Recorder: How Does a Seismograph Record the Magnitude of an
Earthquake?  based on 2 ratings Author: Janice VanCleave   How
does a seismograph record the magnitude of an earthquake?     •
Cardboard box, measuring about 12 inches (30 cm) on each side
• Scissors   • Ruler   • Adding-machine paper   • String   •
Sharpened pencil   • 5-oz (150-ml) paper cup   • Masking tape
• Black marking pen   • 5 ounces (150 ml) small rocks   •
Modeling clay   • Adult helper     1. Ask an adult to prepare
the box as follows:         • Cut the lid off the box, then turn
the box on its side so that the opening faces outward.     • Cut
a 2-inch (5-cm)diameter hole in the center of the top of the
box.     • Cut two 1/2by-4-inch (1.25-by-10-cm) slits in the
box. Make the first slit in the center of the bottom, near the
opening. Make the second slit, in line with the first slit, in
the back of the box.   2. Cut a 24-inch (60-cm) section of
addingmachine paper.   3. Thread the strip of paper through the
slits in the box so that ab