Log in

No account? Create an account

Previous Entry | Next Entry

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 vibration (2)

after vibration (2)

before vibration (3)

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.


( 21 comments — Leave a comment )
Apr. 6th, 2017 07:47 pm (UTC)
That is fascinating!
Apr. 6th, 2017 07:49 pm (UTC)
I had never seen it before, so when the couscous suddenly moved into the beautiful pattern, I was amazed! Truly magical.
Apr. 6th, 2017 07:53 pm (UTC)
I've seen it a couple of times--amazing!
Apr. 6th, 2017 10:32 pm (UTC)
At the MIT Museum, there is a kinetic sculpture that makes brownian motion with rice.
Apr. 6th, 2017 11:27 pm (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.
Apr. 6th, 2017 11:35 pm (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.
Apr. 7th, 2017 09:02 am (UTC)
I'd like to check them out too--I like the guy's manner of presentation!
Apr. 6th, 2017 11:42 pm (UTC)
Well done, Sophie.
Apr. 7th, 2017 09:01 am (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.”
Apr. 7th, 2017 12:59 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)
Apr. 12th, 2017 01:24 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!
Apr. 7th, 2017 12:54 am (UTC)
haha the couscous experiments! Love it!
Apr. 7th, 2017 08:52 am (UTC)
Apr. 7th, 2017 01:04 am (UTC)
Wow! That is fascinating! Thanks for sharing.
Apr. 7th, 2017 08:52 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!
Apr. 7th, 2017 01:05 am (UTC)
that's really cool!
Apr. 7th, 2017 08:51 am (UTC)
I think so too--SCIENCE! It's for all of us.
Apr. 7th, 2017 03:26 am (UTC)
Really interesting video - thanks! (Your experiments are also cool.)
Apr. 7th, 2017 08:50 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.
Apr. 9th, 2017 06:08 pm (UTC)
Very cool!
Apr. 12th, 2017 05:14 pm (UTC)
Tuneful design :-)
( 21 comments — Leave a comment )

Latest Month

December 2018


Powered by LiveJournal.com
Designed by Paulina Bozek