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Geophysical Survey
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The measuring and recording of electrical resistivity or magnetism in order to determine the existence and outline of buried features such as walls and ditches. Geophysical techniques include resistivity survey, magnetometer survey and ground penetrating radar.
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SITE *
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Unclassifiable site with minimal information. Specify site type wherever possible.
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BRIDGE *
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A structure of wood, stone, iron, brick or concrete, etc, with one or more intervals under it to span a river or other space. Use specific type where known.
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GUN EMPLACEMENT *
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A fortified site in which a gun, mortar or cannon is positioned.
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* Copyright of English Heritage (1999)