A Simple Experiment With Earth Currents
This simple and interesting experiment serves to show in some ways the
nature and manner in which earth currents are conducted. Place two wires
20 feet or more in length end to end.
Ground the ends of each wire. In one circuit place a pair of receivers,
in the other place some interrupting device such as a file and needle, as
shown in the sketch. When the needle is scratched along the file it can
be heard in the receivers. The distance between the wires may be
increased to approximately twice their length.
The experiment works best in a northeast to southwest direction as this
is the general direction of most of the earth currents.
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