Electric ears hear secrets in the earth
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Title (Dublin Core)
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Electric ears hear secrets in the earth
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Article Title and/or Image Caption (Dublin Core)
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Title: Electric ears hear secrets in the earth
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extracted text (Extract Text)
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BURIED treasure and un-
dergroundpipe leaksare
Tocated easily by modern
prospectors equipped with
electrical detectors invent-
ed by Gerhard R. Fisher,
of Palo Alto, Calif. The
leak finder utilizes a sen-
sitive crystal microphone
and amplifying tubes to
magnify sound 10,000
times. Carried along the
surface of the ground
above a buried pipe line,
it picks up the faint sound
of escaping liquid or gas.
For finding buried metal
objects, the other device
emits radio waves which
set up an electric field
around any metal that
is a good conductor. This
causes a strong buzz in
the earphones of the op-
erator when the instru-
ment is directly above the
mass of metal. It has been
used for locating flood-
buried tractors and trucks,
recovering lost coins, and
finding hidden veins of
galena. Another use is in
prospecting for pipe lines
under the ground.
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Contributor (Dublin Core)
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Gerhard R. Fisher (inventor)
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Language (Dublin Core)
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Eng
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Date Issued (Dublin Core)
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1941-01
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pages (Bibliographic Ontology)
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90
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Rights (Dublin Core)
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Public domain
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Archived by (Dublin Core)
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Sami Akbiyik
Popular Science Monthly, v. 138, n. 1, 1941
