These are very short: only 5 seconds long. If you don't know how to play them, see the instructions at the bottom of the page.
This is a close-up video of a student sqeezing and releasing the bottle, causing it to sink and rise.
Here is another close-up video, this one quickly squeezing and releasing the bottle 4 times so the bottle goes up and down only a little. If you look closely right above the paper clips, you can actually see the air inside the straw compressing as the water level in the straw rises.
Go to the Cartesian Diver introduction page.
Back to the Science Toy Maker homepage.
If you have a fast internet connection, you should be able to simply point and click to play the short MPEG movie. If the picture is halting the first time through, click play on your media player and it ought to play smoothly the second time.
You will almost certainly have to hit play a second time if you have a dial-up internet connection. If you still can't get it to run smoothly, you will have to right-click, then "save file as..." or something similar to that. Take note of where you are saving it. They are short and highly compressed, so they won't take long to load. Even with a fast connection, save the file like that if the picture is jerky. To play the file, find it and double-click on it. It will play in the default media player.