This Four-Ton Steel Ball Helps Calibrate Seismographs
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How do you know if your earthquake detector works? Well, creating an artificial quake is one way to check...
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Fecha: February 12, 2018 at 05:02PM
via Digg Histories: http://digg.com/video/four-ton-ball-seismometer-check-germany?utm_source=ifttt
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