The Ewing Seismograph
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The Ewing seismograph, constructed to record all three movements. Three pendulums are arranged to swing in the manner of a bracket or a gate, in three planes, at right angles to one another. Two of them are placed vertically and oscillate in a horizontal manner.
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EarthquakesSource
Amadeus W. Grabau A Textbook of Geology (Boston: D.C. Heath & Co., 1920) 659
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