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A comment on "Invisible Electrostatic Wall" at 3M adhesive tape plant (1996). Parent comment

Re:"Invisible Electrostatic Wall" at 3M adhesive tape plant ... by ars on Thursday November 24, 2011 @05:01PM (#3275522)
If there are sparks there is light. A spark is a very wide band transmitter - it creates just about every single frequency of light possible.

See http://en.wikipedia.org/wiki/Spark_gap_transmitter

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