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torsion seismometer

Seismometer — Seismometers (from Greek Seism the shakes and Metro I measure ) are instruments that measure and record motions of the ground, including those of seismic waves generated by earthquakes, nuclear explosions, and other seismic sources. Records of… … Wikipedia
Seismic scale — A seismic scale is used to measure and compare the severity of earthquakes. (For a quick review, see the table of seismic scales at the end of this article.)Two fundamentally different but equally important types of scales are commonly used by… … Wikipedia
Measuring instrument — Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea … Wikipedia
Richter magnitude scale — Part of a series on earthquakes Types Foreshock • Aftershock • Blind thrust Doublet • Interplate • … Wikipedia
Horizontalpendel — (Pendelwage), ein 1831 von Hengler in München erfundener Apparat zum Nachweis und zur Messung kleiner Kräfte, die eine Veränderung in der Lage der Lotlinie hervorbringen. Das H. geriet in Vergessenheit und wurde erst 1862 von Parrot in Paris und… … Meyers Großes Konversations-Lexikon