File:Seismograph recording vibrations.jpg

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Seismograph_recording_vibrations.jpg ‎(200 × 243 pixels, file size: 29 KB, MIME type: image/jpeg)

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English: seismograph records vibrations transmitted at the ground level of an historic building. The instrument is wired to a light and siren designed to warn the excavation crew that vibration levels are approaching preset limits. Additional sensors are often installed in the basement and on sensitive features such as stained glass windows.
Date Unknown date
Unknown date
Source http://www.nps.gov/hps/tps/technotes/PTN42/monitor.htm
Author Wilson, Ihrig & Associates, Inc.
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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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current15:43, 20 April 2010Thumbnail for version as of 15:43, 20 April 2010200 × 243 (29 KB)Preservapedia (talk | contribs){{Information |Description={{en|1= seismograph records vibrations transmitted at the ground level of an historic building. The instrument is wired to a light and siren designed to warn the excavation crew that vibration levels are approaching preset limit

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