The seismometer is a device that you put in the ground. It has a lot of circuitry that can detect shivers and shakes in the earth and it sends signals to a computer that tell it if there is going to be an earthquake and if there is, how bad it is going to be. A seismograph is different from a seismometer. A seismograph is set on the ground instead of in the ground. A seismograph has a metal frame and hanging from the top of the frame hangs a pendulum with a pen on the bottom of the pendulum that writes on a roll of paper. If the earth shakes then so does the pendulum which makes the pen scribble on the paper. When someone checks it they would see if there is going to be an earthquake.
School Essays 