spring seismometer
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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
Ocean-bottom seismometer — (OBS) is a seismometer that is designed to record the earth motion under oceans and lakes from man made sources and natural sources … Wikipedia
Zhang Heng — For other uses, see Zhang Heng (disambiguation). This is a Chinese name; the family name is Zhang. Zhang Heng (張衡) Born … Wikipedia
Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… … Universalium
List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have … Wikipedia
Han Dynasty — 漢朝 ← 206 BCE–220 CE … Wikipedia
Timeline of historic inventions — The timeline of historic inventions is a chronological list of particularly important or significant technological inventions. Note: Dates for inventions are often controversial. Inventions are often invented by several inventors around the same… … Wikipedia
Timeline of Chinese history — History of China ANCIENT … Wikipedia
Lucien LaCoste — 1908 1995 was a prominent physicist, metrologist. He was coinventor of the modern gravimeter, invented the zero length spring, and vehicle mounted gravimeters. He was also co founder of a prominent company selling gravimetric instruments.LaCoste… … Wikipedia
Pendulum — This article is about pendulums. For other uses, see Pendulum (disambiguation). Simple gravity pendulum model assumes no friction or air resistance … Wikipedia
Venera 13 — Infobox Spacecraft Name = Venera 13 Caption = Venera 13 orbiter Organization = USSR Major Contractors = Mission Type = Flyby and Lander Satellite Of = Venus Flyby Date = March 1, 1982 Launch = 1981 10 30 at 06:04:00 UTC Launch Vehicle = Proton… … Wikipedia
