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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

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