Seismograph
By: MMB
A seismograph is an earthquake detector. When there is an earthquake the seismograph detects the earthquake and tells how big the earthquake is. The seismograph was invented in China by a man named Choko in 136 A.D.
Work Cited: What is a Seismograph? The
Tech. 11 Nov. 2002 <http://http://www.thetech.org/exhibits/online/quakes/seismo/>.
