Listen to Saroja Audio Songs at MusicMazaa.com

Sunday, October 19, 2008

SEISMOGRAPH

Seismograph is an instrument for detecting, measuring and recording seismic waves emitted by earthquakes or explosions. It is also called a seismometer. It is composed of a rigid frame which is fixed in the earth, a chart attached to the frame, a mass suspended from a spring or pendulum, a pivot which restricts motion to one direction only and a pen connected. to the mass