- The supposed detection of subsurface features by employing a twig, copper rod, pendulum, or other instrument. Discontinuous movements in these instruments are believed by some to record the existence of buried features.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Event Types Thesaurus)
- http://www.english-heritage.org.uk (FISH Event Types Thesaurus)
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