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

n. An instrument that automatically detects and records the intensity, direction and duration of earthquakes and similar events.

n. An apparatus for registering the shocks and undulatory motions of earthquakes.

n. Same as seismometer (which see).

n. See seismometer. A great variety of apparatus has been devised for recording earthquake phenomena, of which that perfected by Omori is used in Japan, that of Milne is established at about fifty British and international stations, and that known as the Bosch-Omori, improved by Marvin, is used at about thirty American and German stations. All these are adaptations of the horizontal pendulum at first used by Zollner in 1860 to investigate changes in terrestrial gravity, and they record the horizontal movements of the ground at great distances from the origin of the earthquake. A very different apparatus for this purpose is the inverted vertical pendulum devised by Wiechert (see seismometer) and greatly improved by Marvin at Washington. No apparatus for recording vertical movements of the ground and none for recording the largest movements near the epicenter have as yet been successful.

n. a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)

"The point we are making here is that if we regard the equity markets as a long-term seismograph of the economy, then so far, despite all the storm and stress, the markets - and therefore the economy - remain within the general pattern of the 2000-2002 market at the 2001 recession."

measuring device    measuring instrument    measuring system   

kreil's seismograph    pendulum seismograph    mallet's seismograph   

seismogram   

references/suggested    helmet-like    fifty-five-gallon    tone-arm    benchtop    fire-fighting    altimeter    darning    tachometer    nationally-recognized