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An electromagnetic method used in mineral exploration in which a
high-frequency current is used, ranging from 30,000 to 50,000 Hz, but, if
necessary, a frequency as low as 50 to 3,000 Hz, can be made available.
The detecting or direction-finding coil, mounted on a tripod, has the form
of a pair of spectacles and is equipped with an amplifier and head
telephone. When the exciting coil is energized, a current is caused to
flow in the conductor and a secondary electromagnetic field is set up
around the conductor. The detecting coil is affected by both the primary
field from the exciting coil and the secondary field. Lewis
Source:
Dictionary of Mining, Mineral, and Related Terms
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