Explore how seismographs are made, and how accurate they can be: Tech Museum

Click "next" in the upper right corner of these Web pages to find out what a seismograph is, what seismographs looked like a long time ago, how 19th century models worked, how electricity changed seismographs, and what today's seismographs can do.

Then, choose a seismograph from the Web pages you have seen and write a paragraph describing what it was made of, how it worked, and how effective it was.