from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument that automatically detects and records the intensity, direction and duration of earthquakes and similar events.
from the GNU version of the Collaborative International Dictionary of English
- n. An apparatus for registering the shocks and undulatory motions of earthquakes.
from The Century Dictionary and Cyclopedia
- 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)
From seismo- + -graph. (Wiktionary)