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Reference.org
Turam method
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<p>The Turam method is one of the oldest <a href="/facts/Exploration_geophysics/oTjxPGr1">geophysical</a> <a href="/facts/Electro-magnetic/oAkmALHT">electro-magnetic</a> methods used for <a href="/facts/Mineral_exploration/VEAosBGK">mineral exploration</a>, devised by Erik Helmer Lars Hedstrom in 1937. Its name is derived from Swedish "TU" (two) and "RAM" (frame), referring to the two receiving coils. </p>