Pitch: Making Guitars (Document)
RAY: "Dear ZOOM: I have something that's fun to make. It's a guitar. You will need an empty paper towel roll some rubber bands and an empty tissue box. Try it out. Teresa S., Wabasha, Minnesota.
ZOE: Here's how you make it. Cut a hole in the side of a box, like this. Then, take an empty paper towel roll and put it in the hole. This just makes it look like a guitar. Tape it down... Thank you, Ray. Then, take some rubber bands and put it around the box. Then try it out. (playing notes) Cool! (chuckles)
RAY: I think it makes the sound because the rubber bands vibrate.
RAY: And the humming of the rubber bands makes a sound.
RAY: See? You can see it vibrating too. That's awesome.
ZOE: If you pull the rubber bands tight...I'll just pull one while you pluck it. (notes change as rubber band is stretched)
RAY: A bit higher. Uh-huh. (deep tone plays)
RAY: That's cool. We also wanted to figure out what would happen if you made a guitar using boxes that had different shapes. Here's one we made earlier, with a cereal box. Let's see. (low tones playing)
RAY: Here's another one we made earlier using an oatmeal box.
ZOE: Shouldn't you try on this end? I think you can do both ends... yeah. Here, play this one. See if we can compare.
ZOE: Whoa! (high and low tones playing) That's much higher.
RAY: Yeah. I think it's higher because it's stretched...Right here it's stretched more. Because on this side...This is taller than that so the rubber bands have to go an extra distance to get over. And this one is really short right there. Yup. And I also think that it's... like...the two rubber bands on the ends are the lowest... (playing notes) because... it's a circle and at the top of the circle, it's higher...
ZOE: This is tighter.
RAY: It has to get stretched out at the top more than on the sides because it's...it reaches to the top and it's really high right there. And then it decreases— going down. So these two are lowest... (playing notes) and these two are highest.
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