Comments (13)

By Mom Unplugged, October 16, 2009 5:03 pm

The theme for this week’s Unplugged Project was wheel. I searched around for ideas and came up with this one which sounded really interesting: a zoetrope!

What is a zoetrope you ask? (I didn’t know what it was either.) A zoetrope works on the same principle as a flipbook, one of those little books where you flip the pages and it looks like an image is moving, but it uses a rotating cylinder to produce the illusion of movement.

I like this definition from Wikipedia: “A zoetrope is a device that produces an illusion of action from a rapid succession of static pictures.” The word zoetrope comes from the Greek zoe (life) and trope (turn), so it is really a “wheel of life,” perfect for our theme!

I found instructions for making a zoetrope many different ways: using a round camembert cheese box, a PVC pipe, a straw and a printout, a paper plate, and ice cream containers. We originally made up our own version out of black poster board, an old CD, a small lazy susan, and lots of tape. It was OK, but a bit wobbly.

Then I found a totally ingenious person who made one out of a salad spinner! Why didn’t I think of that? We absolutely had to try it and the result was AWESOME! It is an easy project that produces a maximum “wow factor.” Try it, here’s how:

Use electrical tape to tape off the slits on the salad spinner basket leaving every third slit open. We used 3/4″ electrical tape and that just happened to be exactly the right size for the job.

For images, the salad spinner genius used cutouts of the phases of the moon from a calendar. Very clever but I decided to draw my own pictures.

On a piece of white paper I marked off a series of 3/4″ x 3/4″ squares.

Then, using a black Sharpie, I drew a face with a changing mouth and waving hair, making each image slightly different than the previous one.

The tedious part was cutting out all 26 images and taping them in sequence to the blocked off areas of the inside of the salad spinner.

Finally, using a clump of rolled up tape, stick your zoetrope onto the overturned lid of the salad spinner, centering it as best you can. The zoetrope will be sitting on the rotating disk, and the salad spinner handle will be underneath.

Now for the fun: spin and look through the slots to see the “movie!” The view is best if you shine a bright light into the bowl of the zoetrope.

Hopefully you’ll see from this little 10 second video that we made, how cool this project really was!

Let’s not forget THE SCIENCE:

So how do flipbooks, zoetropes, thaumatropes (a rotating card with a different picture on each side, the pictures appear to combine when card is spun), cartoons, and old time film movies actually work? Many people still believe in the “persistence of vision” theory, in which it is thought that an image remains in the eye for a certain time after the image source is actually gone (ie. the optic nerve is the cause). Apparently that theory is no longer in favor these days. A more popular theory at the moment involves something called Beta movement where the brain itself apparently combines rapidly flashing images thus forming a perception of movement (ie. the brain is the cause). It seems that no one really understands any of this completely, but here are a few informative links if you are interested:

The Myth of Persistence of Vision, by Joseph and Barbara Anderson

Lectures: Visual Perception 8 - The Moving Image

FIELD TRIP:

You can visit a real zoetrope at the following museums:

V&A Museum of Childhood, London, UK

The Ghibli Museum, Tokyo, Japan

Great Lakes Science Center, Cleveland, Ohio, USA

Headwaters Science Center, Bemidji, MN, USA

Have fun!

(Be sure to visit the links to other people’s wheel Unplugged Projects on last Monday’s Weekly Unplugged Project post.)

Comments (5)

By Mom Unplugged, October 12, 2009 8:00 am

The theme for this week’s Unplugged Project is wheel.

We are in Albuquerque for the long holiday weekend, but we did do a wheel Unplugged Project. I of course forgot to pack my camera cable, so photos (and my post) will have to wait until mid-week when we are home again. I think this is kind of a cool one, so be sure to check back later in the week to see it!

(October 16th NOTE: My post is up now, we made a salad spinner zoetrope!)

I did want to get the Linky up now though for anyone else who is ready to link to their wheel Unplugged Project.

If you didn’t do a wheel project, then please don’t link but feel free to read more about how the Unplugged Project works here. We’d love to have you join us!

The theme for next week’s Unplugged Project will be another really loose one:

The Letter B

Please join us!

(Photo: Ferris Wheel at Kasai Rinkai Park, Tokyo - from Wikipedia, view license information here.)

++++++++++

Comments (8)

By Mom Unplugged, October 4, 2009 8:35 pm

The theme for this week’s Unplugged Project was weather and the weather today was windy, VERY windy. We decided to try making a homemade anemometer (device that measures wind speed) with the instructions that I found here.

You’ll need some stiff, corrugated cardboard, four small Dixie-type paper cups, a long sharp pencil with eraser, a stapler, scissors, a push pin and some modeling clay.

First cut the small rims off the paper cups using the scissors.

Next cut the cardboard into two strips of equal length. Staple them together in the form of a cross.

Color one cup a different color. Red or something bright would be easier to spot, but all we could find that would work on the waxy surface of the cup was a black Sharpie.

Find the exact center of your cross by drawing an “X” between the corners of the center portion like this:

Where the lines cross is the center and is where you will put your thumb tack. (NOTE: This step is easiest to do before you attach the cups).

Staple a cup to the end of each cardboard strip. Make sure they are all facing the same way and are aligned perpendicular to the cardboard strips.

Push the pin through the center of the cross and into the eraser of the pencil.

Take your anemometer outside and stick it to a porch railing or table in a base made out of modeling clay.

Your anemometer should now spin in the wind! (*SHOULD* - read note below!)

To check the speed, count the number of times the colored cup passes by you in one minute. Obviously the more times it swings by, the faster the wind. You can measure at different times of day to compare the wind speeds.

If you want to get really scientific you can calibrate your anemometer using your car. Read the clever instructions for how to do it here.

* NOTE* - We discovered that although it was a very, very windy day out (55 mph gusts), the gusts were so variable in strength and direction that our anemometer didn’t spin very well (but it did blow off the railing once or twice!).

It worked much better inside with human-generated wind as you can see here in this very primitive video! (PS. Please ignore my messy house):

++++++++++

If you joined in this week’s weather Unplugged Project, please link to your project post (not just your blog - we always want to be able to find your post) in the Linky below. If you didn’t join in the Unplugged Project but think you might like to in the future, read more about how to participate here. We’d love to have you!

++++++++++

The theme for next week’s Unplugged Project will be:

Wheel

I must be in a “W” phase at the moment. I hope to see you next week!

++++++++++

Comments (4)

By Mom Unplugged, September 28, 2009 2:28 pm

This isn’t our usual artsy/craftsy Weekly Unplugged Project, but that’s what’s fun about the Unplugged Project, it can be ANYTHING! A last minute decision to spend the weekend in Phoenix (108 degrees by the way, ouch!) necessitated a change in our original plan.

Since the theme for this week’s Unplugged Project was simply The Letter J, our project became joy.

This water slide was joy, pure and simple.

++++++++++

If you did a Letter J Unplugged Project this week, then thank you and please link to your project post in the linky below. If you did not join in but would like to learn how, then I invite you to read more here. We’d love to have you!

++++++++++

The theme for next week’s Unplugged Project will be:

Weather

Enjoy!

++++++++++

Comments (2)

By Mom Unplugged, September 24, 2009 8:12 pm

9 year-old daughter using the turkey quill pen and sepia ink.