Seismograph

Seismograph is an instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake.

http://www.youtube.com/watch?v=83GOKn7kWXM

Bibliography:

http://www.youtube.com/watch?v=83GOKn7kWXM

http://www.answers.com/topic/seismograph

http://www.cartage.org.lb/en/themes/Sciences/Earthscience/Geology/Earthquakes/MeasuringEarthquakes/Seismographs/Seismographs.htm

Beatriz Aznar Jarque 4ºA

 

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