Muck Monsters: Science Sunday:Homemade seismograph
Here's how ours turned out:
I installed it on a bookshelf near the floor in my room. This morning I looked at the paper, and started to get excited when there were patterns on the page. Then Hubby told me Mister Two had been playing with it. I put a fresh sheet of paper down.
Then tonight when I was working on my housekeeping accounts I suddenly found myself diving under the desk (again) as the house shook around me. When my hands stopped shaking and my heart stopped pounding and I finished posting expletives on facebook, I went to check the trace.
It came out smaller than I expected. It's been quite tricky to get enough pressure on the pencil so the pendulum will swing freely but still leave a line on the paper. But still, here's a work of art by the earth.