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- 15:41, 17 May 2006 Iantresman talk contribs uploaded File:Plasma-sheath.png (Positive ion sheaths around grid wires in a thermionic gas tube (After Langmuir, 1929). Image by Ian Tresman after, Albert W. Hull and Irving Langmuir, "[http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=522437 Control of an Arc Discharge by Mean)