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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Metal_detector
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1992-09-04
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395b
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12 lines
A metal detector is an electronic device for
detecting metal, usually below ground,
developed from the wartime mine detector. In
the head of the metal detector is a coil,
which is part of an electronic circuit. The
presence of metal causes the frequency of the
signal in the circuit to change, setting up
an audible note in the headphones worn by the
user.
Subject by: Andrew Longhorn