Richter scales measure earthquakes by numbers. Richter scales are measured from one to nine. Earthquakes that rate a nine on the Richter scale are very big, and earthquakes that rate a one on the Richter scale are sometimes not felt by people. On a Richter scale an earthquake that is rated a two is 32 times bigger than an earthquake that is rated a one.
Seismographs are scrolls of a paper that move during an earthquake.
Each Seismograph has a pen that stands by it on a stand. The pens do not move during an earthquake, but the scroll does so it is possible to record the movement of an earthquake. To make the rating seem more realistic, try drawing stripes on the paper, up and down, as well as back and forth. This will make a shaking sort of motion on the paper. When the scroll is filled up, you will have an seismograph rating.