File:Wired monitor.jpg

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Wired_monitor.jpg ‎(260 × 176 pixels, file size: 23 KB, MIME type: image/jpeg)

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Description
English: Electronic crack monitor and survey targets are shown installed on an existing wall. The crack monitor feeds movement data to a laptop computer. The targets are aligned and measured with optical survey equipment to determine the degree and direction of movement.
Date Unknown date
Unknown date
Source http://www.nps.gov/hps/tps/technotes/PTN42/monitor.htm
Author McMullan and 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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current15:45, 20 April 2010Thumbnail for version as of 15:45, 20 April 2010260 × 176 (23 KB)Preservapedia (talk | contribs){{Information |Description={{en|1=Electronic crack monitor and survey targets are shown installed on an existing wall. The crack monitor feeds movement data to a laptop computer. The targets are aligned and measured with optical survey equipment to determ

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