Seismograph Model

I was hoping a small battery operated motor which would pull the paper at a certain rate. When you are truly observing a scientific experiment the human element must not be in the equation. A student pulling on the paper will change by the person in the experiment and frequency will be a constant instead being uniform during the experiment. A graph roll and a small rev engine will make the experiment a more knowledgeable experience.

Poorly designed and did not come with a stylus.

Worked just fine. Perfect for my daughter's science project.