Conductivity Survey (Other Keyword)
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This report/manual focuses on the techniques and uses of the Conductivity survey, also known as the electromagnetic survey (EM) and how it measures the ability of the soil to conduct an electric current. The value, measured in siemens, is the reciprocal of resistivity (to convert to resistivity in ohm meters, divide the conductivity, in millisiemens per meter, into one thousand (Bevan 1983:51)). This said, there is considerable difference in the way earth conductivity and earth resistivity are...
Geophysical Investigations at Two Residences Associated with Ulysses S. Grant in St. Louis County, Missouri (2007)
The project consisted of geophysical investigations at the Hardscrabble residence (23SL1223) at the cemetery on St. Paul Churchyard and the Wish-ton-wish residence (23SL1222) on Anheuser-Busch’s Grant’s Farm. At Hardscrabble, the geophysical investigations included magnetic gradient, conductivity, and ground-penetrating radar surveys. A total area of 6,400 square meters was investigated including 4,800 square meters with fluxgate gradiometer, 2,000 square meters with a ground conductivity meter,...
Magnetic Gradient Survey of Seminoe's Fort on the Tom Sun Ranch Along the Oregon and California National Historic Trails, Natrona County, Wyoming (2002)
Seminoe’s Fort was a trading post along the California, Mormon Pioneer, and Oregon National Historic Trails near Devils Gate in southwestern Natrona County, Wyoming, which was used in various ways from 1852 to 1857. Over the decades since the abandonment and destruction of the fort, the exact location of the small trading post, designated 48NA288, was lost in the memory of the American people. The National Park Service’s Long Distance Trail Office in Salt Lake City requested the Midwest...