should be scattered everywhere in the air indiscriminately, so as to thicken the whole upper region of the air. Or if the air were thickened by them in one place more than another, by reason that a greater number of vapors are drawn off from some parts of the earth than other; yet, they flying loose in the air, one would think they should be terminated very gradually, growing thinner and thinner, by little and little, till at last it should be so thin that it cannot be discerned. But instead of that we see the clouds terminated by very distinct surfaces and bounds. They are extended thus far, and then cease at once, and all beyond is clear air. Sometimes, indeed, the air is so universally thickened, as when halos or perihelias appear, but afterwards these vapors gather into distinct heaps and thicker clouds.

He too was a kitchen scientist like his LiveJournal neighbor, A.
What is that reflection which we call a rainbow from? I answer, From the falling drops of rain. … And [I] can convince any man by ocular demonstration in two minutes on a fair day that the reflection is from drops, by only taking a little water into my mouth, and standing between the sun and something that looks a little darkish, and spirting of it into the air so as to disperse all into fine drops; and there will appear as complete and plain a rainbow, with all the colors, as ever was seen in the heavens.


Edited at 2017-04-07 03:59 pm (UTC)
asakiyume
Apr. 12th, 2017 04:24 am (UTC)
I love his rainbow experiment! Brilliant! And his musings on clouds are lovely too.

Do you have these things in your memory from frequent reading of him? He really has a remarkable breadth of subject matter!
zyzyly
Apr. 7th, 2017 03:54 am (UTC)
haha the couscous experiments! Love it!
asakiyume
Apr. 7th, 2017 11:52 am (UTC)
:D
egg_shell
Apr. 7th, 2017 04:04 am (UTC)
Wow! That is fascinating! Thanks for sharing.
asakiyume
Apr. 7th, 2017 11:52 am (UTC)
My pleasure--I'm grateful to my Facebook friend (who is actually an LJ friend who is no longer on LJ) for sharing the video!
browngirl
Apr. 7th, 2017 04:05 am (UTC)
that's really cool!
asakiyume
Apr. 7th, 2017 11:51 am (UTC)
I think so too--SCIENCE! It's for all of us.
steepholm
Apr. 7th, 2017 06:26 am (UTC)
Really interesting video - thanks! (Your experiments are also cool.)
asakiyume
Apr. 7th, 2017 11:50 am (UTC)
My results would provoke ??? on their own. ("Okay--the rice is one place at first and then afterward it's somewhere else...so what?") But when you see that video, and you what a better-controlled vibration can do--it's so cool! I was surprised by how *complicated* the couscous patterns were.
khiemtran
Apr. 9th, 2017 09:08 pm (UTC)
Very cool!
asakiyume
Apr. 12th, 2017 08:14 pm (UTC)
Tuneful design :-)
( 21 comments — Leave a comment )

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